Exploiting coherent multipath for mainbeam jammer suppression

Kogon, S.M.; Williams, D.B.; Holder, E.J.

doi:10.1049/ip-rsn:19982221

Cited by 19 publications

(16 citation statements)

References 3 publications

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“…When we derive the remaining TSI power and SINR after suppression (Section 4.1) we need (23). In [25] similar calculations as here are performed but only for systems with real valued signals.…”

Section: Covariance Of the Estimatementioning

confidence: 99%

“…where is the power of during TSI suppression filtering, is given in (22), (23) or (28) and is the trace of a square matrix (= the sum of the diagonal elements). Wee see that, is dependent on the jammer power and auxiliary channel noise power at the TSI suppression, the variance of the estimated coefficients and of the strength of the true system.…”

Section: Remaining Tsi Power After Suppressionmentioning

confidence: 99%

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Auxiliary beam terrain‐scattered interference suppression: reflection system and radar performance

Björklund

Nelander

Pettersson

2013

IET Radar, Sonar & Navigation

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Terrain-scattered interference (TSI), i.e. jammer signals reflected on the earth's surface, is a significant problem to military airborne radar. In auxiliary beam TSI suppression the TSI in the main radar beam is estimated by a single or several auxiliary beams and is subtracted from the main beam channel. The signal to subtract is the auxiliary beam signals fed through an estimate of the "reflection system", which describes the scattering on the surface.We first present results on the structure of this TSI suppression, on the estimation of the reflection system and on the quality of the estimate. We then derive theoretical expressions for the SINR (Signal to Interference plus Noise Ratio) and the remaining TSI power for a single auxiliary beam. Since the SINR is directly connected to the radar performance, we can see what factors affect the performance and how. We notice that when the estimated reflection system is missing one or more delays of the true system, the TSI filter cannot suppress the TSI signal completely. This phenomenon, which we call "TSI leakage", has a very large impact on the performance. The SINR cannot be kept constant. Instead, an "SINR improvement" can be defined.

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Section: Covariance Of the Estimatementioning

confidence: 99%

Section: Remaining Tsi Power After Suppressionmentioning

confidence: 99%

Auxiliary beam terrain‐scattered interference suppression: reflection system and radar performance

Björklund

Nelander

Pettersson

2013

IET Radar, Sonar & Navigation

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“…As explained in the previous section, spatial adaptive monopulse processing does not always work well in a mainbeam jamming environment. However, we see from [2,[4][5][6] that space/fast-time (SFT) processing is able to provide substantial improvement in mainbeam jamming interference cancellation when TSI is present in the returns. The objective here is to develop a monopulse processor that employs SFT filtering to enhance angle estimation in much the same way that SFT filtering was employed in Section 2 to enhance interference mitigation.…”

Section: Space-time Adaptive Monopulsementioning

confidence: 99%

“…The operation of this processor is based on the principle that the direct path broadband jammer can be used to predict and, thus, cancel the delayed jammer reflections from the ground (i.e., TSI) present in the mainbeam. Conversely, TSI can be used to estimate and cancel the direct path jammer in the mainbeam [2,[4][5][6]. In the latter case the TSI is in effect used to form a "reference beam" of the jammer, through which the jammer is cancelled.…”

Section: Introductionmentioning

confidence: 99%

A Space/Fast-Time Adaptive Monopulse Technique

Seliktar

Williams

Holder

2006

EURASIP J. Adv. Signal Process.

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Mainbeam jamming poses a particularly difficult challenge for conventional monopulse radars. In such cases spatially adaptive processing provides some interference suppression when the target and jammer are not exactly coaligned. However, as the target angle approaches that of the jammer, mitigation performance is increasingly hampered and distortions are introduced into the resulting beam pattern. Both of these factors limit the reliability of a spatially adaptive monopulse processor. The presence of coherent multipath in the form of terrain-scattered interference (TSI), although normally considered a nuisance, can be exploited to suppress mainbeam jamming with space/fast-time processing. A method is presented offering space/fast-time monopulse processing with distortionless spatial array patterns that can achieve improved angle estimation over spatially adaptive monopulse. Performance results for the monopulse processor are obtained for mountaintop data containing a jammer and TSI, which demonstrate a dramatic improvement in performance over conventional monopulse and spatially adaptive monopulse.

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“…In particular, the "fast-time" STAP architecture is traditionally considered for the specific problem of rejecting diffuse multipath interference, or "hot clutter", which may be received through the main lobe of the antenna pattern [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Time-varying STAP for nonstationary hot clutter cancellation

Fabrizio

Farina

2014

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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This paper addresses the problem of mitigating non-stationary diffusely scattered multipath interference or "hot clutter" by space-time adaptive processing (STAP) in radar systems that use a multi-channel receive antenna array. A computationally efficient time-varying (TV) fast-time STAP algorithm that can effectively cancel hot clutter during the coherent processing interval (CPI) while simultaneously preserving the Doppler spectrum characteristics of the ordinary backscattered "cold clutter" is proposed. The TV-STAP method is compared with several benchmark techniques in a numerical study simulating aircraft and ship detection in over-the-horizon (OTH) radar.

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Exploiting coherent multipath for mainbeam jammer suppression

Cited by 19 publications

References 3 publications

Auxiliary beam terrain‐scattered interference suppression: reflection system and radar performance

Auxiliary beam terrain‐scattered interference suppression: reflection system and radar performance

A Space/Fast-Time Adaptive Monopulse Technique

Time-varying STAP for nonstationary hot clutter cancellation

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