Analysis And Process Of High Range Resolution Imaging Radar Signal

High range resolution is the key technology in radar imaging, in order to obtain the high range resolution, the system should have a very high instantaneous bandwidth, this qualification is hard to satisfy for hardware application, sometimes is not available. Use stepped-frequency technology can construction a wide-bandwidth chirp pulse by combine a burst of narrow-bandwidth chirp pulse transmitted at stepped-frequency intervals. This synthetic wide-bandwidth has a same range resolution as the wide-bandwidth. The advantage of this technology is the reduction of instantaneous bandwidth and sampling rate requirement in the radar system.This paper introduced a method to combine a number of narrow-bandwidth chirp pulses stepped in frequency in order to achieve high range resolution and present the processing steps. The relative motion between the radar and the target has been considered in this paper and presented the method in synthetic bandwidth compensating for motion up to different grades. A description of this technique is given, results obtained from processing simulated and SAR data are present and discussed.