当汽车在开行当中时，跟踪设备用三个或四个GPS卫星以三角形定位，然后持续地通过无线电数字传输目标所在的坐标位置。
As the target drives around, the tracking device triangulates its position from three or four GPS satellites, and digitally transmits its coordinates continuously by radio.
利用数字控制技术对位置信号误差角进行了实验检测及校正。
It has made experiment detection and rectification with signal control technology for the position signal error.
通过对自整角机原理的认真分析，根据实际系统的应用环境开发了一套新型的自整角机位置信号数字化模型。
A new digitized model of position signal for a set of selsyn system is developed according to the principles of selsyn and the application environment of actual system.
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