Precise and synchronous positioning and time-keeping method and system of Mars orbiting detector

Abstract

The invention discloses a precise and synchronous positioning and time-keeping method and system of a Mars orbiting detector. The precise and synchronous positioning and time-keeping method comprises the following steps: firstly inputting initial data including a simulated nominal orbit and relative parameters for filtering initialization; simulating observation data, and simulating the observed quantity of a pulsar according to a measurement equation of the pulsar, wherein measurement noises relative to the observed quantity comprise clock errors, and the clock errors are simulated by a clock error model; and performing adaptive Kalman filtering according to a filtering state equation and an observation equation of self-positioning and time keeping of the Mars orbiting detector to obtain orbits and the clock errors of the detector. According to the precise and synchronous positioning and time-keeping method and system disclosed by the invention, on the basis of establishing an observation model of an X-ray pulsar, the observation model, a detector kinetic model and the clock error model of a satellite-borne atomic clock are organically combined, and the position, speed and clock error parameters of the detector are also estimated so as to ensure that the clock error correction can be achieved, influences of the clock errors to the positioning accuracy can also be weakened, and the self-positioning accuracy can also be improved.

Description

technical field [0001] The invention relates to the technical field of Mars exploration, in particular to a method and system for precise synchronous positioning and timing of ring fire detectors. Background technique [0002] For the Mars orbiting probes performing Mars exploration missions, real-time and high-precision acquisition of relevant information such as the position, speed, and attitude of the probes is not only the basis for precise navigation and control of the probes, but also the basis for ensuring various scheduled scientific experiments. It is one of the decisive factors for the smooth implementation of exploration missions. [0003] The long distance between Mars and the Earth and the complex space environment faced by the probes are a huge challenge to the traditional navigation methods based on ground measurement and control communication stations. The autonomous navigation of spacecraft will be one of the key technologies to break through this bottleneck...

AI Technical Summary

Problems solved by technology

[0031] To sum up, when the orbit dynamics model of the ring fire detector is used for orbit extrapolation, the accuracy of the extrapolated orbit is directly affected by the accuracy of the orbit dynamics model and the orbit integration method. In addition, if there is an error in the initial orbit parameters, the external push track will soon diverge

From formula (1-8), it can be seen that if the clock error correction is not performed regularly, the clock error of the atomic clock will cause damage to the positioning accuracy

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