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针对近距航天器测距的需要,将CCSDS(空间数据系统咨询委员会)近距-1协议的定时业务与微波双向单程测距法相结合进行测距。该法以直序扩频技术来获得高精度传输帧ASM(附属同步标识)最后1位下降沿的时刻,并以时间码形式,通过帧数据域在测距星之间相互对传,综合考虑协议给出的信号物理特性,对所给出的方法进行了误差分析。分析表明,航天器之间距离不远,相对速度不大时,该法具有较高精度,且与数据通信共用1套设备,降低了成本。
In view of the need of close spacecraft ranging, CCSDS (Spatial Data Systems Advisory Committee) short-range-1 protocol timing services and microwave two-way one-way distance measurement method for distance measurement. This method uses the direct sequence spread spectrum technique to obtain the timing of the falling edge of the last 1 bit of the high-precision transmission frame (ASM) and transmits the data in the time domain to the ranging stars via the frame data field. Considering the protocol Given the signal of the physical characteristics of the given method of error analysis. The analysis shows that when the spacecraft is not far away from each other and the relative speed is not high, the method has high precision and shares 1 set of equipment with data communication, reducing the cost.