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Positioning method based on epoch-satellite difference constraint

A technology of differential constraints and positioning methods, which is applied in the field of satellite navigation and positioning, can solve the problems that the high-precision characteristics of observations cannot be used, and achieve the effects of making up for inaccurate dynamic models, achieving positioning accuracy and convergence speed

Active Publication Date: 2017-05-31
HARBIN ENG UNIV
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Problems solved by technology

However, because the carrier phase observations contain unknown integer ambiguity measures, the high precision characteristics of the observations cannot be used

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  • Positioning method based on epoch-satellite difference constraint
  • Positioning method based on epoch-satellite difference constraint
  • Positioning method based on epoch-satellite difference constraint

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Embodiment Construction

[0016] In order to make full use of the high-precision characteristics of carrier phase observations to obtain centimeter-level or even millimeter-level motion increment information between epochs and realize accurate prediction of the state of the system dynamic model, the present invention provides an epoch-inter-satellite differential constraint Precise dynamic positioning algorithm. The algorithm eliminates errors such as receiver clock error, satellite clock error, ionosphere, troposphere, and hardware circuit deviation between observations through the epoch-to-satellite difference, and solves the unknown carrier phase through the integer optimal search algorithm. The integer ambiguity value of , recovers the high-precision characteristics of the carrier phase. Utilizing the high-precision inter-epoch motion incremental information provided by the carrier phase observations that restore the ambiguity of the entire cycle, it can provide a constraint information for the exi...

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Abstract

The invention belongs to the technical field of satellite navigation and positioning, and relates to a positioning method based on epoch-satellite difference constraint. The positioning method enhances the intensity of a satellite navigation system model and improves the convergence speed of a system. The positioning method provided by the invention comprises the steps that (1) observation acquired by a receiver is used for precise single point positioning to acquire the initial solution of the position of a user; (2) the observation of two adjacent epochs is used for first difference to acquire single difference observation; and (3) a satellite is selected as a reference satellite, and second difference between satellites is carried out on the single difference observation acquired in the step (2) to acquire double difference observation. According to the method proposed by the invention, epoch-satellite difference is carried out the original observation of the receiver; the whole-week characteristic of double difference ambiguity is recovered; and accurate inter-epoch position increment is acquired.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to a positioning method based on epoch-inter-satellite difference constraints that enhances the model strength of a satellite navigation system and improves the convergence speed of the system. Background technique [0002] In the high-precision satellite dynamic navigation and positioning technology, the optimal estimation algorithm is usually used to meet the consistency of the system model and observation data drive, so as to achieve the best navigation performance. However, most optimal estimation algorithms such as the Kalman filter algorithm usually need to establish an accurate system model in order to exert the optimality of the estimation algorithm. In satellite navigation and positioning technology, the constant velocity model and the constant acceleration model are widely used, and in order to describe the motion state of the carri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 李亮张艺贾春赵琳崔鹏
Owner HARBIN ENG UNIV
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