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Precise point positioning (PPP) method based on inter-satellite combination difference

A precision single-point positioning and inter-satellite technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as complex models and fluctuations

Inactive Publication Date: 2011-06-15
SOUTHEAST UNIV
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Problems solved by technology

The advantage of the UofC model is that it reduces the noise error and residual error. The ionospheric combination in the model retains the integer characteristics of the two frequency ambiguities and reduces the number of unknown parameters. There are fluctuations in the process, and the convergence speed also takes about 30 minutes

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  • Precise point positioning (PPP) method based on inter-satellite combination difference
  • Precise point positioning (PPP) method based on inter-satellite combination difference
  • Precise point positioning (PPP) method based on inter-satellite combination difference

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Embodiment Construction

[0056] (1) According to the observation files obtained by the GPS receiver, the observation equation of the GPS precise point positioning of the ionosphere depletion combination is listed:

[0057] ① The observation values ​​of the dual-frequency GPS receiver mainly include four types: C1, L1, L2, and P2. Among them, L1 and L2 represent the carrier phase observation values ​​on the L1 and L2 carriers respectively, C1 represents the C / A code pseudo-range observation values ​​on the L1 carrier, and P2 represent the P code pseudo-range observation values ​​on the L2 carrier respectively. The observation equation of GPS precise point positioning is:

[0058] L i s ( Φ j ) = ρ s ( i ) - cd T s ( i ) ...

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Abstract

The invention discloses a precise point positioning (PPP) method based on inter-satellite combination difference, comprising the following steps: firstly subtracting by utilizing an observation equation among different satellites with the same epoch so as to form a primary inter-satellite difference observation equation; then on the basis of primary inter-satellite difference, subtracting again by utilizing an observation equation between adjacent epoches so as to form a secondary difference observation equation among the inter-satellite epochs; and finally taking an observation station coordinate and a weight matrix which are solved based on the secondary difference equation as an initial value of a Kalman filter and taking a primary inter-satellite difference as a function solving model, using a Kalman filter method to solve the parameters such as the observation station coordinate and ambiguity and the like, and realizing PPP based on the inter-satellite combination difference. In the method disclosed by the invention, the resolving of PPP can be realized in short time, and the engineering realization is fast, stable and easy; and tests show that as a new model for positioning,the centimeter level can be achieved, and the convergence time is improved by 30% compared with the that of conventional model.

Description

technical field [0001] The invention relates to the selection of a function model in GPS precise single-point positioning, in particular to a precise single-point positioning (PPP) differential model solution positioning method, which belongs to the field of GPS precise single-point positioning. Background technique [0002] GPS precise single-point positioning technology is a popular technology in the field of satellite positioning at present. It is another research hotspot after GPS network differential positioning technology, and has broad application prospects. [0003] Precision single-point positioning technology only needs one receiver to perform static or dynamic independent operations on a global scale to achieve the purpose of precise positioning. The characteristics of low cost and high efficiency enable it to maintain high precision in the regional high-precision coordinate frame. Navigation and positioning have unlimited application prospects. Compared with the...

Claims

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Application Information

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IPC IPC(8): G01S19/44
Inventor 高成发陈伟荣沈雪峰
Owner SOUTHEAST UNIV
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