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A Contrast-Based Algorithm For Synthetic Range-Profile Motion Compensation
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DOI：10.1109/TGRS.2008.2002576.png)
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In stepped-frequency radar, target motions produce range-profile distortions. Range shift, signal-to-noise ratio loss, and symmetric spreading are produced by target radial velocity, whereas target radial acceleration is mainly responsible for asymmetric smearing. Acceleration-distortion effects are usually negligible when a high Pulse Repetition Frequency (PRF) is used, although this is not the case for low-PRF radars. In this paper, a new motion-compensation technique based on contrast optimization is proposed. The innovative contributions of this paper are as follows: 1) A theoretical analysis of the distortions produced by target motions on the reconstruction of synthetic aperture radar is provided; 2) the proposed technique compensates both phase terms, which are due to target radial velocity and acceleration; therefore, synthetic range profiles can be focused by processing low-PRF radar returns; 3) a new cost function for the synthetic range profiles (namely, contrast) is defined and used for motion compensation; 4) the proposed technique can be applied to any kind of stepped-frequency waveforms; and 5) an estimation error analysis is performed, first theoretically and then by means of both simulations and real data.
Keyword:
Radar imaging
radar signal processing
期刊
IF:
8.6
论文数:
2.1W
被引数:
10.7W
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