High-precision real-time absolute orbit determination method

Abstract

The invention relates to a high-precision real-time absolute orbit determination method. Under the application background of high-precision real-time orbit determination of a satellite-borne receiver,with a pseudo-range and a carrier phase are used as the observed quantity of a filtering equation, state parameters such as satellite operation positions and speeds are stably output with high precision by using extended Kalman filtering and combining a highly nonlinear kinetic model. While the high-precision carrier phase observed quantity is fully utilized, various ways are adopted to improve the operation efficiency, the requirements of high-precision real-time orbit determination of medium and low orbits are met, the orbit determination and speed measurement precision is greatly improved.In addition, the method also has orbit prediction and extrapolation capabilities, so that the reliability of on-orbit output of the navigation equipment is improved to a great extent. The low-orbit satellite scene simulation real-time orbit determination test is carried out on the receiver platform, the technical indexes that the real-time absolute orbit determination position precision is superior to 0.5 m and the speed measurement precision is superior to 0.5 mm / s can be realized; and compared with a conventional pseudo-range real-time single-point positioning method, the provided method enables the orbit determination speed measurement precision to be greatly improved.

Description

technical field [0001] The invention relates to a high-precision real-time absolute orbit determination method, in particular to a high-precision real-time absolute orbit determination method based on pseudorange and carrier phase observations, which belongs to the technical field of satellite navigation and positioning and can be applied to various types of low-orbit satellites and payloads of manned spacecraft. Background technique [0002] With the continuous improvement of satellite independent and precise orbit determination requirements and the improvement of the performance of on-board processors, the application of GNSS in on-board orbit determination has developed extremely rapidly. On-board GNSS real-time orbit determination can provide real-time orbit data for the payloads of various medium and low orbit satellites and manned spacecraft, especially large-scale earth observation payloads. burden. Therefore, carrying out research on high-precision orbit determinat...

AI Technical Summary

Problems solved by technology

For satellite users, it is hoped that the receiver can continuously output stable and high-precision data under poor observation conditions, which cannot be achieved by geometrical orbits; at the same time, satellite users need the receiver to be able to predict a period of For satellite orbits outside the time (some need several hours), the geometrical orbit is also powerless

The pseudo-range dynamic orbit determination method uses the pseudo-range as the main observation value, combines the simplified dynamic model, and uses the extended Kalman filter to estimate the orbit parameters of the satellite. Due to the limitation of measurement noise and other factors, the accuracy of real-time orbit determination can only reach about 3.0m, which cannot meet the current high-precision real-time orbit determination requirements

The accuracy of the carrier phase observation is two orders of magnitude higher than that of the pseudorange, but if the dynamic orbit determination is based on the carrier phase, it is necessary to process the cycle slip and ambiguity of the carrier phase data in real time, and to detect the slip and resolve the ambiguity accurately and efficiently in real time. It is very difficult, which reduces the reliability of real-time carrier phase orbit determination; at the same time, with the increase of the filter dimension, the complexity of data processing is also greatly increased, and this method needs to occupy a large amount of computing resources. Higher requirements are put forward, which increases the difficulty for the realization of engineering applications

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