摘要
GPS软件接收机相对传统硬件接收机,设计灵活,能够迅速分析、仿真、实现各类算法。本文主要针对GPS L1频率的C/A码信号,设计并实现了GPS软件接收机的基带处理部分,阐述了射频前端原理、并行码相位搜索捕获策略以及鉴频辅助跟踪环路,并推导了适应动态环境的三阶数字环路滤波器。仿真数据和实际中频数据测试表明:算法性能优越,能迅速捕获并锁定信号,获取导航数据。
Conventional GPS receivers provide limited user flexibility. It is necessary to have software GPS receivers for easy implementation, which can analyze, simulate and execute various algorithms rapidly. In our software receiver design, the focus is on the baseband signal processing of L1 band C/A code GPS signals. In the paper, we introduce the theory of RF front - end, the algorithms for parallel code phase search acquisition, and frequency discrimination aided tracking loop. We also present a third - order digital loop filter which is adaptive to dynamic environment. Simulation results demonstrate that the proposed algorithms can speed up the signal acquisition and tracking, and extract the navigation data bits from the original GPS signals.
出处
《电光与控制》
北大核心
2007年第1期115-119,共5页
Electronics Optics & Control
关键词
GPS软件接收机
捕获
跟踪
数字锁相环
software GPS receiver
acquisition
tracking
digital loop filter
