About UWB devices develop Multispectral Solution Inc.

Author:  Dr. Robert J. Fontana  

Pages/Year: 18 /2000

 

In this paper, describe UWB technology development.

Author:  Robert J. Fontana  

Pages/Year: 16 /2000

 

This paper contains a description of UWB, of its relevant characteristics and of its advantages with respect to other technologies for certain communication applications. Some of the techniques used to implement a high capacity, low cost spectrum efficient system, and some of the challenges facing the further development of this new technology, are also described.

Author:  G. Roberto Aiello, Minnie Ho and Jim Lovette  

Pages/Year: 7 /2000

 

It has been suggested that an appropriate figure of merit for a low probability of intercept and detection (LPI/D) waveform is the quantity “Range x Bandwidth / Joule”. That is, the further the range, the wider the bandwidth and the less amount of energy used to achieve these values, the more covert is the resultant communications system.

Author:  Robert J. Fontana  

Pages/Year: 11 /2000

 

It has been suggested that the use of pulse train dithering makes a UWB waveform appear to be "noiselike" to a narrowband receiver. However, a more careful mathematical analysis (cf.Appendix A) shows that this is not the case. At elevated pulse repetition frequencies (PRFs), spectral lines produced by an ultra wideband transmitter will remain the leading cause of interference to narrowband systems, even with appreciable pulse dithering. The potential for such UWB emissions to interfere with sensitive, narrowband systems (e.g., GPS) is real and only aggravated by UWB systems which operate in-band and utilize elevated PRFs.

Author:  Robert J. Fontana  

Pages/Year: 10 /2000

 

The UWB Precision Geolocation System utilizes a set of untethered, fixed position "Beacons" and an untethered mobile "Ranger". Three-dimensional positioning information is obtained by determining the round-trip time-of-flight from the UWB Ranger to each Beacon transponder. The system utilizes a 2.5 nanosecond (27% fractional bandwidth) burst waveform, and an unique tunnel diode receiver which is sensitive to the received pulse leading edge.

Author:  Robert J. Fontana  

Pages/Year: 13 /2000

 

In this paper, present experimental results taken with an ultra wideband precision geolocation system developed to track soldiers inside buildings and in open terrain.

Author:  Robert J. Fontana  

Pages/Year: 9 /2000

 

Aether Wire & Location develop totally integrated transceivers for Position location and Communication (called Localizers)

Author:  Robert Fleming, Cherie Kushner  

Pages/Year: 22 /2000

 

About Rapid UW Signal Acquisition in Localizer. Some slides from "Ultra-Wideband for PicoRadio Networks"

Author:  Robert Fleming, Cherie Kushner  

Pages/Year: 23 /2000

 

Owerview the UWB technology areas for investment and develop.

Author:  Robert Fleming, Cherie Kushner  

Pages/Year: 6 /2000

 

In this paper, we present a laboratory version of ultrawideband (UWB) ground penetrating radar (GPR) system that we developed, as well as data acquired by this system and our 3D visualization method performed on this data. This is a part of work done for the moment at the Royal Military Academy (RMA) in the scope of the Belgian HUDEM 1 project. The main purpose of this on-going work on UWB GPR is to analyze possibilities to detect and visualize buried landmines and other buried objects (false alarms) and therefore to test the ability to distinguish (identify) them.

Author:  N. Milisavljevic, B. Scheers, Y.Yvinec, M. Acheroy  

Pages/Year: 6 /2000

 

The video impulse ground penetrating radar (GPR) system for detection of small and shallow buried objects has been developed. The hardware combines commercially available components with components (e.g. antennas) specially developed or modified for being used in the system. The GPR system has been designed to measure accurately electromagnetic field backscattered from subsurface targets in order to allow identification of detected targets through solution of the inverse scattering problem. The GPR has been tested in different environmental conditions and has proved its ability to detect small and shallow buried targets.

Author:  A.G.Yarovoy, P.van Genderen, L.P.Ligthart  

Pages/Year: 5 /2000

 

We have reached a new level of GPR hardware which combines ultrawide frequency band with a high accuracy of measured signal together with high stability of the whole system. This level of GPR hardware allows us not only to detect small shallow buried targets, but also to determine precisely its position and to approach the problem of target recognition. For the latter we can use SAR images of the objects obtained in different frequency bands, recovered value of target’s dielectric permittivity as well as its polarimetric characteristics.

Author:  Alexander Schukin, Igor Kaploun, Alexander Yarovoy, Leo Ligthart  

Pages/Year: 5 /2000

 

The requirements on GPR technology for the application of humanitarian landmine detection are severe; 99.6% probability of detection and low false alarm rate. Trying to meet these challenging requirements, an impulse radar system has been designed specifically for the application of landmine detection. The radar system contains a dielectric filled TEM horn transmitting antenna and a small loop receiver antenna below the transmitting antenna. With this radar system three-dimensional measurements have been carried out over a test site containing surface-laid and shallowly buried landmines. The test site contains antitank and antipersonnel mines of metal and plastic. In order to show the performance of the new radar system we have to produce images of the subsurface. The imaging algorithms must then be tuned to the specific acquisition parameters. More specific, the refraction of the waves at the surface and the acquisition geometry of the transmitting and receiving antenna influence the arrivaltime of backscattered energy related to subsurface objects. Since imaging algorithms are based on coherent stacking over this energy we must take into account these factors. We produce clear images of landmines and other subsurface objects using adapted imaging algorithms on the data obtained with the new radar system.

