Research on Lunar Four-Way Relay Measurement Mode of Orbit Determination and Positioning Method

Abstract

To deal with the limitation of the measurement and control link caused by occlusion in the detection in the lunar south polar region，a scheme of simultaneously applying two four-way relay measurement models was designed and the role of two-way and four-way measurement models in the lunar probe orbit determination and positioning in terms of the combination of observations and noise level was analyzed，The results show that simultaneous application of the two four-way models has better constraints on the orbiting accuracy of the two satellites，the relay satellite is more sensitive to the noise of the two-way model，the noise sensitivity of the low-orbit satellite and the lander is related to the number of four-way observations，and the positioning accuracy of the lander is related to the orbiting accuracy of the two satellites，which can provide a reference for the application of the relay measurement model in the fourth phase of the lunar exploration project.

Key words： precise orbit determination; lander positioning; relay satellite; low-orbit satellite; four-way relay measurement model

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