Pseudo Code Is Given Away From The Signal Processing Technology

To improve the execution of the shell, its inner fuse's performance of distance-determination is very important. For its many inherent advantages, the pseudo-random code phase-modulated signal is always chosen as the ideal signal for distance-determination. When the noise in the signal is gauss noise, the best signal receiver nowadays is always a correlator, which achieves distant-determination through the sharp autocorrelation function of the pseudo-random code. However, for the complication of the background of the battlefield, the performance of the distance-determination system must be improved, especially when the current correlator works on the principle of double autocorrelation, which can't output very high peak value under low SNR, thus unable to resist some strong countermeasure. Furthermore, the technologize of modern war needs more precision of the distance-determination.In this paper, firstly, the produce and property of the pseudo-random code is introduced. Then, on the basis of the principle of the distance-determination system, the signal considered Doppler effect in different stages is deduced and given the last expression. Thirdly, the influence of the Doppler effect on this system is analyzed and the measure to weaken this influence is discussed. Under the basis of these, the lately widely used wavelet transform in DSP is used to wipe off the noise in the band of the signal frequency. Lastly, for its function of auto noise-resistance and double integral, the triple correlation is also used to improve the sensitivity of the receiver. Both of the two methods are simulated, whose results are fairly satisfying, thus greatly enhance the performance of the distance-determination in low SNR.