Author:  J. Groenenboom  

Pages/Year: 5 /2000

 

Since several years the International Research Centre for Telecommunications-transmission and Radar (IRCTR) is active in the area of developing new GPR systems. Development of a GPR antenna system is impossible without good antenna measurement facilities. Thus three different test sites have been created in IRCTR to perform GPR antenna measurements in time domain. They include an antenna far-field measurement site, a free space near-field scanner and a ground test range.

Author:  A.G.Yarovoy, P. J. Aubry, L.P.Ligthart  

Pages/Year: 4 /2000

 

It is believed that the main breakthrough in GPR hardware can be achieved in the antenna system. Recently three new antenna types have been developed in IRCTR: a dielectric filled TEM horn, a dielectric embedded shielded dipole and a capacitively-loaded bow-tie. Capacitively-loaded bow-tie provides very small ringing and can be used for deep subsurface sounding at low frequencies. The dielectric embedded dipole can be used in high resolution GPR systems providing excellent isolation from external EMI, low-level Tx-Rx coupling and wide antenna pattern in the ground. The dielectric filled TEM horn with its stable performance by different elevation, small footprint in the ground and good matching to both air and the ground can be successfully used in specialized GPR systems, e.g. for landmine etection.

Author:  A.G. Yarovoy, L.P. Ligthart  

Pages/Year: 5 /2000

 

Antennas for impulse Ground Penetrating Radar (GPR) should be designed specially to radiate pulses with given properties into the ground and receive pulses scattered from subsurface objects. Due to their usage in the impulse system, the antenna should be ultra wideband with a linear phase characteristic and with a constant polarization. Despite of the fact that GPR antennas operate near the ground, the antenna performance should be independent from ground properties, which also is a very important demand. One of the best known antennas for radiation of short pulses is the TEM-horn. This antenna may radiate signals over an in ultra-wide frequency band and has a linear phase characteristic over this band. However attempts to use this antenna in GPR systems for radiating into the ground were not successful when the antenna were situated close to the ground. The reason for this failure is that the basic TEM-horn is not matched to the ground and the ground reflection causes strong late time ringing. Besides the basic TEM horn antenna has large physical dimensions. To overcome these disadvantages a dielectric filled TEM horn antenna has been developed and has been measured as a single antenna and as a part of a Tx-Rx GPR system.

Author:  A.G.Yarovoy, A.D. Schukin, L.P.Ligthart  

Pages/Year: 4 /2000

 

In this paper a concept in designing an adaptive antenna for ground penetrating radar is presented along with its preliminary simulation results. The antenna considered is an array of wire dipoles arranged to form a wire bow-tie antenna. The input impedance of bow-tie antennas is known to be dependent mostly on their flare angle. For antennas situated on the ground, maximal radiation into the ground can be obtained if their input impedance is optimized with respect to the ground impedance. Bow-tie antennas can therefore be optimized to radiate maximum power into a certain type of ground by adjusting their flare angle. In a first approach, without matching the antenna to feeding line, it is found numerically that there exists a certain angle at which this antenna radiates maximal power into the ground for all types of ground. In this case, adaptation to the ground by varying flare angle is still not fully realized. In our future research, another approach will be used, in which the antenna is matched to the feeding line within the whole spectrum of input pulse in order to obtain a more effective adaptation to the ground.

Author:  A.A. Lestari, A.G. Yarovoy, L.P. Ligthart  

Pages/Year: 6 /2000

 

A number of applications, among which is ground penetrating radar (GPR), generally make use of pulses which are short in duration, especially when targets of interest are electrically small (e.g. anti-personnel landmines). The transmitted pulses should have a simple shape such as a monopulse, a monocycle or their time-derivatives, and their tails should be sufficiently flat to avoid masking of the targets. As high detection rate and low false alarm rate are crucial aspects in GPRs for buried landmine detection, the antenna should be able to radiate efficiently to allow optimal ground penetration. Many GPRs for demining of landmines are designed to be carried by an operator, and hence the antenna system should also be light-weight. Furthermore, demining operations in mine fields can be very expensive because they usually involve vast areas and deployment of many deminers. The GPR should therefore be affordable for such operations and correspondingly low-cost antennas become a necessity. Those mentioned factors are considered as the design criteria for the GPR antenna reported here, i.e., radiating short pulses with a flat tail, possesses good radiation efficiency, light-weight and low-cost.

Author:  A.A. Lestari, A.G. Yarovoy, L.P. Ligthart  

Pages/Year: 4 /2000

 

Achieving range accuracy with a variety of missile target cross-sections and agility, quick response and platform immunity places extreme demands on conventional radar systems. The innovative solution embodied in the ARMS system utilises impulse radar to meet these requirements.

Author:  None  

Pages/Year: 10 /2000

 

Low cost airborne radar sensor unit with telemetry and optional encryptor

Author:  None  

Pages/Year: 6 /2000

 

Cambridge Consultants Limited (CCL®) carried out the design, construction and field trials for a helicopter-mounted impulse radar system for measuring the thickness of Arctic sea ice around oil installations. Completed to a tight time schedule, the system is fully flight qualified, meets EMC requirements, and provides a twenty-fold increase in productivity in a hostile environment.

