基于ARM+DSP的4G北斗定位平台的设计

针对如何提高北斗导航系统终端定位精度问题，提出了一种基于ARM+DSP架构并通过4G信号显示地图的北斗定位平台。其中DSP用来接收UM220-III发送的北斗信号，并使用无迹卡尔曼滤波算法修正定位结果；ARM接收DSP处理后的定位数据，通过嵌入式QT程序显示定位信息，当有4G信号覆盖时传至嵌入式BOA服务器上，调用百度API函数显示网络地图，当无4 G信号覆盖时通过mitab库调用.mif文件显示本地地图。经实验证明，本设计达到了提升北斗终端定位精度的要求。

A Design for 4G Beidou Platform Based on ARM + DSP Architecture

To solve how to improve the positioning accuracy of the Beidou navigation systems terminal, we raise a Beidou positioning platform based on ARM+DSP architecture and displaying map via 4G signal. DSP is responsible for receiving Beidou signal which UM220-III has transmitted, and using the UKF algorithm to amend the positioning result. ARM receives the data DSP has processed ,and displays positioning information through the embedded QT program. It displays the network map via Baidu API function when there exists 4G signal, and uses mitab library to call the mif files to display the local map when there is no 4G signal. The experimental results show that the design can achieve the requirements of improving the positioning accuracy of the Beidou terminal.