时移短时相关法在DSSS码捕获系统中的应用
doi: 10.3724/SP.J.1146.2005.01637
Application of DSTC to Code Acquisition System of DSSS
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摘要: 该文提出了将时移短时相关法应用于直接序列扩频(Direct Sequence Spectrum Spreading，DSSS)码捕获系统中。首先分析了码频频偏对捕获性能的影响，在折中考虑算法复杂度及捕获性能的基础上，提出了应用时移短时相关法进行码频频偏补偿，给出了捕获系统的实现方案；分析并比较了应用时移短时相关法前后捕获系统的检测概率，结果表明，应用时移短时相关法可大大提高捕获系统的检测概率。该文对高动态低信噪比条件下进行码捕获有重要的意义。Abstract: The article provides applying DSTC(Deskewed Short-Time Correlator)to code acquisition system on serious code frequency offset. Firstly, performance of acquisition system affected by code frequency offset is analyzed. Considering complication and performance of algorithm, code frequency offset is compensated by using DSTC. Secondly, specific and realizable solution of code acquisition system is given. Finally, probability of detection of acquisition system before applying DSTC is compared with that after applying DSTC, And it is confirmed that applying DSTC can greatly improve probability of detection, which is important for code acquisition in low signal-to-noise rate.
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