Author:  None  

Pages/Year: 1 /2000

 

Broadband radar has the potential to be applied to a number of automotive sensing problems including occupant sensing for airbag applications, in-vehicle security sensing, reversing/parking aids and short- to medium-range collision avoidance.

Author:  None  

Pages/Year: 1 /2000

 

Pulse Radio has been considered a power efficient method for communication in a multiple path fading environment. We extend the method to the use of multiple transmitters per user, and the use of receiver arrays distributed over a geographic area. We show that we can obtain a linear growth in transmission capacity if we use multiple receivers. We explore thee notion of spatial capacity, similar to the earlier results for point-to-poitn communications with multiple antenna elements (MAE).

Author:  Joseph Y.Hui  

Pages/Year: 5 /2000

 

AEther Wire has developed a position location and communication system which overcomes the limitations that make other location systems unsuitable for most imagined applications.

Author:  None  

Pages/Year: 4 /1999

 

About geolocation system called Localizer. Slides from Ultra-Wideband Conference at 28 September 1999

Author:  Robert Fleming, Cherie Kushner  

Pages/Year: 19 /1999

 

This paper contains a few important points of UWB technology : definition of UWB, measurement technique, peak limit of power,power spectral density and other. The appendix include an articles: "Test Results & Theoretical Analysis of Compatibility between a Global Positioning System and Time-Modulated Ultra-Wideband Emissions", "Cumulative Impact of TM-UWB Devices & Affect on Three Aviation Receivers", "Example UWB Emissions from Incidental, Unintentional, and Intentional Devices"

Author:  none  

Pages/Year: 92 /1999

 

The video impulse system ground penetrating radar system for detection of small and shallow buried objects has been developed. The hardware combines commercially available components with components (e.g. antennas) specially developed or modified for being used in the system. Antenna system has been designed so that it provides sufficient spatial resolution and power budget together with small coupling and ringing. The GPR has been tested in different environmental conditions and has proved its ability to detect small and shallow buried targets.

Author:  A.G. Yarovoy, B.Sai, G.Hermans, P.van Genderen, L.P.Ligthart, A.D.Schukin, I.V.Kaploun  

Pages/Year: 4 /1999

 

In this paper we will present and discuss the design and material characterization of a small scale test environment. Then indicate some inherent limitations on such a small test site and outline one simple remedy to suppress near- eld e ects and environmental clutter. Once the test environment ischaracterized a Stepped Frequency Ground Penetrating Radar is implemented using a Vector Network Analyser and used to critically investigate the performance advantages and limitations of a TEM horn and a standard gain horn used either in a monostatic mode or as part of a new bistatic con guration. This work demonstrated the standard gain horn in a bistatic con guration to be a more e ective combination for detection of shallow and surface laid buried objects.

Author:  A. Snip, I.L. Morrow, P. van Genderen  

Pages/Year: 4 /1999

 

In 1989, a VHF SAR was constructed for the purpose of looking through foliage and imaging man-made objects such as roads and buildings. Immediately, some of the problems in designing and operating an airborne SAR at these frequencies became apparent, and the remainder of this paper will comment on the design and applications of airborne VHF/UHF SAR systems.

Author:  Roger S Vickers  

Pages/Year: 7 /1999

 

Wideband radar technology has the greatest benefits to offer for many applications, and will meet cost targets.

Author:  G K A Oswald  

Pages/Year: 20 /1999

 

Communication Applications of UWB technology.Slides from UWB Conference at September 28, 1999

Author:  Debby Hindus  

Pages/Year: 10 /1999

 

TM-UWB technolologe develop in Time Domain Inc.

Author:  none  

Pages/Year: 23 /1999

 

Overwiev of UWB GPR radar. More applications and very interisting for first step.

Author:  Gary R. Olhoeft  

Pages/Year: 13 /1999

 

Time modulated ultra-wideband (TM-UWB) techniques allow the transmission and fully coherent reception of RF signals with very large fractional bandwidths for a wide variety of important applications. However, traditional instrumentation (e.g., spectrum analyzers) cannot be used at meaningful distances to measure the channel response for such signals. Without such measurements it has been impossible to create channel models except in a few simple cases. Now a TM-UWB scanning receiver has been constructed that allows precision measurement of the impulse response of the channel where measurements can be made out to the maximum communications range of the system. This versatile system not only captures ultra-wideband propagation waveforms, but information on data symbol statistics.

Author:  P. Withington, R. Reinhardt, and R. Stanley  

Pages/Year: 5 /1999

 

A general high-Q biquad lter architecture capable of operating in the GHz range is proposed and analyzed. This lter, which is usable in bandpass and lowpass applications, utilizes two e ective Q-enhancement techniques to circumvent the low-Q characteristics inherent in the circuit. Simulation results employing standard 0.5 m CMOS technology have successfully veri ed that the center frequency tuning and hybrid Q-tuning techniques operate between 1GHz to 2.3GHz center frequencies with Q ranging from 4.8 to over 1000. A tunable bandpass lter with a center frequency at 1.5GHz and a lowpass lter with a center frequency at 2.07GHz each having Q equal to 31 have been designed to have 63dB and 44dB input dynamic range, and power dissipation equal to 30.5mW and 27.8mW, respectively.

