高动态扩频信号快速捕获技术研究  

Research on the quick acquisition method of the high dynamic spread spectrum signals

作　　者：任宇飞[1] 程乃平[1] 

机构地区：[1]装备指挥技术学院光电装备系,北京101416

出　　处：《国外电子测量技术》2009年第7期24-26,29,共4页Foreign Electronic Measurement Technology

摘　　要：主要研究了两种高动态扩频信号快速捕获的方法,即基于FFT的频域(载波)并行捕获法和基于FFT的时域(伪码)并行捕获法,并使用MATLAB进行了仿真和比较。仿真结果表明:基于FFT的频域并行捕获可捕获较大的频偏并跟踪一定的频率变化率,可用于卫星变轨等高动态、高加速度等飞行过程。而基于FFT的时域并行捕获可快速捕获码相位,用于在轨飞行的飞行器,可根据轨道参数提前预报其多普勒频偏,但同时需要精密测距的飞行过程。This paper mainly studies two kinds of quick acquisition methods of high dynamic spread spectrum signals. They are all FFT based, one is the frequency domain parallel acquisition of the carrier frequency, the other is time domain parallel acquisition of PN code. After simulating with Matlab and comparing the results, it is concluded that this FFT based frequency domain parallel acquisition method can acquire a large Doppler frequency shift and track some frequency changes, and it can be used for the flying process containing high dynamic and acceleration such as the satellite obit-changing. While the FFT based time domain parallel acquisition method can acquire the phase of the PN code quickly, and it can be used for the flying process of the on-track aero craft,which can predict the Doppler frequency shift according to the orbit parameters and still needs a precise ranging.

关 键 词：FFT 载波捕获 伪码捕获 

分 类 号：TN929.533[电子电信—通信与信息系统]