摘要
捕获跟踪环路的设计是GPS接收机设计中的关键技术之一。本文首先阐述了扩频通信系统中捕获与跟踪的基本原理;重点阐述了GPS信号捕获跟踪通路的整体设计方案,详细论述了捕获跟踪模块中初始态、捕获态、同步态及保护态的设计及实现;最后给出了仿真结果和基于FPGA验证的测试数据。运行结果表明设计的捕获跟踪环路功能正常,性能可靠,可完成GPS信号的捕获和跟踪。
The design of signal acquisition and tracking loops is the key technique in designing the GPS receiver. This paper firstly presents fundamental principle of signal acquisition and tracking in the spread spectrum system. Then it presents with the emphasis on overall design of signal acquisition and tracking loops of GPS, and with details at the module design and implementation of state machine, including initial state, acquiring state, synchronizing state and protecting state. In the end, it gives the simulation result and test dates from FPGA. The simulation and operation results confirm that the design of signal acquisition and tracking loops is effective and reliable.
出处
《电子测量技术》
2009年第2期36-39,共4页
Electronic Measurement Technology
关键词
GPS
扩频
捕获跟踪
FPGA
GPS
spread spectrum
signal acquisition and tracking
FPGA
