Method for measuring attitude of carrier by using additional constraint condition of GPS system

A technology of GPS system and additional constraints, applied in the field of GPS system

Inactive Publication Date: 2010-09-15
周迅
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Problems solved by technology

Unfortunately, the tri-frequency GPS receiver has not yet been widely used (civilian L 5 frequency start

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  • Method for measuring attitude of carrier by using additional constraint condition of GPS system
  • Method for measuring attitude of carrier by using additional constraint condition of GPS system
  • Method for measuring attitude of carrier by using additional constraint condition of GPS system

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Embodiment Construction

[0066] Using GPS for navigation and positioning needs to observe the signal transmitted by the satellite through the user receiver to obtain the distance from the satellite to the user. Because the satellite position can be obtained according to the ephemeris information, the user's position can be determined. Due to the influence of various error sources, the observation distance from the GPS satellite to the user does not truly reflect the geometric distance from the satellite to the user, but contains errors. This GPS measurement distance with errors is called pseudorange. Since the GPS satellite signal contains a variety of positioning information, the observations widely used are: the code observation and the phase pseudo-range observation, that is, the code observation and the carrier phase observation [69] .

[0067] GPS satellites use two ranging codes, C / A code and P code, both of which are pseudo-random codes. C / A code (Coarse / Acquisition) is used for rough ranging...

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Abstract

The invention relates to a method for measuring attitude of a carrier by using an additional constraint condition of a satellite, which comprises the following steps of: establishing a linearization carrier phase double-difference model for each baseline of an attitude measuring system, and determining the integer ambiguity; expanding a search space, and determining a trigonometric function constraint and a base length constraint; substituting a constraint condition containing the maximum boundary and the minimum boundary into a search process to obtain an upper bound and a lower bound of a formula ambiguity candidate value; performing a comparison according to the boundaries obtained in the search process and an original constraint, and selecting a smaller boundary as the boundary of the ambiguity; and selecting ambiguity candidate values, wherein if the ambiguity candidate values are more than one, two groups of the ambiguity candidate values with the minimum residual errors are selected to perform a verification of the next step, and the candidate values passing through a significance test are fixed solutions of the integer ambiguity. The attitude of the carrier is obtained by further using an attitude measurement algorithm through the fixed solutions. The method has the advantages of reducing the search times, reducing influences caused by noises and significantly improving the measuring accuracy and the success ratio.

Description

technical field [0001] The invention relates to a GPS system, in particular to an attitude measurement method of the GPS system. Background technique [0002] The full name of GPS is Navigation by Satellite Timing and Ranging (NAVSTAR) Global Positioning System (GPS). More and more countries and regions have not only invested huge manpower and material resources in GPS applied research and information resource development, but are also actively developing their own satellite navigation systems. In addition to the GPS of the United States, the Global Navigation Satellite System (GNSS) that has been applied so far, the GLONASS (Global Orbiting Navigation Satellite System) of Russia, the Galileo of Europe and China, and the Beidou system of China can all provide global or regional navigation systems. satellite positioning and navigation services. [0003] The attitude measurement technology using GPS is based on the principle of satellite carrier phase signal interferometry t...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S5/14
Inventor 周迅
Owner 周迅
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