研究目的
Investigating the micromotion target detection problem for the multichannel synthetic aperture radar (SAR)- ground moving target indication system.
研究成果
The proposed GLRT detection method is effective for micromotion target detection in multichannel SAR-GMTI systems, as validated by theoretical analysis and simulations. However, it has high computational complexity and wide mainlobe issues that require further research.
研究不足
The computational cost is high due to parameter searching, and the mainlobe of the micromotion target is wide, which may mask nearby targets with lower radar cross sections.
1：Experimental Design and Method Selection:
The study uses a generalized likelihood ratio test (GLRT) detector for micromotion target detection in multichannel SAR systems. Signal models for micromotion targets and ground clutter are established in the raw data domain. Theoretical analysis of detection performance is based on probability density functions of test statistics.
2：Sample Selection and Data Sources:
Simulated heterogeneous SAR data are used, generated from a real SAR image collected by Sandia National Laboratories, with injected micromotion targets.
3：List of Experimental Equipment and Materials:
A three-channel SAR system is simulated with parameters including carrier frequency, platform velocity, channel distances, range resolution, azimuth resolution, and pulse repetition frequency as specified in Table I of the paper.
4：Experimental Procedures and Operational Workflow:
The GLRT detector is implemented with parameter searching for micromotion parameters (rotating radius, frequency, initial phase). Computational steps include signal whitening, convolution operations using FFTs, and threshold comparison for detection.
5：Data Analysis Methods:
Detection performance is evaluated using probability of detection (PD) and probability of false alarms (PFA). Empirical pdfs of test statistics are compared with theoretical models, and output signal-to-clutter-plus-noise ratio (SCNR) is analyzed.
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