A method and system for spatial positioning and time synchronization

Abstract

The invention discloses space positioning and time synchronizing methods and a space positioning and time synchronizing system, and solves the problems that a spatial high-speed moving platform is low in time synchronizing and space positioning precision and cannot ensure the instantaneity. The space positioning method is used to measure relative positions of auxiliary and main stations, the main station comprises a main antenna, a first sub antenna and a second sub antenna, the main antenna emits a range finding signal, the auxiliary station receives the range finding signal, mixes the range finding signal with a local oscillation signal of the auxiliary station and emits a response signal, the main antenna and the first and second sub antennas receive the response signal and mix the response signal with a local oscillation signal of the main station, and the position of the auxiliary position is calculated according to the mixed signals of the auxiliary and main stations. The time synchronizing method is used to calculate a time difference between the main station and the auxiliary station according to the mixed signals of the auxiliary and main stations. Thus, a Doppler effect caused by high-speed movement of the platform can be inhibited effectively, the time synchronizing and space positioning precision is improved, the measuring instantaneity is improved, and system equipment is easy to realize.

Description

technical field [0001] The invention relates to a space positioning and time synchronization method and system. Background technique [0002] In the time synchronization technology between existing platforms, the two-way comparison method using the pseudo-code spread spectrum waveform system is widely used, but when the platform is in a high-speed motion state, the Doppler phenomenon generated by high-speed motion will affect the pseudo-code. The capture of the initial pulse has a relatively large impact, and it is also very difficult to estimate the carrier frequency. The existing space positioning technology between platforms includes the positioning method based on the time difference of arrival. This method measures the time difference between the arrival of the target at the main station and the secondary station, and performs positioning according to multiple hyperboloid intersection models. However, this method requires multiple grounds with known positions. Station ...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a space positioning and time synchronization method and system to solve the problems of poor time synchronization and space positioning accuracy of a high-speed moving platform in space, and the inability to guarantee real-time performance

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