Author:  Yuyu Chang John Choma, Jr.Jack Wills  

Pages/Year: 4 /1999

 

This article about UltRa Lab. The electrical engineer Robert Scholtz is exploring the next digital technology that could revolutionize life: ultra-wide bandwidth radio, including short-pulse radio or impulse radio.

Author:  USC Chronicle  

Pages/Year: 4 /1999

 

The Chief of the Commission's Office of Engineering and Technology, on delegated authority, has granted waivers of certain Part 15 rules to Time Domain Corporation, U.S.Radar Inc., and Zircon Corporation to allow the limited marketing of ultra-wide band ("UWB") devices, subject to certain conditions.

Author:  none  

Pages/Year: 2 /1999

 

Janes International Defencse Review 2/1999 (Text only version)

Author:  Mark Hewish and Scott R. Gourley  

Pages/Year: 2 /1999

 

Janes International Defencse Review 2/1999

Author:  Mark Hewish and Scott R. Gourley  

Pages/Year: 3 /1999

 

Abstract|We study the problem of rate control for transmission of video over burst-error wireless channels, i.e.,channels such that errors tend to occur in clusters during fading periods. In particular we consider a scenario consisting of packet based transmission with Automatic Repeat reQuest (ARQ) error control and a back channel. We start by showing how the delay constraints in real time video transmission can be translated into rate constraints at the encoder, where the applicable rate constraints at a given time depend on future channel rates. With the acknowledgments received through the back channel we have an estimate of the current channel state. This information, combined with an a priori model of the channel allow usto statistically model the future channel rates. Thus the rate constraints at the encoder can be expressed in terms of the expected channel behavior. We can then formalize a rate distortion optimization problem, namely, that of assigning quantizers to each of the video blocks stored in the encoder bu er such that the quality ofthe received video is maximized. This requires that the rate constraints be included in the optimization, since violating a rate constraint is equivalent to violating a delay constraint and thus results in losing a video block. We formalize two possible approaches. The rst one seeks to minimize the distortion for the expected rate constraints given the channel model and current observation. The second approach seeks to allocate bits so as to minimize the expected distortion for the given model. We use both dynamic programming and Lagrangian optimization approaches to solve these problems. Our simulation results demonstrate that both the video distortion at the decoder and packet loss rate can be signi cantly reduced when incorporating the channel information provided by the feedback channel and the a priori model into the rate control algorithm.

Author:  Chi-Yuan Hsu, Antonio Ortega, and Masoud Khansari  

Pages/Year: 18 /1999

 

Question from Bob Lucky responses R.Scholtz.

Author:  Robert Scholtz  

Pages/Year: 8 /1999

 

The weekly newspaper for the wireless communications industry

Author:  none  

Pages/Year: 1 /1999

 

The article from TechWeek. More than a pipe dream, a new technology could revolutionize wireless communications…

Author:  Amara D. Angelica  

Pages/Year: 4 /1999

 

Ultra wideband radios could give today™s technologies a run for the money kb/s per user

Author:  NANCY GOHRING  

Pages/Year: 1 /1999

 

A time-hopping modulation format employing impulse signal technology has several features which may make it attractive for multiple-access communications. These features are outlined, an estimate of the multiple-access capability of a communication system employing this format under ideal propagation conditions is presented, and emerging design issues are described.

Author:  R. A. Scholtz  

Pages/Year: 4 /1999

 

A report from TR Daily

Author:  none  

Pages/Year: 1 /1999

 

One of the potential benefits of the UWB radio is its multipath resolution. The implications are multipath components which might not be resolved as distinct arrivals in more narrowband systems, may be separately identified in UWB systems. This paper explores some of the propagation characteristics associated with UWB signals, based on measured data.

Author:  J. M. Cramer, R. A.  Scholtz and M. Z. Win  

Pages/Year: 5 /1999

 

By this Notice of Inquiry, the Commission is initiating a proceeding to investigate the possibility of permitting the operation of ultra-wideband (UWB) radio systems on an unlicensed basis under its rules. Comments are requested on the standards and operating requirements that should be applied to UWB systems to prevent interference to other radio services.

Author:  none  

Pages/Year: 2 /1999

 

This paper pertains to the design aspects of a multifrequency FMCW radar with emphasis on the engineering problems involved in its implementation. This radar generates 8 separate FMCW signals which are then additively mixed and radiated. The ultimate objectives of the radar are multiple : n to study waveforms of variable and flexible transmitted power spectra. n to study ultra- wide band processing techniques, without the need to have an ultra-wide instantaneous bandwidth. n to study coherent, non- coherent and mixed processing concepts. The multifrequency FMCW radar under discussion in this paper has been called the PANDORA. This is an acronym for Parallel Array for Numerous Different Operational Research Activities. Essentially, we are trying to achieve ultra- wide band capability using multiple narrow band FMCW radars ( in our specific case 8 radars corresponding to 8 channels) operating simultaneously. This allows us to study UWB processing techniques without the need for an ultra- wide instantaneous bandwidth. This automatically implies that we have the capability to study coherent, non- coherent and mixed processing concepts in an ultra- wide band environment using narrow band FMCW radars.

