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Design and implementation of a digital receiver based on spaceborne SAR subsystem

This paper proposes that a design and implementation of digital receiver based on spaceborne synthetic aperture radar (SAR) subsystem. This receiver can conduct block adaptive quantization (BAQ) compression on the received echo signal, and select the block size of BAQ compression and update the BAQ compression code table based on the ground annotation information, so as to improve the imaging quality more effectively and flexibly. In addition, it can update the field programmable gate array (FPGA) program on-orbit by update data on the ground, and correct and maintain the FPGA program saved in FLASH on-orbit, which can effectively resist single event upset (SEU) and improve the reliability of this receiver.