Radar Signals

Levanon, Nadav; Mozeson, E.

doi:10.1002/0471663085

Cited by 1,440 publications

(1,111 citation statements)

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“…This function describes a complex envelope of the signal at the output of the optimal receiver against the echo delay time τ and its Doppler shift f D . Usually it is defined as [11][12][13][14] …”

Section: Doppler-sensitive Signalsmentioning

confidence: 99%

Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals

Lesnik¹,

Serafin²,

Kawalec³

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In the article the problem of the azimuth ambiguity in synthetic aperture radar (SAR) images and its genesis are presented. A method of suppressing the ambiguities by utilization of Doppler-sensitive signals is proposed, and the necessary modifications to the SAR synthesis algorithm are discussed. The SAR system parameters required for an optimal performance of the method are discussed and simulation results are presented.

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Section: Doppler-sensitive Signalsmentioning

confidence: 99%

Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals

Lesnik¹,

Serafin²,

Kawalec³

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…In the case of one multipath component, CAF calculation is the optimal solution for detection. If there exist two or more multipath components separated enough in delay Doppler domain, again, CAF surface offers a very useful detection surface by using properly chosen waveforms for the application of interest [37,[39][40][41][42]. When the phase of each impinging signal on the array is unknown, to detect the multipath clusters on the delay-Doppler domain, absolute values of CAFs at the output of each antenna are calculated and incoherently integrated as:…”

Section: Proposed Pso-caf Techniquementioning

confidence: 99%

“…Detection performance of the cluster locations that exceeds the detection threshold is improved by this way. This practical approach is widely used in radar signal processing and there are excellent references presenting details of the procedure [37,40]. One important principle that should be mentioned at this point is that the uncertainty principle [37].…”

Section: Proposed Pso-caf Techniquementioning

confidence: 99%

“…This practical approach is widely used in radar signal processing and there are excellent references presenting details of the procedure [37,40]. One important principle that should be mentioned at this point is that the uncertainty principle [37]. Briefly, it says that, if one narrow the peak on AF surface to increase the estimator's local accuracy, the volume removed will reappear somewhere away from the peak and will decrease the estimator's global accuracy.…”

Section: Proposed Pso-caf Techniquementioning

confidence: 99%

“…Therefore, type of the waveform determines the accuracy in resolving multipath components and should be chosen based on the interested problem. Maybe the most famous family of phase codes are the Barker codes [37,43,44]. In this paper, as a transmitted signal, s(t), Barker-13 phase coded pulse train is used, which provided us good delay and Doppler resolution for the interested area on the CAF surface.…”

Section: Proposed Pso-caf Techniquementioning

confidence: 99%

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Multipath channel identification by using global optimization in ambiguity function domain

Güldoǧan

Arıkan

2011

Signal Processing

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a b s t r a c tA new transform domain array signal processing technique is proposed for identification of multipath communication channels. The received array element outputs are transformed to delay-Doppler domain by using the cross-ambiguity function (CAF) for efficient exploitation of the delay-Doppler diversity of the multipath components. Clusters of multipath components can be identified by using a simple amplitude thresholding in the delay-Doppler domain. Particle swarm optimization (PSO) can be used to identify parameters of the multipath components in each cluster. The performance of the proposed PSO-CAF technique is compared with the space alternating generalized expectation maximization (SAGE) technique and with a recently proposed PSO based technique at various SNR levels. Simulation results clearly quantify the superior performance of the PSO-CAF technique over the alternative techniques at all practically significant SNR levels.

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Coherent Mimo Radar and Waveform Diversity

Gianelli

Stoica

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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Multiple‐input multiple‐output (MIMO) radar technology has gained considerable attention, from both theorists and practitioners, in the past decade due to its capability to expand radar system functionality and open previously unexplored design space. This work seeks to provide a basic understanding of coherent MIMO radar technology, the performance enhancements that can be attained by using the technology, and the associated drawbacks involved in operating a coherent MIMO radar. Attention is paid to achieve the required waveform orthogonality for a MIMO radar system, and several operating concepts are presented and described. Radar basics are discussed first, followed by a description of the MIMO radar concept. Examples of radar applications that may benefit from the application of MIMO radar are presented. Methods for achieving waveform orthogonality in practical MIMO radar systems are described, and the performance tradeoffs involved in implementing these operation modes are discussed. Information on general radar waveforms, and their suitability for use in a MIMO radar system, is provided. Two examples of MIMO radar systems are discussed, with special emphasis placed on the benefit obtained by applying MIMO radar technology.

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Radar Signals

Cited by 1,440 publications

References 0 publications

Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals

Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals

Multipath channel identification by using global optimization in ambiguity function domain

Coherent Mimo Radar and Waveform Diversity

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