改进的直扩信号频域多普勒补偿方法的研究与仿真

在直接序列扩频通信中发射机和接收机之间的相对动态会在载频信号中引起多普勒效应.针对直扩信号接收捕获处理中的多普勒补偿问题,并考虑工程实现中FFT点数的限制,提出一种频域多普勒补偿改进方法,该方法采用预累加处理技术对接收信号和本地信号进行预处理,并通过调整累加参数控制FFT点数及补偿精度.仿真结果表明,与传统的频域多普勒补偿方法相比,该补偿方法可以有效地控制FFT点数并提高多普勒补偿精度从而提高直扩信号接收处理效率.

Research and Simulation on the Improved Doppler Compensation Method of DS Signal in Frequency Field

The relative dynamics between the transmitter and the receiver will cause the doppler effect in direct sequence spread spectrum communication.An improved doppler compensation method is proposed in frequency field,aimming at the doppler compensation of DS signal reception capture and considering the limit of the numbers of FFT in engineering implementation,which adopts additive pretreatment technology for the received signal and the local signal,and controls the numbers of FFT and the compensation accuracy.The simulation analysis and the data results show that,comparing with the traditional doppler compensation method in frequency,the improved compensation method can effectively control the numbers of FFT and raise the compensation accuracy to improve the efficiency of DS signal reception.