一种扩展GMSK扩频多普勒捕获范围的方法  

A Method to Extend Range of GMSK Spread Spectrum Doppler Acquisition

作　　者：廖小海 欧家成 周彬 王慧 许洋 LIAO Xiaohai;OU Jiacheng;ZHOU Bin;WANG Hui;XU Yang(China Academy of Aerospace Electronics Technology,Beijing 100094,China;Beijing Research Institute for Telemetry,Beijing 100076,China)

机构地区：[1]中国航天电子技术研究院,北京100094 [2]北京遥测技术研究所,北京100076

出　　处：《宇航计测技术》2024年第2期31-38,共8页Journal of Astronautic Metrology and Measurement

摘　　要：伪码捕获在短时猝发GMSK(高斯滤波最小频移键控)扩频通信中是不可缺少的一环,尤其是在接收端弱信号的情况下,多普勒频移会严重影响接收端伪码捕获性能。针对短时猝发GMSK扩频体制的特殊性,设计了接收端伪码捕获算法,推导分析了该捕获算法的相关公式,并在此基础上提出了一种多通道并行接收捕获的方法以适应短时猝发条件,该方法通过扩展多普勒适应范围以提升GMSK扩频通信系统伪码捕获性能,将该方法应用到短时猝发GMSK扩频通信系统中,可提升伪码捕获峰值阈值约2.7 dB以满足系统灵敏度要求,且占用硬件资源较少。Pseudo-code acquisition is an indispensable and important part in short-time burst GMSK spread spectrum communication.Especially in the case of weak signal at the receiving end,Doppler frequency shift will seriously affect the performance of pseudo-code acquisition at the receiving end.Aiming at the particularity of short-time burst GMSK spread spectrum system,a pseudo-code acquisition algorithm at the receiving end is designed,and the relevant formulas of the acquisition algorithm are deduced and analyzed.On this basis,a multi-channel parallel receiving acquisition method is proposed to adapt to the short-time burst condition.This method improves the pseudo-code acquisition performance of the GMSK spread spectrum communication system by expanding the Doppler adaptation range.Applying this method to the shorttime burst GMSK spread spectrum communication system can increase the pseudo-code acquisition peak threshold by about 2.7 dB to meet the system sensitivity requirements,and occupy less hardware resources.

关 键 词：伪码捕获 多普勒频移 扩频通信 高斯滤波最小频移键控 

分 类 号：TN914.42[电子电信—通信与信息系统] V423.45[电子电信—信息与通信工程]