Design And Implementation Of Sar Real-time Imaging Processor To Capture And Transpose Module

With the development of SAR imaging processing technology, the SAR imaging processing system has been widely used in military and civilian fields. The large volumes and high speed of processing data, has become the two major issues of SAR real-time imaging processor.At the beginning of the SAR imaging processing, the system needs to do continuous sampling of the analog echo signals of I channel and Q channel. Because SAR echo signal has high bandwidth, large dynamic range, and stringent precision, at the same time, the existing data sampling system is difficult to satisfy those requirements, so it is necessary to design a data sampling system dedicated for SAR imaging system. In the SAR imaging processing, the system needs to do transpose operation to imaging data between the distance compression and the azimuth compression. The read and write speed of the previous transpose algorithm doesn't match each other, and the low efficiency pulls down imaging speed of the system.According to the indicator requirements of SAR imaging processor, this paper presented a hardware implementation program of data sampling system, proposed and implemented a memory transpose algorithm based on DDR. The primary work are as follows:1) Completed the data sampling system hardware and program design:circuit design and implementation, sampling control program design and implementation in FPGA.2) Designed a dedicated memory transpose algorithm based on DDR, and used it in the transpose module of SAR imaging processor:a dedicated memory transpose algorithm design based on DDR, efficiency comparison with the previous transpose algorithm, program design and implementation of storage transpose control module in FPGA.3) Completed the system debugging design:data sampling board debugging, storage transpose module debugging, debugging with the other modules of SAR imaging processor, debug result analysis. The SAR signal sampling module and storage transpose module completed in this papers, are very important for the real-time SAR imaging processor, which improved the performance of SAR imaging system, and can be applied to the high-speed data processing and storage, or other related fields.