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GNSS occultation ionospheric residual correction method and system based on ionospheric electron density

An ionospheric residual and electron density technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, instruments, etc., can solve problems such as poor reliability and accuracy, and achieve the effect of improving accuracy and weakening influence

Active Publication Date: 2021-03-09
NAT SPACE SCI CENT CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the more advanced Kappa correction method is based on the assumption of neutral atmosphere and spherical symmetry of the ionosphere, ignoring the influence of the uneven distribution of electron density along the occultation signal path, and its reliability and accuracy are poor
[0007] To sum up, the ionospheric residual at the bending angle is the main factor restricting the high-precision inversion of GNSS occultation data in the altitude range of 25–60 km; the correction method of the ionospheric residual at the Kappa bending angle is based on the assumption of neutral atmosphere and spherical symmetry of the ionosphere. ignores the effect of uneven distribution of electron density along the occultation signal path, and is a simple statistical empirical model with poor reliability and accuracy

Method used

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  • GNSS occultation ionospheric residual correction method and system based on ionospheric electron density
  • GNSS occultation ionospheric residual correction method and system based on ionospheric electron density
  • GNSS occultation ionospheric residual correction method and system based on ionospheric electron density

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Embodiment 1

[0043] Such as figure 1 As shown, Embodiment 1 of the present invention provides a GNSS occultation ionospheric residual error correction method based on ionospheric electron density. The method takes into account the asymmetry of ionospheric electron density. The method includes the following steps:

[0044] S11. Obtain GNSS occultation geometric data and ionospheric data through data preprocessing;

[0045] In this embodiment, the GPS-MetOp occultation observation data and the vTEC maps data products issued by the IGS station are used for data processing and model verification. The basic input parameters mainly include GNSS occultation geometric input parameters, as shown in Table 1:

[0046] Table 1 Basic input parameters of the bending angle ionospheric residual correction model

[0047]

[0048] S12. Determine the ionospheric input parameters according to the observed data and the ionospheric model;

[0049] Comprehensively using the basic input parameters of the model...

Embodiment 2

[0066] Embodiment 2 of the present invention provides a GNSS occultation ionospheric residual correction system based on ionospheric electron density, said system comprising:

[0067] The preprocessing module is used to preprocess GNSS occultation raw observation data and ionospheric vTEC maps data, and obtain GNSS occultation geometric data and ionospheric data;

[0068] The electron density calculation module is used to calculate the electron density profile at the position of the ionosphere puncture point on the "incoming ray" and "outgoing ray" sides based on GNSS occultation geometric data, ionospheric data and three-dimensional NeUoG ionospheric model;

[0069] The residual correction module is used to calculate the curved angle ionospheric residual profile based on the GNSS occultation geometric data and the electron density profile.

Embodiment 3

[0071] Embodiment 3 of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the computer program, the computer program is implemented. Example 1 method.

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Abstract

The present invention provides a GNSS occultation ionospheric residual correction method and system based on ionospheric electron density. The method includes: preprocessing GNSS occultation raw observation data and ionospheric vTEC maps data, and obtaining GNSS occultation geometric data and ionospheric data; based on GNSS occultation geometric data, ionospheric data and three-dimensional NeUoG ionospheric model, calculate the electron density profile of the ionospheric puncture point on the "incoming ray" and "outgoing ray" sides; based on GNSS occultation geometric data and the electron density profile to calculate the curved angle ionospheric residual profile. The GNSS occultation ionospheric residual correction method and system of the present invention can be used in the inversion of atmospheric parameters of a single GNSS occultation event to weaken the influence of ionospheric residuals, thereby obtaining a higher-precision GNSS occultation bending angle profile, Efficient and reliable.

Description

technical field [0001] The application of the present invention relates to the field of GNSS radio occultation atmospheric detection technology and meteorology, in particular to a GNSS occultation ionospheric residual correction method and system based on ionospheric electron density. Background technique [0002] GNSS occultation detection technology can obtain vertical profiles of physical parameters such as high vertical resolution, high precision, no calibration, long-term stability, and all-weather physical parameters such as atmospheric refractive index, density, temperature, humidity, and pressure. [0003] The successive implementation of GNSS occultation detection programs has provided a new data source for global climate monitoring and numerical weather prediction. GNSS occultation data products have been applied to climate analysis on a 20-year time scale. The analysis results show that the temperature accuracy of a single occultation observation profile is better...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/07G01W1/00
CPCG01S19/07G01W1/00
Inventor 柳聪亮孙越强杜起飞白伟华王先毅蔡跃荣孟祥广夏俊明王冬伟李伟吴春俊刘成赵丹阳
Owner NAT SPACE SCI CENT CAS
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