The local correlation processing method of DOR (Differential One-way Ranging) signal is introduced in detail. First, a priori delay model is calculated with orbit forecasts and the on-board emission frequency of DOR from the spacecraft is estimated with high-accuracy frequency estimation method. Then, the delay model and estimated frequency are used to construct the DOR local model signal, and the correlation phase is extracted through cross-correlation processing. The mathematical model for DOR signal local correlation processing is deducted. The method is validated through signal simulation. Simulation delay measurement accuracy is about 0. 1 ns when only the effect of random noise and orbit forecast error are taken into consideration. This provides a support to a technical approach for precise measurement of deep-space spacecraft.%详述了DOR(差分单向测距)信号的本地相关处理方法.首先根据轨道预报确定先验时延模型值,利用高精度频率估算方法估计航天器DOR信号的星上发射频率,然后通过时延模型值与频率估计值构造DOR本地模型信号,再将此模型信号分别与测站接收的DOR实测信号进行互相关运算,提取相关相位,解算高精度时延观测量.推导了DOR信号本地相关处理的数学模型,通过信号仿真验证了该方法的有效性,在仅考虑系统噪声影响与轨道预报误差的条件下,仿真时延测量精度达到0.1 ns,为深空航天器精密轨道测量提供了一种可借鉴的技术方法.
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