GNSS occultation ionospheric residual correction method and system, device and storage medium

An ionospheric residual and ionospheric technology, which is applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc., can solve the problem of poor reliability and accuracy, and does not consider the bending of the electron density distribution of a single occultation event. The influence of the angular ionospheric residual error and other issues can improve the accuracy, weaken the influence, and achieve the effect of high precision.

Active Publication Date: 2019-09-24
NAT SPACE SCI CENT CAS
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  • Summary
  • Abstract
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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, without considering the specific distribution of electron density along the signal path of a single occultation event and the influence of the geomagnetic field on the ionosphere residual of the bending angle, and its reliability and less accurate
[0004] To sum up, the bending angle ionospheric residual is the main facto

Method used

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  • GNSS occultation ionospheric residual correction method and system, device and storage medium
  • GNSS occultation ionospheric residual correction method and system, device and storage medium
  • GNSS occultation ionospheric residual correction method and system, device and storage medium

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Embodiment 1

[0051] Such as figure 1 As shown, Embodiment 1 of the present invention proposes a method for GNSS occultation ionospheric residual correction, which takes into account the effects of ionosphere and geomagnetic field. The method includes the following steps:

[0052] S11. Obtain GNSS occultation geometric data, ionospheric and geomagnetic data through data preprocessing;

[0053] This example uses GPS / MetOp-A occultation observation data, vTEC maps released by IGS stations and geomagnetic field data products released by GFZ for data processing. The basic input parameters of the bending angle ionospheric residual correction model are shown in Table 1. :

[0054] Table 1 Basic input parameters of the bending angle ionospheric residual correction model

[0055]

[0056] S12. Determine the input parameters of the ionosphere and the geomagnetic field according to the preprocessed GNSS occultation geometry, ionosphere and geomagnetic field data, combined with the ionosphere and geomagnetic...

Embodiment 2

[0084] Embodiment 2 of the present invention proposes a GNSS occultation ionospheric residual error correction system, which includes:

[0085] The preprocessing module preprocesses the original GNSS occultation data, vTEC maps data and geomagnetic field observation data to obtain GNSS occultation geometric data, ionospheric data and geomagnetic field data;

[0086] The electron density calculation module is used to calculate the electron density profile at the ionospheric puncture point on the "incoming ray" and "outgoing ray" side based on the GNSS occultation geometric data, three-dimensional NeuoG ionospheric model and ionospheric data;

[0087] Geomagnetic intensity calculation module, used to calculate the geomagnetic field intensity profile along the signal path at the position of the ionospheric puncture point on the "incoming ray" and "outgoing ray" based on GNSS occultation geometric data, IGRF geomagnetic field pattern and geomagnetic field data ;

[0088] The residual corr...

Embodiment 3

[0090] Embodiment 3 of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and the processor implements the implementation when the computer program is executed. The method of Example 1.

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Abstract

The invention provides a GNSS occultation ionospheric residual correction method and system, a device and a storage medium. The method comprises the steps of: preprocessing GNSS occultation original observation data, vTEC maps data and geomagnetic field observation data to obtain GNSS occultation geometric data, ionospheric data and geomagnetic field data; based on the GNSS occultation geometric data, a three-dimensional NeUoG ionospheric mode and the ionospheric data, calculating an electron density profile at the location of an ionospheric puncture point on an incident ray side and an emergent ray side; based on the GNSS occultation geometric data, an IGRF geomagnetic field mode and the geomagnetic field data, calculating a geomagnetic field intensity profile along a signal path at the location of the ionospheric puncture point on the incident ray side and the emergent ray side; based on the electron density and the geomagnetic field intensity along the signal path, calculating a bending angle ionospheric residual profile. The method of the invention can be used in the atmospheric parameter inversion of a single GNSS occultation event, weakens the influence of the ionospheric residual, obtains a high-precision GNSS occultation curved angular profile, and is 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 method, system equipment and storage medium for GNSS occultation ionospheric residual correction. Background technique [0002] GNSS occultation detection technology can obtain the vertical profile of physical parameters such as high vertical resolution, high precision, no calibration, long-term stability, all-weather atmospheric refractive index, density, temperature, humidity and pressure. GNSS occultation data has been used in climate analysis and medium-term numerical weather forecasting on a twenty-year scale. However, as the altitude increases, the influence of the ionosphere becomes greater, and the accuracy of inverting atmospheric parameters gradually decreases. The accuracy of occultation data at the top of the stratosphere and the bottom of the middle layer (25-60km altitude range) can no lon...

Claims

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Application Information

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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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