Control Strategy and Implementation for Acquiring C/A Code of High Dynamic GPS Signals
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摘要: 为检测高动态GPS(Global Positioning System)信号,需要设计码环及载波环捕获与跟踪数字系统.尽量缩短盲捕时间,快速捕获到信号,是研制高动态GPS接收机技术的关键,而GPS信号C/A码的快速捕获是码跟踪和载波捕获与跟踪的基础.主要讨论了在高动态GPS信号C/A码捕获中,并行搜索法和串行搜索法的原理与实现,并结合GEC公司的十二通道相关器GP2021,给出基于DSP(数字信号处理器)技术用串行搜索法捕获高动态GPS信号C/A码的算法实现.Abstract: It is necessary to design acquisition and tracking system for code loop and carrier loop in order to detect high dynamic GPS signals. Acquiring signal quickly and shortening acquisition time in the cold case are the key technologies of high dynamic GPS receiver. Moreover, fast acquisition of C/A code is the base of code tracking and carrier acquisition and tracking. This paper describes elements and implementation of parallel search precept and sequential search precept to acquire C/A code of high dynamic GPS signal. And combined with a 12-channel correlator named GP2021 produced by GEC Co., the arithmetic implementation to acquire C/A code of high dynamic GPS signal used sequential search precept based on DSP technology is also given.
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Key words:
- pseudorandom codes /
- trapping /
- false alarms
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[1]Daffrara F,Vinson P.Improved search algorithm for fast acquisition in a DSP-based GPS receicer[J].IEEE Tran on Com,1998.310~314. [2]朱近康.扩展频谱通信及其应用[M].合肥:中国科学技术大学出版社,1993. 182~204. [3]孙 礼,王银锋, 何 川,等. GPS信号捕获与跟踪策略确定及实现[J]. 北京航空航天大学报,1999,25(2):134~137. [4]陆 娟. DSP技术在高动态GPS接收机中的应用 . 北京航空航天大学电子工程系,2000. -
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