Construction Method of Tropospheric Mapping Function Model to Characterize Atmospheric Anisotropy
A technology of mapping function and anisotropy, which is applied in the field of water vapor remote sensing, radio propagation, and satellite navigation, can solve the problems that are not enough to make up, and the azimuth angle cannot be included in it, and achieve the effect of overcoming the lack of accuracy
Inactive Publication Date: 2019-03-19
WUHAN UNIV
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However, the third-order continued fraction cannot take the azimuth into it
For this reason, the existing method uses the method of additional gradient parameter estimation to compensate, but the gradient only considers two parameters in the south-north and east-west directions, which is not enough to make up for the defects of the existing mapping function
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[0026] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.
[0027] The present invention provides a tropospheric mapping function model representing atmospheric anisotropy, the principle of which is shown in figure 1 , whose mathematical form is shown in formula (1):
[0028]
[0029] In formula (1):
[0030] MF(φ,θ) represents a mapping function model with azimuth φ and altitude θ as independent variables;
[0031] with is a coefficient, its value is to be determined;
[0032] N is satisfied The minimum integer of , α is the model resolution, and its unit is degree. The model resolution α is valued accord...
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The invention provides a building method for a troposphere mapping function model representing atmospheric anisotropy. The method comprises the steps of S1, collecting the meteorological data of the ambient space of an observation station; S2, according to the meteorological data, calculating the zenith tropospheric delay and the tropospheric slant delays under different azimuth angles and different elevating angles of the observation station by using the ray-tracing method; S3, calculating the ratio of each tropospheric slant delay to the zenith tropospheric delay separately; S4, building an error equation with the ratios as observation values; S5, obtaining the optimal solutions of the coefficients of a troposphere mapping function model by using the principle of least squares. The method integrates both the elevating angles and the azimuth angles of satellite signals, as independent variables, into a troposphere mapping function model, so that the differences of tropospheric delays under different elevating angles and azimuth angles can be accurately and completely expressed; being applied to satellite navigation positioning and water vapor detection, the built troposphere mapping function model can further improve the precision of satellite navigation positioning and water vapor detection.
Description
technical field [0001] The invention belongs to the technical fields of satellite navigation, water vapor remote sensing and radio propagation, and in particular relates to a method for constructing a troposphere mapping function model representing atmospheric anisotropy. Background technique [0002] The tropospheric delay is an important error source in the satellite navigation signal propagation process, and its value is about 2.3m in the direction of the zenith, and can reach 30m in the direction of the horizon. Tropospheric delay is non-dispersive in the radio band and cannot be eliminated by combining multiple frequency signals. The tropospheric oblique delay in any altitude direction is usually expressed as the product of the zenith delay and the mapping function. The existing mapping function models are all based on the assumption of spherical symmetry of the atmosphere, and most of them adopt the expression form of third-order continued fraction, expressing the map...
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IPC IPC(8): G06F17/50
CPCG06F30/20Y02A90/10
Inventor 章迪
Owner WUHAN UNIV