摘要
为检测高动态GPS(GlobalPositioningSystem)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GP2 0 2 1 ,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
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. 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.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2002年第3期358-361,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金资助项目 (60 0 2 70 0 1)
关键词
伪随机码
捕获
虚警
Digital signal processing
Parallel algorithms
Signal encoding
