微小卫星星间测距在轨零值标定方法及应用

针对双程伪码辅助载波测距系统零值高精度标定的需求，提出一种适用于微小卫星星间测距系统在轨零值自标定的方法。该方法将测距单板的发射信号转化为接收信号，采用原有的测距算法获取测距单板的自身零值。基于该方法研制了相应的零值标定装置，实现零值测量模式和星间距离测量模式的切换。并采用实验的方法，对比不同信号强度及温度情况下的标定效果。实际测试表明，该方法所测零值稳定、结果可靠性高，同时具有较好的误差补偿效果，可作为一种新的在轨零值标定方法，其零值标定结果的不确定度可达0.18mm(2σ)。

On Orbit Delay Calibration of Inter Satellite Ranging System andIts Application for Micro Satellite

Aiming at the requirement of the high-precision delay calibration of a two-way pseudo-random code-aided carrier-based ranging system, a method of on-orbit delay self-calibration which is suitable for the inter-satellite ranging system of micro-satellite is proposed. The method transforms the ranging board’s transmitting signal into receiving signal and gains the board’s delay itself by employing the original location algorithm. The delay calibration device is developed based on this method, which makes it possible to switch between the delay calibration mode and the ranging mode. Comparisons of calibration effects in case of different circumstances of signal intensity and temperature are made by experiments. The experiments demonstrate that its result is of high stability and credibility, and it also has a good performance on error compensation. As a new one, the delay calibration method adapts to the inter-satellite two-way pseudo-random code-aided carrier-based ranging system and the uncertainty of calibration measurement can be 0.18mm (2σ).