High-low orbit collaborative spaceborne multistatic SAR high quality imaging arc segment design method

Le résumé fourni par la source

High-low orbit collaborative spaceborne multistatic SAR utilizes a high-orbit satellite to transmit signals, while multiple low-orbit satellites simultaneously receive ground object reflection echoes. The coherent fusion of echoes from multiple receivers enables flexible and efficient imaging of specified areas. However, the imaging quality depends on the orbital arcs where each satellite platform receives echoes. Therefore, it is necessary to design the arcs passed by each receiver during echo recording. A design method for imaging arcs in high-low orbit collaborative spaceborne multistatic SAR is proposed in this paper. First, a space rectangular coordinate system is established to uniformly characterize parameters such as satellite platform positions and velocity vectors, as well as the mapping relationship between echo spatial spectrum distribution characteristics and imaging quality representation. Then, the start points of the imaging arcs and the distribution range of velocity vectors for secondary receivers are preliminarily determined based on the joint constraints of extension alignment consistency, relative rotation angles, and distance-azimuth resolution balance of echo spatial spectrum between primary and secondary receivers. Finally, the final imaging arcs are determined according to the observation squint angle and spatial spectrum interval. Imaging simulation results verify the effectiveness of the proposed high quality imaging arc segment design method.

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