Performance of Lifting-circular Wavelet Scheme for Signal Acquisition in GNSS Receivers

This study proposes a novel method to acquire the navigation signal parameters for Global Navigation Satellite System (GNSS). This method utilizes modified discrete wavelet transformer (MDWT) to reduce operation samples of circular convolution during signal acquisition process and to divide the wavelet space, indicating that the MDWT is better in de-correlation ability and signal acquisition performance. Besides, it can cut down the effect of noise and interference on signal acquisition performance and enhance the signal to noise ratio on the basis of priori knowledge of the signal characteristics. Simulations and experiments demonstrate that the proposed method can improve performance in shorten acquisition time and lower computation complexity as opposed to traditional fast Fourier transform (FFT) based methods.