DocumentCode :
3961
Title :
Airborne SAR Moving Target Signatures and Imagery Based on LVD
Author :
Lei Yang ; Guoan Bi ; Mengdao Xing ; Liren Zhang
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Volume :
53
Issue :
11
fYear :
2015
fDate :
Nov. 2015
Firstpage :
5958
Lastpage :
5971
Abstract :
This paper presents a new ground moving target imaging (GMTIm) algorithm for airborne synthetic aperture radar (SAR) based on a novel time-frequency representation (TFR), Lv´s distribution (LVD). We first analyze generic moving target signatures for a multichannel SAR and then derive the analytical spectrum of a point target moving at a constant velocity by a polar format algorithm for SAR image formation. SAR motion deviation from a predetermined flight track is considered to facilitate airborne SAR applications. LVD, as a recently developed TFR for the analysis of multicomponent linear-frequency-modulated signal, is adopted to represent the target kinematic spectrum in the Doppler centroid frequency and chirp rate domain. As a result, the proposed SAR-GMTIm algorithm is capable of imaging multiple moving targets even when they are located at the same range resolution cell. Some practical issues such as imaging maneuvering targets and small/weak targets are discussed to enhance the applicability of the proposed algorithm. Simulation results with isotropic point moving targets are presented to validate the effectiveness and superiority of the proposed algorithm. Raw data collected by an airborne multichannel SAR are also used to verify the performance improvement made by the proposed algorithm.
Keywords :
radar imaging; remote sensing by radar; synthetic aperture radar; Doppler centroid frequency; GMTIm algorithm; SAR image formation; SAR motion; SAR-GMTIm algorithm; airborne SAR applications; airborne SAR moving target signatures; airborne multichannel SAR; airborne synthetic aperture radar; chirp rate domain; constant velocity; generic moving target signatures; ground moving target imaging; imaging maneuvering targets; isotropic point moving targets; multichannel SAR; multicomponent linear-frequency-modulated signal; point target analytical spectrum; polar format algorithm; raw data; target kinematic spectrum; time-frequency representation; Azimuth; Clutter; Imaging; Radar tracking; Synthetic aperture radar; Time-frequency analysis; Ground moving target imaging (GMTIm); Lv´s distribution (LVD); synthetic aperture radar (SAR); time-frequency representation (TFR);
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2015.2429678
Filename :
7150388
Link To Document :
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