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ABSTRACT: Spectral and statistical properties of measured vegetation clutter are analyzed for ground-based forward scatter radar (FSR) sensors operating in VHF/UHF bands employing omni-directional antennas. The empirical computer simulation model of vegetation clutter is proposed.
Radar Conference, 2010 IEEE; 06/2010
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ABSTRACT: The work described in this paper is a continuation of previous analytical work that has progressed to an experimental phase. The paper discusses the development of an ultra-wideband (UWB), forward-scatter radar (FSR) system for the detection and (ultimately) automatic recognition of low reflectivity maritime targets. Here we present the concept, developed hardware and selected initial experimental results. A number of novel ideas have been developed to reduce cost, size, prime power requirement, complexity and utilise the advantages of FSR operation. System benefits include increased target cross section (over conventional bi/monostatic radar), increased target detection capability, robustness to stealth targets, decrease in sea clutter effects from synthesis of extremely narrow beams whilst using omni directional antennas and sub-Hertz Doppler frequency measurement capability. The experimental work investigates the use of an UWB FSR fence for security, UWB propagation measurements, UWB sea clutter measurements at very low grazing angles, UWB spectral coverage and the synthesis of narrow beamwidth antennas using forward scatter pulse transmission.
Radar Conference, 2010 IEEE; 06/2010
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ABSTRACT: Preliminary investigation has shown that a chain of buoy based ultra-wideband (UWB) forward scattering radar (FSR) transceivers could potentially be used to overcome clutter problems for the detection of small marine targets on the sea surface. As one stage of a more in depth system investigation, it was deemed that a thorough analysis of the forward scatter radar cross section (RCS) of typical small maritime targets is required for full understanding of the radar system performance. This paper describes the preliminary results of this study, through use of numerically simulated 3-D FS RCSpsilas of complex target models and comparisons with a proposed simplified analytical FS RCS description.
Radar Conference, 2008. EuRAD 2008. European; 12/2008
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ABSTRACT: Detection of body-worn hidden weapons requires improved target resolution. Human being with attached hidden weapon represents multi-target system where weapon as a target in question is masked by human body response. Before application of identification methods it is necessary to resolve composing responses belonging to human and target of interest. Both true time-domain (TD) and frequency domain (FD) representation of responses suffer an ambiguity of signal interpretation when targets are placed close to each other with masking effect. Method of multiple target resolution is suggested based on both TD and FD analysis of equalized signal. UWB short pulse is utilized as an interrogating signal and time-domain responses are measured. Results of TD measurements are presented and signal equalizing calibration procedure is described. Signal processing is based on adaptive filtering algorithms to provide equalization by a reference channel in order to remove any RF system distortion of the received signal. It is shown that combined utilization of calibrated and equalized signals in terms of both power spectrum density (PSD) and TD impulse response enables multi target resolution.
Radar Conference, 2008. EuRAD 2008. European; 12/2008
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ABSTRACT: A scenario for an ultra-wideband (UWB) forward scattering radar (FSR) network for detection of low radar cross section (RCS) maritime surface targets is suggested. A chain of buoys equipped with transceivers which forms a FSR for target detection is considered. In this paper, the first stage of the study is described and major aspects of future work are discussed. It was shown that the high level of surface clutters related to FSR might be reduced by utilisation of UWB technology. As a preliminary further investigation, a numerical simulation of the 3-D RCS for comprehensive models of small maritime targets is obtained and comparisons with simplified target models are made.
Radar, 2008 International Conference on; 10/2008
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ABSTRACT: The progress of the late time response (LTR) method applied to the detection and identification of body-worn hidden weapons has been discussed in [1] and [2]. Efficiency of the target signature extraction and its correct interpretation depend on the system subcomponent characteristics as well as the processing algorithms used. Peculiarities in frequency domain (FD) measurements based on a stepped frequency radar technique introduce an ambiguity in the received signal interpretation. In this paper the real time domain (TD) experimentation system and new instant signal calibration procedure are described. Measurements were made in an anechoic chamber to provide complete signal control. Signal processing is based on adaptive filtering algorithms to provide equalization by a reference channel in order to remove any radio frequency (RF) system distortion of the received signal. A generalized matrix pencil-of-function (MPoF) approach is then applied to retrieve the parameters of LTR.
Radar Conference, 2008. RADAR '08. IEEE; 06/2008
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ABSTRACT: Initial stages of progress in the research on Ultra-Wideband Forward Scattering Radar are presented in this paper. The system's concept and high potential for several practical applications are investigated. kw]Ultra-Wideband radar forward scattering radar
Radar Systems, 2007 IET International Conference on; 11/2007
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H. Rohling,
L Teng,
G Thomas,
D. Flores-Tapia,
S. Pistorius,
M. Cherniakov, M. Gashinova,
Antoniou,
L.Y. Daniel,
C. Hu,
V. Sizov,
M. Trinkle,
D. Gray,
B. Ferguson,
B. Brautigam,
M. Schwerdt,
B. Doring,
A.N. Sharp,
B.D. Bates
Radar Systems, 2007. RADAR 2007. The Institution of Engineering and Technology International Conference on; 11/2007
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ABSTRACT: Presented work is dedicated to the study of innovative principles, which can be used for the remote detection of concealed, body-worn weapons & explosives (CW&E). The approach is based on the analysis of the late time response (LTR) of the human body illuminated by a UWB signal: if CW&E are attached to the body it will essentially influence the LTR characteristics. A set of LTR parameters represents the unique signature of target. Our aim here is to demonstrate the ability of the developed approach to extract and to interpret the signature. In order to validate a feasibility of the approach analytical consideration, full-wave modeling and initial experiment have been implemented and results have been compared
Radar, 2006. CIE '06. International Conference on; 11/2006
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ABSTRACT: The key problem of Forward Scattering Radar (FSR) utilization is the high level of surface clutters. EM wave propagation analysis is used to evaluate the sea clutter level in FSR and a brand new subclass of FSR is proposed, i.e. Ultra Wideband FSR which has essentially higher immunity to sea clutter.