Author:  M.Jankiraman , B.J. Wessels , P. van Genderen  

Pages/Year: 6 /1999

 

Spring 1999 Inside This Issue Powering Up Pre Navy s Advanced Rapid COTS Insertion program, designed Lanscape handles pre-press for virtually brain attack protocol that doesn t Manufacturers have recog- nized patient comfort Mercury s unique RACEway architecture, which United Kingdom s Defense Evaluation and Research Agency (DERA) are range sensors using Ultra Wide Band (UWB) radar

Author:  none  

Pages/Year: 16 /1999

 

This paper is continue of "System Design and Verification of the Pandora Multifrequency Radar"

Author:  M.Jankiraman , B.J. Wessels , P. van Genderen  

Pages/Year: 6 /1999

 

DRH- 0532 double- ridged horn antenna is linearly polarized and operates over a frequency range of 0.5 to 3.2 GHz. This antenna has gain, bandwidth, and power handling characteristics which are ideal for EW and EMI susceptibility testing, and can replace numerous separate antennas in laboratory and field applications. Unlike log- periodic or spiral antennas, the DRH- 0532 has low dispersion when used with short pulse signals. This characte-ristic combined with a wide instantaneous bandwidth, excellent power handling, and relatively large power gain makes these antennas ideal for ultra- wide- band (UWB) radar and imaging applications. Example: DRH- 0532 specifies a 0.5 to 3.2 GHz antenna with the standard type- N connector Typical Antenna Patterns, Model DRH- 0532

Author:  none  

Pages/Year: 2 /1999

 

This is an informal report intended primarily for internal or limited external distribution. The opinionsand onclusions stated are thoseof theauthorand may or may not be those of the Laboratory. Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.

Author:  J. Mast, S. Azevedo, W. Haddad,
L. Ng, G. Burnett  

Pages/Year: 14 /1998

 

A full-wave model is developed for electromagnetic scattering from buried and surface land mines (both conducting and plastic), taking rigorous account of the lossy, dispersive and potentially layered properties of soil. The (polarimetric) theoretical results are confirmed via synthetic aperture radar (SAR) measurements, performed using the US Army Research Laboratory’s BoomSAR, with which fully polarimetric ultra-wideband (50-1200 MHz) SAR imagery is produced. The SAR system is used to acquire a large data base of imagery, including a significant distribution of naturally occurring clutter. Several techniques are used for mine detection with such data, including several detectors which are based on target features gleaned from the modeling, as well as a matched-filter-like detector that directly incorporates the target signatures themselves. In addition, the theoretical model is used to predict wave phenomenology in various environments (beyond the limited range of parameters that can be examined experimentally). Since the efficacy of radar-based subsurface sensing depends strongly on the soil properties, we perform a parametric study of the dependence of such on the target RCS and on possible and-mine resonances. (Sorry, w/o pictures ONLY TEXT)

Author:  Lawrence Carin, Norbert Geng and Mark McClure  

Pages/Year: 29 /1998

 

About breadboarded, amateur version, working somewhere near 800 MHz, was devel-oped (just to see the magic in it) at the University of Rome “La Sapienza” in a col-laboration between the Centre for Biomedical Engineering and the Electronic En-gineering Dept. of the same University.

Author:  Enrico M. Staderini  

Pages/Year: 13 /1998

 

This paper describes the design and development of the ultra wideband ensor, as well as performance results achieved during field testing at NSWC’s Dahlgren, VA facility. These results are compared with those achieved with a high resolution EHF radar and a laser-based detection system.

Author:  R. J. Fontana, J. F. Larrick, J. E. Cade & E. P. Rivers  

Pages/Year: 9 /1998

 

Time Domain Corporation has developed highly beneficial products using its time modulated ultra-wideband (“TM-UWB”) technology.

Author:  none  

Pages/Year: 46 /1998

 

TEM Innovations is a technology generation firm headed by the inventor of Micropower Impulse Radar (MIR). MIR is a low-cost UWB impulse technology that has attracted over 5000 inquiries and has been licensed to dozens of companies by Lawrence Livermore National Laboratory. Wideband (WB) pulsed-RF sensors currently in development at TEM Innovations are also generating the same high level of interest.

Author:  Thomas E. McEwan  

Pages/Year: 15 /1998

 

Owerview of UWB technology.Ultra-wideband (“UWB”) technologies can save lives, protect property, and provide for more effective uses of radio in a variety of applications that largely involve short range low power operations. Many of these are not feasible without UWB; others can be enhanced greatly by the use of UWB.

Author:  none  

Pages/Year: 22 /1998

 

The ExtremeSpectrum is telecommunication company currently engaged in development UWB communication device. In this paper, company write about UWB transmission system.

