Self-adapting Radar Video Echo Acquisition System based on LZW Algorithm

This paper presents a high-speed low-complexity Field Program Gate Array (FPGA) design and implementation of the lossless Lempel-Ziv-Welch (LZW) algorithm on Xilinx Virtex-E device family for selfadapting Radar video echo data acquisition Applications. A multi-channel self-adaptive variable sampling rate data acquisition system based on FPGA and I2C bus is introduced. By writing the frame data into E2PROM and design the interface between FPGA and E2PROM, multi-channel data programmable sampling ratio is realized. Because the radar echo samples contain abundant phase information and details of the image data, phase relation of the original image must be maintained. So it will not affect the reconstruction image information in data compression process. In order to ensure the accuracy of imaging data of radar echo data, acquisition system adapts lossless compression algorithm LZW based on FPGA. The algorithm principle of LZW and the coding flow are introduced. By comparing with the compression ratio in different encoding unit, 12bit encoding width is appropriate. Simulation results show that the LZW algorithm has better compression ratio for echo text data.