The Study on In-pulse Characteristics Extraction of Pseudo Code Phase Modulation-Carry Frequency Modulation Combined Fuse Signal Based on the FM-AM Transduction Analysis
Huichang Zhao · Journal of Astronautics · 2007
When the pseudo code phase modulation and the carry frequency modulation combined signal is used to measure the distance and velocity,both the resolution and the precision are high.So this kind of signal is used in such field as radar and fuze widely.In the electronic countermeasure,the feature parameter of this signal must be extracted effectively in order to implement the cheat jamming.The theory and implementation on the FM-AM transduction analysis are introduced in this paper.This method is used to analysis the in-pulse characteristics of pseudo-code fuse signals such as pseudo-code phase modulation,pseudo-code phase modulation combined by sinusoid frequency modulation and pseudo-code phase modulation combined by linear frequency modulation.The simulation result shows that both the characteristic of carry signal and phase changed position caused by the pseudo-code can be extracted effectively in SNR=5dB.