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Optimum relative speed discretisation for detection of moving objects in wide band SAR
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2007 (English)In: IET Radar, Sonar and Navigation, ISSN 1751-8784 , Vol. 1, no 3, 213-220 p.Article in journal (Refereed) Published
Abstract [en]

Here, Ground moving target indication (GMTI) using synthetic aperture radar (SAR) is considered. SAR GMTI requires that relative speed between the target and the SAR platform is included in the detection algorithm. A separation between the true relative speed and the relative speed used in the SAR process will cause unfocused targets, and decrease detectability. Blind hypotheses of relative speeds are used in the detection phase of moving targets in SAR. The step size between the hypotheses (or discretisation step) in relative speed involves a trade off between the number of hypotheses to test and detectability. A large number of tests will increase detectability but will also increase computation load and vice versa. The relevance of relative speed increases as the azimuth integration time gets larger. Long integration time is associated with low signature moving target detection in strong clutter environments, or for SAR GMTI at low frequencies. The optimum discretisation of normalised relative speed for moving target detection has been determined. The optimum discretisation is derived from the moving target impulse response. Use of optimum discretisation reduces the computation burden in SAR GMTI and secures the detectability.

Place, publisher, year, edition, pages
London: IET , 2007. Vol. 1, no 3, 213-220 p.
National Category
Signal Processing
URN: urn:nbn:se:bth-9263ISI: 000255040100006Local ID: diva2:837043
Note from: 2012-09-18 Created: 2007-05-30 Last updated: 2016-05-24Bibliographically approved

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Pettersson, Mats
Signal Processing

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