Author:  none  

Pages/Year: 13 /1998

 

This paper describes some works, being carried out in the IRCTR, focused on landmine detection by using an ultra-wideband (UWB) impulse Ground Penetrating Radar (GPR). In landmine detection, a ground penetrating radar has to deal with multiple, lossy, probably inhomogeneous medium problems, and its performance is associated with the properties of local soil and buried targets, implementation of its hardware and software. It is more significant for a carrierless video pulse radar to use the term, peak power, in a sense of detection of buried targets. Concerning reflected signal levels, the contrast of electromagnetic characteristics between a buried landmine and its surrounding soil is of utmost importance. The analysis shows that a minimum discernable signal (MDS) being approximately as low as -100 dB below the transmitted peak power of a GPR system is demanded so that signals scattered from various non-metallic landmines buried in a variety of typical grounds can be detected by radar. This is of great difficulty for conventional time-domain impulse radar system to achieve such a goal. Improvements and modifications are necessarily needed specially for GPR landmine detection. We discuss the various key factors within this problem which can yield results worthy of being used in system design/configuration by means of a far-field, two-medium approach.

Author:  B. Sai, I. Morrow, P. van Genderen  

Pages/Year: 5 /1998

 

Impulse radio,a formofultra-wideband-width(UWB)spread spectrum signaling,has properties that make it aviable candidate for short range communication sindense multipath environments.This letter describes the characteristics of impulse radio using a modulation for matthat can be supported by currently available impulse signal technology and gives analytical estimate sofits multiple access capability under ideal multiple access channel conditions.

Author:  Moe Z. Win, Robert A. Scholtz  

Pages/Year: 3 /1998

 

In this paper we describe di erent block waveform pulse-position-modulated (PPM) signal sets constructed using impulse technology. In each case the design method is given, the normalized correlation properties are discussed, the performance in additive white Gaussian noise (AWGN) is analyzed, and receiver simplication for large signal sets is illustrated.

Author:  Fernando Ram  rez-Mireles and  Robert A. Scholtz  

Pages/Year: 4 /1998

 

In this paper we analyze the performance of spread spectrum multiple-access (MA) using time hopping (TH) and pulse position modulation (PPM) in combination with impulse technology. For di erent block waveform (PPM) signal design, the multiple-access performance is analyzed in terms of the number of users supported by the system for a given bit error rate, bit transmission rate, and number of signals in the block waveform set.

Author:  Fernando Ram  rez-Mireles and  Robert A. Scholtz  

Pages/Year: 4 /1998

 

The results of an ultra -wide bandwidth (UWB) signal propagation experiment, using the bandwidth in excess of one GHz, performed in a typical modern o±ce building are presented. Robustness of the UWB signal in multipath is quanti?ed through cumulative distribution functions of the signal quality in various locations of the building. The results show that UWB signal does not su®er multipath fading.

Author:  Moe Z. Win  

Pages/Year: 3 /1998

 

In this paper we study M-ary time-shift-keyed signal sets constructed using impulse technology. For the equicorrelated signals case the construction method is given, the correlation properties are discussed, the performance in additive white Gaussian noise is analyzed, and receiver simpli cation is illustrated.

Author:  Fernando Ram  rez-Mireles and Robert A. Scholtz  

Pages/Year: 5 /1998

 

….Use of ultrawideband technologies could enhance aviation safety by providing improved ground security and location capabilities… (The article from AVIATION WEEK & SPACE TECHNOLOGY/DECEMBER 14,1998)

Author:  WILLIAM B. SCOTT, PALO ALTO  

Pages/Year: 2 /1998

 

The use of time-hopped block waveform encoding PPM signals sets for multiple access communications is studied. The multiple access performance is analyzed in terms of the number of users supported by the system for a given bit error rate and bit transmission rate. The analysis shows that this technique is potentially able to provide multiple-access communications with a combined transmission capacity of over 500 Megabits per second at bit error rates in the range10.

Author:  Fernando Ram  rez-Mireles and Robert A. Scholtz  

Pages/Year: 5 /1998

 

The use of spread spectrum time hopping in combination with pulse position modulation for multiple access communications is studied. The multiple access performance is described in terms of the number of users supported by the system for a given bit error rate and bit transmission rate. Expressions for the maximum number of users and maximum transmission capacity in bits per second are found. Asymptotic values for these quantities are derived.

Author:  Fernando Ram  rez-Mireles and Robert A. Scholtz  

Pages/Year: 5 /1998

 

Known variously as ultra-wide-band radio and digital pulse wireless, the new technology has a broad range of possible applications, from wireless voice and high-speed data communications to land mine detection and advanced radar systems that could permit law officers to see through walls or could aid cars in avoiding collisions.

Author:  JOHN MARKOFF  

Pages/Year: 4 /1998

 

The article reprinting from NewYork Times

Author:  JOHN MARKOFF  

Pages/Year: 2 /1998

 

A nowel application of the Clean algorithm is proposed to characterize ultra-wideband communication channels from measured data.

Author:  Robert Scholtz  

Pages/Year: 5 /1998

 

In order to estimate performance of impulse radio communication system, a characterization of the channel is required. In particular, knowledge of the multiparth angle and time-of-arrival distributions is useful for predicting the performance of diversity reception sheemes.

Author:  Fernando Ram  rez-Mireles and Robert A. Scholtz  

Pages/Year: 5 /1998

 

The remainder of the signal is then transformed by use of a numerical FFT. We demonstrate that it is possible to construct functions that possess analytical inverse transforms and also asymptotically model the low- and high- frequency behavior of a field propagating in a single- resonance Lorentz medium. In this paper we develop a hybrid analytical numerical technique whereby analytical techniques are used in con-junction with a numerical FFT to address the problem of UWB pulse propagation in a homogeneous, single-resonance Lorentz medium.

