摘要
讨论了基于基2-FFT的伪码快速捕获方法,论述了其中常见的数据内插处理算法并提出Sinc数据内插新方法。Sinc数据内插算法采用Sinc内插滤波器来实现数据的精确内插,以满足基2-FFT的数据点数需要。仿真表明,采用Sinc数据内插方法实现的基2-FFT伪码快速捕获系统,其捕获性能优于传统的补零法和线性内插法。Sinc内插算法更适合在低信噪比下工作和对捕获时间有严格要求的系统。
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-paddlng 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.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2005年第11期1957-1960,1970,共5页
Systems Engineering and Electronics
