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Waveform Diversity and Adaptive Signal Processing to Improve SBR GMTI Performance Degraded by MEO Antenna Mechanical Distortions

Waveform Diversity and Adaptive Signal Processing to Improve SBR GMTI Performance Degraded by MEO Antenna Mechanical Distortions

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This paper studied the use of novel waveforms, adaptive RF transmit and STAP receive compensation techniques to overcome the limitations to MEO space-based radar GMTI detection, caused by both clutter range ambiguities enhanced by the earth's rotation, and antenna mechanical distortions. Both very large phased array and cylindrical reflector antennas were considered and it was demonstrated that the deleterious effects of these phenomena were greatly mitigated by the use of quadratic phase modulation waveforms, adaptive RF subarray phase shift compensation and STAP true target steering vector correction. Subsequent research investigated RF column phase shift corrections on distorted reflectors in conjunction with QPMW and STAP that resulted in a 2-3:1 improvement in GMTI MDV and NDBZW detection.

Inspec keywords: radar clutter; radar antennas; reflector antennas; waveform analysis; space-time adaptive processing

Other keywords: distorted reflector; NDBZW detection; cylindrical reflector antenna; RF column phase shift correction; waveform diversity; MEO space-based radar GMTI detection; adaptive signal processing; GMTI MDV; QPMW; adaptive RF transmit technique; phased array; STAP true target steering vector correction; clutter range ambiguity; STAP receive compensation technique; SBR GMTI performance; adaptive RF subarray phase shift compensation; quadratic phase modulation waveform; MEO antenna mechanical distortion

Subjects: Mathematical analysis; Signal processing and detection; Single antennas; Radar equipment, systems and applications

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