Improvement method of TCAR (Three-carrier Ambiguity Resolution) based on addition of graded small-sized search space under short base line

A search space and short baseline technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve problems such as low solution success rate, achieve small computational complexity, simple and easy-to-implement algorithms, and solutions. The effect of increasing the success rate

Inactive Publication Date: 2012-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the defect of low solution success rate of the traditional three-frequency integer ambiguity solution method (TCAR), and to provide an improved TCAR method based on hierarchical small-scale search space addition under a short baseline. In traditional TCAR, a small search space and a screening step are added to the last two stages of the process of approximating the ambiguity of the whole circle step by step, so as to keep the calculation time short and greatly increase the success rate of the solution

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  • Improvement method of TCAR (Three-carrier Ambiguity Resolution) based on addition of graded small-sized search space under short base line
  • Improvement method of TCAR (Three-carrier Ambiguity Resolution) based on addition of graded small-sized search space under short base line
  • Improvement method of TCAR (Three-carrier Ambiguity Resolution) based on addition of graded small-sized search space under short base line

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[0022] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0023] The overall flow chart of this method is as follows figure 1 As shown, it is a method based on hierarchically adding small ambiguity search space and improving the linear combination of three-frequency carrier phase to solve the integer ambiguity, which is suitable for the determination of carrier static or dynamic attitude information. In the specific solution, for simplicity of expression, a GPS system with a triple-frequency carrier will be taken as an example for illustration.

[0024] 1. Initial information acquisition

[0025] Obtain the orbital elements and perturbation parameters of GPS satellites from the ephemeris file, and determine the spatial coordinates of GPS satellites. According to the delay difference between the satellite signal and the receiver's replica signal, the distance between the satellite and the receiver is determined. Affect...

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Abstract

The invention discloses an improvement method of a three-carrier ambiguity resolution (TCAR) based on the addition of a graded small-sized search space under a short base line. The method disclosed by the invention comprises the following steps of: respectively adding a tiny search space in wide-lane and basic frequency-section ambiguity resolution determining phases according to a standard difference condition in a three-carrier phase linear combination process of a TCAR method; utilizing the length of the base line and structural configuration information to carry out primary screening; determining the unique integer ambiguity resolution through a residual minimum method; and finally, combining a dynamic carrier to solve a real-time posture of the carrier relative to an observation vector of a visible satellite and carrier wave single difference information. The method disclosed by the invention is applicable to positioning and determining the postures of signals of a three-frequency global navigation satellite system.

Description

technical field [0001] The present invention relates to a solution scheme based on a general three-carrier integer ambiguity. Aiming at the problem that the error is too large and the correct solution is easily missed in the process of rounding and estimating the ambiguity of the wide lane and the L5 frequency band in the scheme, each of the two key steps is added Small ambiguity search space, and each step through the prior antenna configuration information, filter the wrong results, reduce the final overall solution time, and finally deduce the real-time attitude of the carrier from the resolved ambiguity. It belongs to the field of satellite navigation positioning and attitude determination. Background technique [0002] With the development of satellite positioning and navigation technology, the technology of using satellite observation signals to realize real-time calculation of carrier attitude has become the focus of research in the field of satellite navigation, posi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/55
Inventor 杨迪曾庆化刘建业孙永荣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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