Improved Acquisition Method of GPS Signal by Wavelet De-noising
Chenlan Wang, Zhong Wang · 2015
To solve the problem that it is difficult to capture the weak GPS signal, an improved wavelet noise reduction algorithm is proposed. By integrating correlation integral differential accumulation method, wavelet decomposition and signal reconstruction, the algorithm can improve the signal-to-noise ratio effectively but not increase the computing time notably. In order to obtain a higher signal-to-noise ratio, a new self-transformation threshold choosing method is introduced in this paper. It is optimizing the coefficients of wavelet decomposition, based on the different behavior of the noise in different decomposition level. The simulation shows that the de-noising effects are improved obviously, the wavelet de-noising method is better than the traditional method. KEYWORD: self-transformation threshold; wavelet de-noising; weak GPS signal acquisition component