A real-time precise orbit determination method for short-arc low-orbit navigation satellites

Abstract

The invention discloses a real-time precise orbit determining method of a short orbit arc low earth orbit (LEO) navigation satellite. The method is characterized in that four or more ground receivers are used for tracking navigation signals of a plurality of GNSS (Global Navigation Satellite System) navigation satellites and LEO navigation satellites, and transmitting the navigation signals to a data center in real time. The method comprises the following steps: I, acquiring and preprocessing observing data; II, performing precise time synchronization on the receivers; III, calculating tropospheric delay in an LEO gazing direction by using tropospheric delay in a vertical direction and a projection function; IV, correcting hardware delay of the receivers to build an LEO determining geometric observing equation; V, solving an LEO precise orbit and a precise clock error through a dynamical model and the geometric equation of the LEO; VI, distributing the LEO precise orbit and the precise clock error in real time. By adopting the method, the problem of need of post-processing due to incapability of calculating the precise orbit of a low earth orbit satellite can be solved.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a real-time and precise orbit determination method for short-arc low-orbit navigation satellites. Background technique [0002] Low-orbit satellites and microsatellites are gaining more and more favor due to their low launch and manufacturing costs. Low-orbit satellites have made great contributions to communication, remote sensing, resource management, and space reference maintenance, and their applications have also expanded from traditional earth observation to navigation. Therefore, more and more low-orbit satellite launch plans have been proposed. on the agenda. The well-known Iridium project completed the networking of the global satellite communication system based on low-orbit satellites through 66 low-orbit satellites, and announced its satellite timing and location service (STL) plan in 2016, announcing that navigation satellites have entered l...

AI Technical Summary

Problems solved by technology

Post-processing LEO precision orbit determination accuracy can reach 2-5cm, but due to the limited download window of on-board observation data, it is difficult to achieve real-time download

In addition, post-processing usually uses batch least squares to determine orbits. This algorithm has high precision, but it is only suitable for post-processing or near real-time processing.

In view of the above reasons, post-processing LEO precise orbit determination cannot meet the needs of real-time orbit determination

[0004] To sum up, the existing low-orbit satellite orbit determination methods cannot provide real-time high-precision LEO orbit information, and cannot meet the needs of low-orbit satellite navigation to obtain high-precision orbits in real time.

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