基于FPGA的干涉成像高度计在轨多视处理设计OA

In order to carry out wide-swath measurements of sea surface height globally,interferometric imaging radar altimeters op-erate in an all-time mode,generating a massive amount of raw data that require high-precision compression through on-orbit data procession and muti-look averaging.Due to the impact of drastic variation in ground range resolution of interferometric imaging al-timeters,the conventional uniform window multi-look schemes suffer from significant errors.Although the existing non-uniform win-dow multi-look schemes can address the error issue,it is hard to achieve a pipelined architecture of field programmable gate arrays(FPGA),resulting in high time delay and large resource consumption.To this end,a FPGA-based interpolated multi-look proces-sor(IMLP)is proposed in the paper,which achieves pipelined multi-look processing by using an interpolated and weighted aver-age multi-look processing method and combining it with FPGA design schemes such as non-uniform linear interpolators and multi-channel parallel processing.Verification based on the measured data from the Tiangong-2 interferometric imaging radar altimeter demonstrates that IMLP significantly reduces the error of sea surface height measurement,compared with traditional uniform win-dow multi-look processing;meanwhile,it reduces logical resource consumption by about 20％,computation and storage resource consumption by around 40％,and time latency by 27.45％,compared with existing non-uniform window multi-look schemes.