GNSS random model building method considering troposphere residual delay

A stochastic model and building method technology, applied in the field of satellite navigation and positioning, can solve problems such as affecting the accuracy of observation values, and achieve the effect of reducing the impact and improving the accuracy and reliability

Active Publication Date: 2020-06-12
SOUTHEAST UNIV
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Problems solved by technology

In view of the deficiencies in the prior art, the present invention provides a GNSS stochastic model establishment method that takes into account the residual delay of the troposph

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  • GNSS random model building method considering troposphere residual delay
  • GNSS random model building method considering troposphere residual delay
  • GNSS random model building method considering troposphere residual delay

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0035] The invention provides a GNSS stochastic model establishment method taking into account the residual delay of the troposphere to solve the problem that the existing model is difficult to reflect the unmodeled error in precise single point positioning. The invention considers the tropospheric residual delay in the stochastic model, and uses the tropospheric residual delay to reflect the variance of the satellite, thereby increasing the reliability of observation data and improving the accuracy of precise single point positioning.

[0036] A GNSS stochastic model building method taking into account the residual delay of the troposphere, such as figure 1 As shown, it specifically includes the following steps:

[0037] Step 1: Determine the tropospheric thickness H in the direction of the zenith according to the position of the station, and ...

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Abstract

The invention discloses a GNSS random model establishing method considering tropospheric residual delay, and belongs to the field of satellite navigation and positioning. The propagation distance of asatellite signal in the troposphere is calculated through a satellite elevation angle and zenith troposphere thickness; a zenith mapping function is given to calculate tropospheric residual delay, then tropospheric residual delay is brought into a random model to give a method for calculating satellite observation value variance, the characteristics of unmodeled errors are effectively reflected,and precision and reliability of precision single-point positioning can be improved. The method specifically comprises the following steps: (1) determining the troposphere thickness H in the zenith direction according to the position of an observation station, and obtaining a satellite elevation angle E; (2) calculating a propagation distance S of the satellite in a troposphere; (3) calculating aspecific value k of the zenith mapping function; (4) determining the tropospheric residual delay amount; and (5) determining the variance of the satellite according to the tropospheric residual delay.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning, relates to the problem of satellite positioning accuracy, and mainly solves the problem of reasonably weakening the influence of tropospheric residual delay in satellite observation values ​​on the positioning accuracy. Background technique [0002] Precise point positioning (PPP) integrates the technical advantages of standard single point positioning and relative positioning, and achieves centimeter-level or even millimeter-level positioning accuracy, and has been widely used in many fields. Since the calculation accuracy of the satellite has a strict mathematical relationship with the stochastic model, determining a reasonable stochastic model for the observations can effectively reduce the influence of various system residual errors and improve the positioning accuracy. [0003] Commonly used stochastic models mainly include equal weight model, height angle fixed weight mod...

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Application Information

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IPC IPC(8): G01S19/07G01S19/40
CPCG01S19/07G01S19/40
Inventor 于先文赵刚
Owner SOUTHEAST UNIV
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