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Method for increasing satellite precise point positioning precision and convergence rate

A technology of precise single-point positioning and convergence speed, applied in the field of satellite navigation and positioning, it can solve the problems such as the limited application range of the equal-weight stochastic model, the inability of the equal-weight stochastic model to meet the accuracy requirements, and the inability to effectively reflect the correlation of observations. The effect of high positioning accuracy and stable filtering convergence

Inactive Publication Date: 2012-01-18
SOUTHEAST UNIV
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Problems solved by technology

[0009] However, the equal-weight stochastic model is not widely used, and the equal-weight stochastic model cannot meet the accuracy requirements in many engineering situations; and a single stochastic model with altitude angle or CNR as a parameter cannot effectively reflect the correlation between observations

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  • Method for increasing satellite precise point positioning precision and convergence rate
  • Method for increasing satellite precise point positioning precision and convergence rate
  • Method for increasing satellite precise point positioning precision and convergence rate

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0024] The invention constructs a fixed-weight random model based on the satellite altitude angle combined with the carrier-to-noise ratio, and simultaneously considers the influence of the satellite altitude angle and the satellite carrier-to-noise ratio on the precision of the observation value. On the basis of the exponential function model based on the fixed weight of the satellite altitude angle, a scale factor is added, and the value of the scale factor depends on t...

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Abstract

The invention discloses a method for increasing satellite precise point positioning precision and convergence rate, i.e., a combination weighting method for combining a satellite elevating angle with a carrier to noise ratio to determine a random model of phase observation values. Aiming at correlation among GPS precise point positioning observation values, a proportional factor is added on the basis of an exponential function model of an elevating angle weight determination method, the value of the proportional factor reflects observation signal carrier to noise ratio information. According to the method provided by the invention, satellite precise point positioning precision can be increased and precise point positioning one-point positioning rapid stable solution can be realized. Meanwhile, the method is easy for engineering realization. Tests prove that the GPS precise one-point positioning initial convergence rate (speed converging to reach dm grade positioning precision) can be remarkably increased by using the random model, and the speed converging to reach cm-grade positioning precision is slightly increased.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning, in particular to a method for improving the accuracy and convergence speed of satellite precise single-point positioning. Background technique [0002] In 1997, Zumberge et al. of JPL first proposed the idea of ​​precise single point positioning, the so-called PPP (Precise Point Positioning). The precision single-point positioning technology has fundamentally changed the concept of using "differential GPS" to achieve high-precision dynamic positioning, and truly realized the dream of using a single receiver for high-precision seamless observation around the world, and can directly obtain high-precision ITRF (International Terrestrial Reference Frame) coordinates. Therefore, once this technology was proposed, it attracted a large number of domestic and foreign scholars to study, and it has become a research hotspot in the field of GPS. [0003] There are many error correction ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/35
Inventor 高成发陈伟荣沈雪峰吴菲
Owner SOUTHEAST UNIV
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