接近传感器测量环境中传感器和对象之间相对的距离。
A proximity sensor measures the relative distance between the sensor and objects in the environment.
这样做既提高了系统的经济性，简化了结构，又使得系统具有了同时测量目标距离、相对速度和方位角的功能。
The cost of the system is reduced and the structure is predigested, and it makes the detection system can measure distance, relative velocity and azimuth angle at the same time.
实验结果表明，该方法标定精度高，已标定传感器测量空间距离的相对误差优于0.3%。
It is shown that this method has high precision by experiment, and the measured relative error of space length excels 0.3%.
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