基于遥测PCM接收通道的光电经纬仪外引导

External Guide For Photoelectric Theodolite Based on Telemetry PCM Receiving Channel

在飞行试验中光电经纬仪主要用于获取飞机及外挂物的运动参数,由于被测目标距离较远或被遮挡时难以快速捕获目标,通常需要利用外引导方式辅助光电经纬仪进行对目标的捕获。飞机上加装GPS接收机后,可实时获取其大地坐标数据,对该数据实时采集并通过PCM遥测通道进行编码传输,地面接收该信号能够解调出飞机的实时位置坐标。通过在光电经纬仪上集成遥测PCM接收通道,实时接收机载下传的PCM信息流,提取出飞机的大地坐标数据,经数据处理后转发给光电经纬仪控制系统,驱动光电经纬仪快速捕获目标,从而能够实现对光电经纬仪的外引导。通过对引导数据的分析表明,引导精度能够满足光电经纬仪对目标快速捕获的需求,利用该技术在实际应用中取得了良好效果。

The motion parameters of aircraft and its external store can be obtained by photoelectric theodolite in flight test, but due to large distance measured or target blocked, it＇s difficult to capture target very fast. After adding GPS receiver on the aircraft, we can get geodetic coordinate in real time. After the real-time acquisition data coded thought the telemetry channel, the ground machine can demodulate coordinate of the aircraft .The PCM data Stream can be received from the airborne transmission stream through the PCM telemetry receiving channel which is integrated on photoelectric theodolite. At the same time, the geodetic coordinate of aircraft can be demodulated from the data stream in real time. By this way, the external guide for photoelectric theodolite can be achieved after the data processed and transmitted to the control system of photoelectric theodolite. Application results show that the guided precision has good performance in the remote target capture and good results in practical application of this technique for photoelectric theodolite.