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针对深空航天器高精度定位需求,提出多基线组合求解载波相位模糊方法,获得比群时延更精确的相时延,极大地提高无线电干涉测量精度。首先建立多基线组合求解载波相位模糊的数学模型,推导该方法对长短基线组合的约束条件。然后利用美国甚长基线阵(VLBA)对本文方法进行仿真校验,结果表明航天器定位精度可以达到纳弧度量级。最后结合我国已有干涉测量网,分析在我国未来深空探测任务中采用多基线组合测量载波相时延的可行性,给出满足方法约束的站址选择建议,可为我国深空导航无线电干涉测量技术的发展和深空测控网的完善提供参考。
In order to meet the needs of high-precision positioning of deep spacecraft, a multi-baseline combination method is proposed to solve the phase ambiguity of the carrier, and a more accurate phase delay than the group delay is obtained, which greatly improves the accuracy of radio interference measurement. First, a multi-baseline combination is established to solve the mathematical model of carrier phase ambiguity, and the constraint conditions for the long-short baseline combination are derived. Then the VLA method is used to verify the proposed method. The results show that the positioning accuracy of the spacecraft can reach the order of nano-arc. Finally, combining with the existing interference measurement network in our country, the feasibility of adopting multi-baseline combination to measure the carrier phase delay in China’s future deep space exploration mission is analyzed. The suggestions of site selection to meet the constraints of the method are given, which can be used for China’s deep space navigation radio interference Measurement technology and the development of deep space monitoring network to provide a reference.