Signal model and imaging algorithm for spaceborne interrupted continuous-wave synthetic aperture radar

Air‐borne linear frequency modulation range interrupted continuous‐wave SAR for high‐resolution imaging

“…For microsatellites, the LFMAICW‐SAR system with a single antenna is proposed in [4, 5], in which the antenna keeps transmitting signal until it is switched to the receiving radar echoes mode. The sending radar pulses lasts for just enough time for the signal to be transmitted and scattered back to the spacecraft, the receiving echo mode starts instantly when the echo signal from the nearest range reaches the antenna and will last until all the signals have returned and been collected by the radar receiver as shown in Fig.…”

“…One is used to transmit radar pulses, while the other is adopted to receive its radar echoes. For microsatellites, a novel linear frequency modulation azimuth interrupted CW SAR (LFMAICW‐SAR) with a single antenna is proposed, and it would lose some pulses to transmit according to the space‐borne imaging geometry [4, 5]. To further reduce the volume and the weight of the air‐borne SAR system, a new air‐borne LFMCW SAR imaging scheme named as linear frequency modulation range interrupted CW SAR (LFMRICW‐SAR) is proposed, which also only requires one antenna to transmit radar pulses and receive its echoes.…”