Author:  S. L. Dvorak and R. W. Ziolkowski  

Pages/Year: 15 /1998

 

The remainder of the signal is then transformed by use of a numerical FFT. We demonstrate that it is possible to construct functions that possess analytical inverse transforms and also asymptotically model the low- and high- frequency behavior of a field propagating in a single- resonance Lorentz medium. In this paper we develop a hybrid analytical numerical technique whereby analytical techniques are used in con-junction with a numerical FFT to address the problem of UWB pulse propagation in a homogeneous, single-resonance Lorentz medium.

Author:  John Benway  

Pages/Year: 9 /1998

 

Sadly I must report that although I live in one of the technologically richest counties in this country, the best (affordable) access I can achieve from my residence is via a 56kbps modem. Permitting the rule changes that will allow for UWB spread spectrum will dramatically increase the odds that myself and others across the nation will be able to achieve affordable last mile connectivity. Consumers have been waiting for too long for the Telecommunications monopolies (Baby Bells) to deliver on the stated promise of affordable access. Cable modems offer tremendous promise, but many cable operators are too hesitant to invest in the infrastructure and upgrades required in their cable plants to allow for high speed bidirectional access. Likewise, the cable operators are traditional monopolies and work with the rapidity that is expected from a monopoly. UWB Spread Spectrum is the only logical last mile choice that will make it truly affordable and available to consumers. The promise of high speed access today is only delivered based upon a random process of where you live and what services are in place at the moment. UWB Spread Spectrum could represent that choice.

Author:  Paul Werner  

Pages/Year: 1 /1998

 

This paper describes the design and performance characteristics of recently developed UWB transceivers which can be used for the LPI/D transmission of digital voice, data and high resolution video imagery.

Author:  Robert J Fontana, J Fred Larrick, Jeffrey E Cade  

Pages/Year: 6 /1997

 

Impulse radio, a form of ultra-wide band signaling, has properties that make it a viable candidate for short range communications in dense multipath environments. This paper describes the characteristics of impulse radio, gives analytical estimates of its multiple access capability, and presents propagation test results and their implications for the design of the radio receiver.

Author:  R.A. Scholtz  

Pages/Year: 24 /1997

 

Attractive features of time-hopping spread-spectrum multiple access systems employing impulse signal technology are outlined and emerging design issues are described. Performance of such communications systems in terms of multiple-access capability is estimated for both analog and digital data modulation formats under ideal multiple access channel conditions.

Author:    

Pages/Year: 5 /1997

 

Abstract|An ultra -wide bandwidth (UWB) signal propagation experiment is performed in a typical modern o±ce building in order to characterize the UWB signal propagation channel. The bandwidth of the signal used in this experiment is in excess of one GHz. Robustness of the UWB signal to fades is quanti?ed through histograms and cumulative distributions of the signal quality in various locations of the building. The results show that UWB signal does not surer fades.

Author:  Moe Z. Win and Robert A. Scholtz  

Pages/Year: 5 /1997

 

Abstract| Personal Communications System (PCS) promises to provide a variety of information exchanges among users with any type of mobility, at any time, in any place, through any available device. To achieve this ambitious goal, two of the major challenges in the system design are: (i) to provide a high speed wireless subsystem with large capacity and acceptable Quality of Service (QoS); and (ii) to design a network architecture capable of supporting the multimedia trafic and various kinds of user mobility. A novel time-hopping spread-spectrum wireless communication system called Ultra-Wide Bandwidth (UWB) radio is employed to provide low power, high data rate, fade-free, and relatively shadow-free communications in a dense multipath environment. Performance of such communications systems in terms of multiple-access capability is estimated for digital data modulation formats under ideal multiple access channel conditions. In our work, an Asynchronous Transfer Mode (ATM) network is used as the backbone network for PCS due to its high bandwidth, fast switching capability, °exibility, and well developed infrastructure. To minimize the impact caused by user mobility on the system performance, a hierarchical network control architecture is postulated. A wireless virtual circuit (WVC) concept is proposed to improve the transmission eficiency and simplify the network control in the wireless subsystem. The key advantage of this network architecture and WVC concept is that the hando® can be done locally most of the time due to the localization behavior of PCS users. The results of UWB signal propagation experiment demonstrate the feasibility of the UWB radio, its robustness in the multipath environment, and its potential to support multimedia trafic.

Author:  Moe Z. Win, Ji-Her Ju, Xiaoxin Qiu, Victor O. K. Li, and Robert A. Scholtz  

Pages/Year: 8 /1997

 

|In this paper we investigate communications using quaternary pulse position data modulation over the indoor impulse radio multiple access channel disturbed with multipath. The performance of four quaternary signal sets with diferent correlation properties is assessed.

Author:  Fernando Ram  rez-Mireles, Moe Z. Win, and Robert A. Scholtz  

Pages/Year: 3 /1997

 

N-orthogonal signal set consists of M = NL equal energy, equal time duration signals that have the following two properties: (1) The signal set may be divided into L disjoint subsets, each subset containing N signals, and (2) Signals from di erent subsets are orthogonal. In this paper we describe the construction of N-orthogonal sets when L is a positive integer, using Multiple-Time-Shift-Keyed modulation. This signals are of interest in the Impulse Radio Channel, where the communication waveforms convey information exclusively in the time shift values and consist of trains of time-shifted ultra-narrow pulses.

