Multichannel Pulse Compression System for Sar Data Based on Xilinx's Virtex7 Fpga

Synthetic Aperture Radar (SAR) pulse compression on Xilinx's Virtex7 FPGA platform is an important step in SAR data processing . The realization of a multichannel pulse compression system by using all digital method has the characteristics of high reliability, strong antidisturbance, good flexibility and convenient for application. In essence, pulse compression is a method of frequency spectrum expanding, and is used in matched filtering. It incarnates the matching level of filter and the expectant phase of received signal. A multichannel pulse compression system is designed using FFT IP core which can be reused in different periods of digital pulse compression, respectively performing FFT and IFFT calculation, so that the hardware consumption is saved significantly. This paper presents Multichannel Pulse Compression System for Synthetic Aperture Radar which is based on Xilinx FPGA, digital signal process module and the data buffer module in detail. This design uses Xilinx's Virtex7 FPGA family, and achieves the pulse compression processing on A/D collection down-converted signal by the method of frequency domain pulse pressure. The Rapid IO transmission interface is used for high-speed data transmission between boards. As for this pulse compression system, it’s mainly used to receive the data after AD sampling and digital down converter and transmit the data after pulse compression to the DSP board which makes further data processing. The Control-FPGA is used for data transmission and the system working state control. The data transmission includes PCI transmission, serial Rapid IO transmission and serial RocketIO transmission.PCI bus interface is used for the transmission of control and status information between the upper machine and the ControlFPGA.RocketIO transmission interface is used for the highspeed transmission between the ControlFPGA and the signal-processing FPGA.