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高动态GPS信号的载波跟踪方案研究及其仿真.doc


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1 高动态 GPS 信号的载波跟踪方案研究及其仿真刘晓琴, 徐长雷( 安徽农业大学经济技术学院,安徽合肥 230601) 摘要: 构造快速可靠的系统仿真平台、实现高动态载波跟踪对 GPS 接收算法的研究及硬件的设计提供有效的帮助。分析了多普勒频偏对 GPS 接收机的影响,并讨论了频偏的估计方法,提出了高动态下的自适应设置带宽的联合载波跟踪方案。相位跟踪部分增添了锁定/ 假锁检测机制,并分析了跟踪系统的各个环节。在 Matlab/Simulink 环境下, 实现了该载波跟踪方案的仿真。结果表明该仿真平台有效、可靠;也表明该方案具有较好的高动态跟踪和数据解调性能。关键字: 高动态;载波跟踪;仿真;环路滤波器;科斯塔斯环中图分类号: 文献标识码: A Research and Simulation of Carrier Tracking Method for High - Dynamic GPS Signals LIU Xiao-qin, XU Chang-lei (E conom y and T echnology Institute Anhui Agricultural University ,Anhui Hefei 230601) Abstract: C onstruct ing f ast and reliable system simulation platform and realizing high-dynamic carrier tracking provide s effective help to the research of GPS receive algorithms as well as the design of hardware. The influence of Doppler Frequency Shifts to GPS receiver is analyzed. An estimat ion method of frequency offset is discussed,and the joint carrier tracking scheme with adaptive bandwidth designed is locked/false-locked detection mechanism is added to the phase tracking part,and the aspects of the tracking system are analyzed. T he simulation of the carrier tracking on Matlab/simulink is realized. The result shows the availability and reliability of this platform ,and also shows the better high - dynamic tracking and data demodulation performance of the scheme. Key words: High dynamic;Carrier tracking;Simulation;Loop Filter;Costa

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  • 时间2017-01-24