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Wide area differential method based on virtual reference star

A technology of virtual reference and differential station, which can be used in measurement devices, instruments, radio wave measurement systems, etc., and can solve problems such as application difficulties and short viewing time.

Inactive Publication Date: 2011-09-21
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

In the CAPS system, a wide-area difference method of separating the star clock and ephemeris is proposed, and a better difference effect is obtained, but there are great difficulties in the application of this method in the MEO constellation, because the MEO satellite is relatively It is fast-moving, and the visible time is short. It is not possible to use a fixed satellite as the reference star to complete the relative separation of ephemeris errors, but the reference star needs to be replaced frequently.

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  • Wide area differential method based on virtual reference star
  • Wide area differential method based on virtual reference star
  • Wide area differential method based on virtual reference star

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Embodiment Construction

[0031] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0032] attached figure 1 The basic framework of the differential network is given. The ground differential station includes two forms: the main station and the secondary station. The main station is used as a first-level differential station to maintain strict time synchronization with the system time. In China, for the GEO constellation, only need to establish 1 regional master station, for MEO constellation or mixed constellation, need to establish 2-3 regional master stations. Secondary stations do not require time synchronization, relatively many stations are built, and construction is relatively simple.

[0033] The position of each differential station is obtained through surveying and mapping in advance to obtain an accurate position.

[0034] The concrete steps of this embodiment are:

[0035] Carry out star clock error separation at the master station...

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Abstract

The invention relates to a wide area differential method based on a virtual reference star. The wide area differential method is technically characterized in that when time deviation between system time of a differential station and system time of a satellite navigation system exists, an actual satellite is replaced by a hypothetical satellite so that the virtual reference star completes relativeseparation of a radial ephemeris pseudo-range error in order to eliminate the error through a star single-error method. The invention mainly has the advantages that (1) the satellite navigation system is suitable for the construction of various kinds of satellite constellations and the method has popularity; (2) the construction cost of the differential system is low, and the construction cost, the operation cost and the maintenance cost at synchronous time are saved; (3) a real-time broadcast requirement on differential correction is satisfied for a real-time user with high differential positioning accuracy; and (4) the method has better sensitivity resistance to ephemeris abnormality so that the better differential effect also can be obtained when the ephemeris is abnormal.

Description

technical field [0001] The invention relates to a wide-area differential method based on a virtual reference star, relates to the technical field of satellite navigation system wide-area differential method research, and is a wide-area differential method suitable for improving the positioning accuracy of satellite navigation systems and suitable for various satellite navigation systems. difference method. Background technique [0002] Wide-area difference can eliminate various positioning errors in pseudo-range measurement, and is the most effective means to improve the performance of satellite navigation systems. However, the current research methods are all based on mid-orbit satellites such as GPS. my country's satellite navigation The system will use geosynchronous satellites (GEO), inclined high-orbit satellites (IGSO) and medium-orbit satellites (MEO) to form a global positioning system with a mixed constellation. Maneuvering control is implemented, so long-term data s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/14
Inventor 蔡成林李孝辉吴海涛张惠君王玉兰
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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