Research And Implementation Of Phase Encoding Signal Pulse Pressure

The Pulse Compression Technology is widely used in Modern Radar, in ensuring the Enough Detection Range, it also can obtain narrow pulse through the corresponding pulse compression method at the same time. Pulse compression technology is suitable for the radar signal with large product of Timewidth and Banwidth, such as Linear FM signal,Nonlinear FM signal,Frequency coded signal and Phase coded signal. Binary phase coded signal with a ambiguity figure which is similar to drawing pin, and Polyphase coded signal has a strong doppler tolerance, with the development of digital signal processing technology, Phase coded signal is increasingly applied to the pulse compression technology. However, the side-lobes resulting from Autocorrelation has limited the application of phase coded signal in pulse compression system. Therefore, How to achieve side-lobes suppression better is a key issue for the phase coded signal into the practical application of pulse compression.This article has mainly researched and analyzed the inherent characteristics,pulse compression and side-lobe suppression technology of phase coded signal, and gives the hardware implementation of pulse compression system. First embarked from "point target" Echo model and Ambiguity function theory, analyzed the characteristics of phase coded signal; and discussed a detailed analysis of the typical binary phase coded signal including Barke code,m sequence,MAC sequence and the typical polyphase coded signal including Frank code,P1 code,P3 code,P4 code. Then according to the different applications of binary phase coded signal and polyphase coded signal, studied different side-lobe suppression methods for binary phase coded signal and polyphase coded signal respectively, and compared these methods comprehensively. In view of the phase coded signals with large TB value, proposed a side-lobe suppression method which is based on Adaptive LMS algorithm, through simulation and analysis, it is founded that this method has a smaller amount of computation, Stable convergence and fast speed of convergence. Finally, according to the actual application background, completed the design and implementation of the digital frequency domain pulse compression system by the FPGA hardware platform and using frequency domain method, and test it by Modelsim simulation software and FPGA hardware platform, verified the correctness of the system.