Odd And Even Based Sar High-speed Data Acquisition System

Synthetic Aperture Radar recently is used in military and civilian because of its excellent performance in complex weather and high resolving power. In SAR system, the in-phase and quadrate radar echoes must be sampled simultaneity and stored in the recorders for a long-time. Only the available echoes can be stored because of the speed limitation of hardware. The receiver needs to detect the position of available echoes in bistatic SAR. In this paper, a method to detect the position of available echoes in the integrity period based on slide-window was used. A high-speed data acquisition and storing system, which is based on SATA disks and used in bistatic and monostatic SAR, is introduced in this dissertation. The FPGA which is produced by Xilinx is used to control the system's working time and communication between acquisition module and storage module. The SMT387 module changes the data's format into FAT32 file system and controls the SATA disk. The character of this system is that the data is stored in FAT32 file system, which is generally used in computers and makes the recorded data can be easily read and processed by computers. The SATA disk whose average recording speed arrives at 40 MB/s is chosen to be storage, and the data communication between acquisition module and storage module is finished by SHB whose speed is 240 MB/sThe primary work in this dissertation:A method was present to detect the radar echoes based on slide-window and proved both by theory and experiment result. The system's construction and design proposal was introduced from every part of it.The central controlling and system working flow was completed, the controlling of SHB bus was realized.The system was validated in the car's and plane's experiments.