Research On The Signal Processing Technology Of The Pseudo-random Code Phase Modulation Fuze

Pseudo random code phase modulation fuze uses pseudo random code good autocorrelation properties to work and this fuze has precision fixed distance performance and strong anti-jamming performance.These performances make this fuze become one of the important development direction of fuze system. Pseudo-code system fuze signal processing generally adopt related testing technique, by putting a fuze receiver demodulation of pseudo-code and the local pseudo-code delay doing related processing, to realize distance and speed measuring function. With the rapid development of fuze technology, pseudo-code fuze signal processing technology has been improved and perfected. Studying signal processing technology about pseudo random code phase modulation fuze, has the important practical significance to the development and application of this fuze.This thesis first introduces the related theory of Pseudo random code phase modulation fuze signal processing, and analyzes time domain and frequency domain characteristics of pseudo random code signals in detail. On the detailed analysis of pseudo-code phase modulation fuze working principle, on the basis of analysis and derivation of the pseudo-code phase modulation fuze signal process, the author discusses pseudo-code element width, pseudo-code cycle and pseudo-code code word frequency three main parameters choice, and from the distance resolution, maximum no fuzzy distance, distance cut-off characteristic three aspects, the author analyzes the distance of pseudo-code phase modulation fuze performance. The author builds pseudo-code phase modulation fuze receiver model with the presence of interference. Under this model, according to the working process of the signal, the author deduced these things in detail like gaussian white noise jamming, noise amplitude modulation jamming, and noise frequency modulation jamming from pseudo-code phase modulation fuze receiver output letter dry than total gain. The author analyzed the pseudo-code phase modulation fuze noise interference, NFM interference, NAM interference resistance, and discussed the pseudo-code element width, pseudo-code cycle, receiver bandwidth, Doppler frequency and bandwidth, interference noise modulation coefficient, quality factors and so on. What’s more, the Gauss white noise, noise amplitude modulation (NAM) jamming, noise FM jamming (NFM) fuze receiver output signal interference ratio total gain of pseudo random code fuze anti noise interference, NFM interference, NAM interference are deduced, and the related factors affecting the anti-jamming performance is discussed.Using Matlab/Simulink pseudo code phase modulation fuze Signal Processing simulation design, the author completes the pseudo random code phase modulation fuze low noise amplifier circuit, demodulation circuit, pseudo code signal shaping amplifying circuit, digital correlator design and simulation. In this thesis, the design of pseudo random code phase modulation fuze signal processing circuit can realize the function of signal processing. In this thesis, the thinking of studying pseudo-code phase modulation fuze signal processing technology can also be regarded as a reference of other system fuze signal processing.