Investigation on an ultra–wide-swath, multiple-elevation-beam SAR based on sweep-PRI mode
A promising candidate for ultra-wide-swath spaceborne synthetic aperture radar (SAR) imaging with a fine resolution is the multiple-elevation-beam (MEB) SAR. Standard MEB SAR suffers from deterioration of noise-equivalent sigma zero (NESZ) and vary ambiguity-to-signal ratio (RASR) performances within the so much end of the imaging swath and disturbances between completely different subbeam elevations. Another inherent drawback of previously proposed MEB SAR systems is that the blind vary result, that blocks continuous mapping. In this paper, we have a tendency to introduce a potential changed MEB SAR system based mostly on space-time-frequency waveform encoding on transmit and on digital beamforming (DBF) on receive that provides a abundant improved performance of NESZ and RASR, a lower requirement for the transmit peak power, and a more versatile signal energy distribution. Furthermore, to overcome the blind range problem, a periodic sweep of pulse repetition interval (PRI) design strategy is utilized. During this paper we have a tendency to are developing the idea of sweep-PRI mode into a complete detailed processing theme. The explicit signal model, the instructive system design guideline, and therefore the corresponding signal processing scheme for this operational mode are described thoroughly. A recurrent nonuniform reconstruction algorithm is adopted first to deal with the problems of nonuniform sampling and periodic gaps within the azimuth preprocessing. Additionally, an in-depth analysis of system performance for the presented MEB SAR system is carried out. Finally, an example system with a 400-km-wide swath and 3-m resolution is designed based on the proposed methods. The simulation results demonstrate that the presented SAR system shows satisfactory performance.
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