基于车载导航系统四大要素概述

An Overview of the Four Elements based on Car Navigation Systems

针对车载导航系统,本文主要详述其四大要素:卫星信号、信号传播、信号处理和地图数据库,阐述它们的内容与相互之间的关系。卫星信号是由环绕地球的24颗卫星以一定的格式发射的,在传播过程中经过电离层、对流层然后被GPS接收机接收。接收机根据已编好的程序对信号的各种误差进行消除与减弱处理,并解算汽车位置坐标与行驶速度等数据。最后与存储在系统中的地图数据库相匹配,进行查询未知地点,选择最佳路径等,从而指导汽车行驶。

For car navigation systems, this article recounts the content of its four elements： satellite signals, signal propagation, signal processing, map databases and the relationship between them. The satellite signal ：is to launch by 24 satellites around the Earth to a certain format. It across through the ionosphere, troposphere in the communication process and then the signal is received by the GPS receiver. The receiver eliminates and weakens the variety of signal error by the software had been programmed and calculates the data of the coordinate and speed of the car. At the last, we can query the location, find the best path through matching the map databases in order to Guide vehicle traveling.