Resolution method for differential phase integer ambiguity of radio interferometry of deep space explorer

Abstract

The invention belongs to the field of radio interferometry of deep space explorers and discloses a resolution method for differential phase integer ambiguity of radio interferometry of a deep space explorer. The method comprises the following steps: step 1, establishing a right-hand coordinate system (U,V,W); step 2, calculating a geometric phase difference of two measuring stations; step 3, carrying out differential processing on phase difference measured value of the explorer and a reference source; step 4, solving the differential phase integer ambiguity through a least square method. By adopting the resolution method provided by the invention, the problems of resolving the differential phase integer ambiguity of the radio interferometry when the quantity of ground measuring stations is less and the deep space explore only has a conventional remote measurement or data transmission downstream measurement and control signal is solved; the high-precision navigation and positioning precision of the deep space explorer is effectively improved.

Description

technical field [0001] The invention relates to the field of radio interferometry of deep space probes, in particular to a method for solving the ambiguity of the differential phase of the radio interferometry of deep space probes. Background technique [0002] In deep space exploration missions, it is necessary to carry out radio interferometry on the detector to obtain its precise spatial angular position (ie, right ascension and declination). Radio interferometry mainly determines the angular position of the detector by measuring the differential time delay between the detector signal and the reference source signal arriving at two far apart stations. The existing radio interferometry technology mainly obtains the differential group delay. When other conditions are constant, the wider the downlink signal bandwidth of the detector, the higher the measurement accuracy of differential group delay. However, the downlink signal bandwidth of the detector is limited by the fre...

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Problems solved by technology

[0003] Prior art [1] (see F Kikuchi, L Qinghui, H Hanada, et al. Pico-secondaccuracy VLBI of the two sub-satellites of SELENE (KAGUYA) using multi-frequency and same beam methods. Radio Science, 2009, 44 (2): 1-7) proposes a method of using detectors to send multiple sine wave measurement signals of specific frequencies, and then solving the differential phase integer ambiguity through frequency synthesis. The disadvantage of this method is that additional detection is required downlink power

[0004] The prior art [2] (see Zhou Huan, Li Haitao, Dong Guangliang. Research on the method of solving deep space spacecraft carrier phase ambiguity by using multi-baseline combination. Acta Astronautica Sinica, 2015, 36(8): 938-944) proposes to use multiple The length and point of the baselines are evenly distributed, and then the method of solving the differential phase integer ambiguity through the constraint relationship between the baselines, the disadvantage of this method is that at least 8 ground stations are required to observe simultaneously

Due to the fact that in the existing deep space exploration missions in our country, the number of usable stations is generally only 4, which cannot meet the conditions for the use of this method.

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