De-noising Method of a Certain Missile Homing and Control Signal Based on Wavelet Transform

Homing and control signal is important information which can reflect system performance and technical conditions of guidance system, and homing and control signal is one of core contents of guidance system detection, and de-nosing of the signal has an important meaning to the accuracy of guidance system detection and assessment. This paper introduces wavelet de-nosing method for the characteristic of homing and control signal and its noise signal. In the process of measuring the control signal of certain missile guidance system, the factors, such as the environment, the detection system, etc., which makes the noise signal mixed in the guidance control signal measured. It is an importance of analyzing source of the noise and noise characteristic and eliminating the noise produced in the detection procedure. Fourier Transform and short time Fourier transform (STFT) distinguish the control signal and noise signal in the characteristic of frequency by launching the signal in the frequency-domain, then eliminating the noise. Wavelet transform is multi-resolution analysis method, which can get the characterization of local signal information in the time-domain and frequency-domain. So it is widely used in the signal de-noise, especially in the signal which has mutation characteristics and the noise signal is difficult to totally eliminate in frequency-domain, which has its unique advantages.