基于重叠缓冲预解跳的DS/FH扩频信号快速捕获  

Rapid Acquisition of DS/FH Spread Spectrum Signal Based on Double Buffer Pre-dehopping

作　　者：袁田 刘田[1] 苏新军[2] YUAN Tian;LIU Tian;SU Xinjun(Southwest China Institute of Electronic Technology,Chengdu 610036,China;China Xi′an Satellite Control Center,Xi′an 710043,China)

机构地区：[1]中国西南电子技术研究所,成都610036 [2]西安卫星测控中心,西安710043

出　　处：《电讯技术》2020年第7期815-819,共5页Telecommunication Engineering

摘　　要：DS/FH(Direct Sequence/Frequency Hopping)扩频信号捕获相对直接序列扩频(Direct Sequence Spread Spectrum,DSSS)需要更多维度的搜索,捕获电路复杂。针对现有DS/FH扩频信号捕获算法复杂度高、电路结构与波形参数强相关,以及通用性差、灵活度低的问题,提出了一种基于重叠缓冲预解跳的DS/FH扩频信号快速捕获方法,利用双缓冲补零(Double Block Zero Padding,DBZP)缓冲单元与预解跳单元的灵巧结合,将时域-频域-多普勒域高度耦合的扩跳频图案搜索进行降维分离,在保证积分增益的同时降低了捕获实现的复杂度。数值分析与仿真结果表明,所提方法兼顾了捕获性能与运算资源,相比现有基于预解跳方法的DS/FH扩频信号捕获算法的运算量减小了50%。Traditional direct sequence/frequency hopping(DS/FH)spread spectrum signal acquisition al-gorithm suffers from high complexity and poor flexibility,especially the much higher complexity of circuitdesign for the multidimensional search compared with direct sequence spread spectrum(DSSS)acquisition.In order to solve above problems,a rapid algorithm for DS/FH spread spectrum signal acquisition based onthe double buffer pre-dehopping is proposed.The algorithm reduces and divides the dimensions of the pat-tern search in time domain-frequency domain-Doppler domain by taking advantages of the flexibility of thecombination between the double block zero padding(DBZP)unit and the pre-dehopping unit.The pro-posed algorithm considers not only the acquisition performance but also the computing resource.Numericaland simulation results show that the computational efficiency of the proposed algorithm has been reduced by 50 percent compared with existing DS/FH spread spectrum signal pre-dehopping-acquisition algorithms.

关 键 词：DS/FH扩频 微弱信号捕获 重叠缓冲 预解跳 

分 类 号：TN914.4[电子电信—通信与信息系统]