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Constellation Autonomous Orbit Determination Based on Lunar Libration Point Orbit

Author: WangDanDan
Tutor: DuLan
School: PLA Information Engineering University
Course: Astrometry and celestial mechanics
Keywords: Autonomous orbit determination SST Circular restricted three-body problem Halo orbit Stability Observability Ranging system deviation Combined Orbit Determination Accuracy Analysis
CLC: V412.41
Type: Master's thesis
Year: 2010
Downloads: 90
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Abstract


With the development of space science and technology, the libration point and its nearby periodic and quasi-periodic orbit has been more and more applications and attention. In the context of the lunar exploration boom, Halo orbit and orbit around differences in force model and its unique space configuration, in the case of the absence of ground support aircraft by the lunar LEO LMO and Halo orbit composed of two star constellations, the SST constellation autonomous orbit determination of the feasibility of the use of inter-satellite observation, provide a new way to determine precise orbit exploration of the moon and gravity field inversion task (especially the far side of the moon). The main conclusions of the paper are: 1, the introduction of the stability factor and linear stability of the order of two indicators to determine the stability of the periodic orbits, analysis the Halo orbit motion stability of the family in the vicinity of the Earth-Moon system L1 and L2, in the constellation Halo The selection of the track to provide a reference. From the force model and track form depth Halo orbit with the traditional two-body orbit essential difference revealed and by numerical simulation the the LMO-LL2Halo constellations and the LMO-LL1Halo constellation system observability. 3, based on the double impact of the movement and structural stability, examines the of Halo orbit selection of orbit determination accuracy. First of all, the constellation autonomous orbit determination accuracy and stability of motion of the Halo orbit family is closely related to the Second, even if the stable order of 0 (best) Motion Stability some Halo orbit, the closer the distance of the moon, the structural stability of the system worse, the orbit determination results worse. 4, simulation and analysis of autonomous orbit determination accuracy of the LMO-LL2Halo constellation. Only ranging observations and ignore the deviation of the ranging system using 10-day orbit determination arcs the constellation the LMO satellite in orbit determination accuracy of better than Halo satellite orbit determination accuracy. The LMO satellite orbit determination accuracy in the R / T / N direction in meters, Halo satellite better than 20m, T direction of the worst accuracy. Track extrapolated to 15 days, the LMO orbit determination accuracy is still in meters, Halo satellite orbit determination accuracy in the one hundred meters. 5, the use of additional a priori information to improve the characteristics of the ranging system deviation from calibration capability. Ranging system deviation in less than 30 meters, the LMO satellite orbit determination accuracy at the meter level, Halo satellite orbit determination accuracy better than 30 meters. Track extrapolated to 15 days, little change LMO satellite orbit determination accuracy are maintained in meters, Halo satellite orbit determination accuracy is affected by the impact of the deviation of the ranging system. Ranging system the smaller the deviation, the better the results of orbit determination. When the the ranging system deviation of 10 meters, Halo satellite orbit determination accuracy within a hundred meters. 6, ranging concept of measurement with the concept of speed measurement Combined Orbit Determination concept of speed, accuracy measurement can improve the accuracy of orbit determination. Results of orbit determination by gun concept of measurement accuracy; gun concept measurement accuracy of 1mm / s, ranging system deviation has little effect on the results of orbit determination.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Basic theory and experiments > Flight Mechanics > Spacecraft flight mechanics > The orbit of the spacecraft ( including satellites )
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