Implementation of a new fast PN code-acquisition using radix-2 FFT
L. Ju · Systems engineering and electronics · 2005
To solve the problem of acquiring the PN(pseudo noise) code rapidly under low SNR(signal-noise ratio) environment for a PN code acquisition system,the PN code acquisition method based on radix-2 FFT is analyzed,and the common data interpolation algorithms adopted by this method are discussed and a new algorithm,Sinc data interpolation,is presented.This algorithm uses the Sinc interpolation filter to implement the precise data interpolation to satisfy the demand for the data samples number of radix-2 FFT.The simulation indicates that the radix-2 FFT acquisition system using Sinc data interpolation method has better performance than zero-padding method and linear interpolation method.Sinc data interpolation method is more suitable for those systems which have a stringent demand for low SNR environment and acquisition time.