The Technique Of Raw Data Playback For MiniSAR

The technique of raw data playback is quite essential to debug real-time signal processor for Synthetic Aperture Radar(SAR). In this paper, with the background that debugging the MiniSAR's real-time imaging processor, a study of the high-speed data playback to obtain large amounts of raw data is developed, which has already been applied to the debugging process. In the playback's implementation, CF card is used as the high-capacity storage media, FPGA is used as main control chip, and serial Rapid IO is used to achieve high-speed data transfer. The main work in the paper is summarized as follows:1. The technical standards and the FAT32 file system of the CF card is sdudied. In order to reduce the operational complexity of the file system and enhance CF card's data transfer rate, a real-time file management is presented, where the files in the CF card are allocated with the same size and File Allocation Table(FAT), File Directory Table(FDT) and File Data Area are managed separately. The file management can be operated simply and reliably in real-time.2. The RapidIO protocol is studied and its realization in Xilinx Virtex6 series' FPGA and TMS320C6678 DSP is researched. To meet the demand of the high data transfer rate during playback, the SRIO link between FPGA and DSP is designed by configuring the SRIO IP core, modifying the HDL source code in the FPGA, and initializing the SRIO module in the DSP. The designed SRIO link has a high-speed data transfer rate.3. Real-time MiniSAR imaging processor is introduced, and a time-burst scheme for data playback based on the analysis of the processor's practical work is designed. The proposed scheme effectively realized the simulation of the processor's practical work. According the scheme, the data playback is implemented in details, and its correctness and playback rate are tested by using CCS5 and C hipScope software. The tested rate is steady at 70.6MB/s, which meets the requirement of the high-speed data playback.4. In order to meet the needs of real-time imaging processor's debugging, upper computer software is designed, and the validity of the soft ware's control function is tested. The tested results show that the upper computer can control the data playback flexibly and effectively. Finally, the data playback is applied to the real-time imaging processor's debugging.