Modulated Signal (fsk / Psk) Processing

This dissertation is the expanding of the military project of '95'advance research,a novel multi-modulation technique designing radar signal waveform is introduced on the links with the project of the National Natural Science Fundation of China (NSFC), named "produce and process the multi-modulation signal of the sensor with strong detectability and identifiability".Based on the analysis of the equal-probability-distributing FSK/PSK multi-modulation signal,we construct a new pseudo-random FSK/PSK multi-modulation signal and we design and simulink on the computer the partly-matched processing signal of this signal.The purpose of the design is to construct a processing signal to combine with the pseudo-random FSK/PSK multi-modulation signal,so that we could get a strong response of the target.The method digitally modulates the pseudo-random FSK/PSK multi-modulation signal and the partly-matched processing signal of this signal with the same frequencies sequence and phases sequence in the same time,additionally,add a mismatch-phase sequence to the partly-matched processing signal. Frequency code is not uniformity distribution and keeps to a probability distribution function defined by the spectral characteristics of the target of interest. The phase code is equally duality pseudo-random sequence and used to reduced the sidelobes of the signal correlation function. And the mismatch-phase sequence is corresponding with the frequency sequence one by one. The pseudo-random FSK/PSK multi-modulation signal and the partly-matched processing signal remain the information of the target of interest.Compared with the other processing methods, the partly-matched procession could depict the target's information effectively,and could get a higher output SNR under a noisy environment.In this dissertation,the deduction and the simulink on the computer of the average ambiguity function of the pseudo-random FSK/PSK multi-modulation signal are presented.Also,to the partly-matched procession,analysis in theory and simulink on computer are presented.the partly-matched procession applied in radar field is also discussed.This paper contains the following four parts:1． Construct a new kind of pseudo-random FSK/PSK multi-modulation signal.2． Present the concept of the partly-matched procession of the multi-modulation signal.3． Analyse in theory and simulink on computer about the partly-matched procession.4． Discuss the application of the partly-matched procession in radar field...