Author:  Fernando Ram  rez-Mireles and Robert A. Scholtz  

Pages/Year: 4 /1997

 

Impulse radio (IR) is a spread spectrum (SS) wireless technique in which ultra- wideband (UWB) communication waveforms that consist of trains of time- shifted sub-nanosecond pulses are modulated to convey information exclusively in the relative time position of the pulses. In this paper we make an assessment of the performance of non-binary IR modulation in the presence of multipath with detection using a Rake receiver.

Author:  Fernando Ram  rez-Mireles, Moe Z. Win, and Robert A. Scholtz  

Pages/Year: 5 /1997

 

A new pocket-size radar that operates up to several years on AA batteries and costs only a few dollars is stimulating Laboratory research efforts and a variety of industrial products. Its many potential uses include security, rescue operations, and health monitoring.

Author:  THOMAS E. MCEWAN  

Pages/Year: 11 /1996

 

The Army Research Laboratory (ARL) is executing technology development programs to evaluate the potential use of ultra-wideband synthetic aperture radar (UWB SAR) technology to detect and classify targets concealed by foliage and subsurface targets. Under these programs, a very capable, 1-GHz-bandwidth, low-frequency, fully polarimetric, UWB SAR instrumentation system was developed to collect the data needed to support the penetrating radar studies. This paper describes two foliage and ground penetrating radar experiments conducted with this radar.

Author:  Karl A. Kappra, Francis Le, Lam Nguyen, Tuan Ton, Matthew Bennett  

Pages/Year: 5 /1996

 

This paper evaluates propagation data taken in the summer of 1995 in an office building. The source of RF energy was a sub-two-nanosecond pulse, that was transmitted at a PRF of 2 mega-pulses per second. Data was recorded with a high speed sampling oscilloscope at approximately 50 ps intervals over a time span of 300 ns. The purpose of this paper is to disseminate some simple and preliminary evaluations, thereby, stimulating discussion among interested engineers.

Author:  Paul Withington  

Pages/Year: 17 /1996

 

A time-hopping spread-spectrum communication system employing impulse signal technology has several features which may make it attractive for multiple access communications. These features are outlined and emerging design issues are described. Under ideal propagation conditions, multiple-access capability is estimated for such a communications system with analog frequency shift keyed modulations.

Author:  Moe Z. Win, Robert A. Scholtz, and Larry W. Fullerton  

Pages/Year: 6 /1996

 

A time-hopping modulation format employing impulsee signal technology has several features which may make it attractive for multiple-access communications. These features are outlined, an estimate of the multiple-access capability of a communication system employing this format under ideal propagation conditions is presented, and emerging design issues are described.

Author:  R.A. Scholtz  

Pages/Year: 5 /1993

 

The Defence Advanced Research Project Agency (DAPRA) and the Office of the Secretary of Defence (OSD) tasked Battelle to review UWB technologies and applications.

Author:  Charles Fowler, John Entzminger, James Corum  

Pages/Year: 5 /1990

 

from IEEE Transactions on Electromagnetic Compatibility, Feb. 1984. See article "Antenna of Nonsinusoidal Waves. I.Radiator"

Author:  Juan A Morente, Rafael Gomez  

Pages/Year: 1 /1984

 

from article "Antennas and Waveguides for Nonsinusoidal Waves"

Author:  Henning F. Harmuth  

Pages/Year: 44 /1984

 

During the last years numerous application of nonsinosoidal electromagnetic waves have been discussed in this paper.

Author:  Henning F. Harmuth  

Pages/Year: 12 /1983

 

The use of basic large-current radiator - discussed in a previous paper - and the Hertzian electric dipole as sensor is investigated. If the sensor work into a large resistive load, typically implemented by an emmitter follower, its output voltage varies like the electric field strength, while a capacitive load produce an output voltage proportionate to the integral of field strength.

Author:  Henning F. Harmuth, Shao Ding-Rong  

Pages/Year: 9 /1983

 

During the last few years a considerable amount of work has gone into the study of applications of radio signals that do not use the conventional sinusoidal carrier.

Author:  Henning F. Harmuth, Shao Ding-rong  

Pages/Year: 4 /1983

 

Introduction at Nonsinusoidal Waves for Radar and Radio Communication system. This article describe other aspect of nonsinusoidal technics.

Author:  Henning F. Harmuth  

Pages/Year: 43 /1981

 

The purpose of this paper is to introduce the reader to elements of time-domain electromagnetics, which include UWB technology and target-signature analysis.

Author:  C. LEONARD BENNETT, GERALD F. ROSS  

Pages/Year: 21 /1978

 

We demonstrate in this paper that the band-limiting constraints of radiating system limit emmission of the low-frequency spectral components of such waveforms and severely restrice the radiation directivity that may be achived in systems that emloy them. We also find that dispersion in the propagating medium poses difficulties for the use of such waveforms, and we present an examle that illustrates their impracticality in a case in which medium-related limits on coherence band-widt are of concern.

Author:  J.R.Davis  

Pages/Year: 8 /1967