Multichannel Coprime SAR/GMTI (CopGMTI)

Aldharrab, Abdulmalik; Davies, Mike E.

doi:10.1109/radar42522.2020.9114845

Cited by 2 publications

(1 citation statement)

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“…Moreover, one of the desirable applications of SCopSAR is for the case of imaging at a large incidence angle since, in such a scenario, the antenna beam-pattern is not as useful in rejecting the scatterers at the far range which may introduce range ambiguities. An interesting future research direction would be in exploring the use of the proposed SCopSAR sampling strategy to allow for range swath extension in SAR based Ground Moving Target Indication (GMTI) in a similar manner to the recently proposed CopGMTI [26]. Moreover, SCopSAR uses only half the synthetic aperture to produce each sub-Nyquist image which results in a loss of half the azimuth resolution.…”

Section: Experiments Using Real Ers-2 Raw Datamentioning

confidence: 99%

Staggered Coprime Pulse Repetition Frequencies Synthetic Aperture Radar (SCopSAR)

Aldharrab

Davies

2022

IEEE Trans. Geosci. Remote Sensing

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High-Resolution Wide-Swath Synthetic Aperture Radar (HRWS-SAR) imaging is highly desirable since it allows one to produce high-resolution SAR images of large areas during a short visit time. In this paper, Staggered Coprime Pulse Repetition Frequencies Synthetic Aperture Radar (SCopSAR) is proposed. It divides the time during which a scatterer is illuminated by the antenna beam-pattern into two halves where, in each half, pulses are transmitted at the rate of one of two sub-Nyquist Pulse Repetition Frequencies (PRFs). Such PRFs are related to the Nyquist PRF using two coprime sub-sampling factors. This allows extending the maximum range swath width that can be imaged by a number of times that equals the smaller sub-sampling factor at the expense of a reduction in the azimuth resolution by half. It further allows for a reduction in the amount of data to be stored and communicated. SCopSAR is an imaging modality suitable for scenes that contain a small number of bright scatterers over a dark background which, for instance, is the case when imaging ships in a calm sea background. Compared to the techniques recently proposed in the literature, SCopSAR simplifies the Radar requirements since it uses only one carrier frequency, one waveform, and one channel. Simulations and real ERS-2 satellite raw data are used to validate the theoretical findings presented in this paper.

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Section: Experiments Using Real Ers-2 Raw Datamentioning

confidence: 99%