GNSS computerized ionospheric tomography projection matrix acquisition method based on ellipsoid

A technology of projection matrix and acquisition method, which is applied in the direction of radio wave measurement system, satellite radio beacon positioning system, measurement device, etc.

Active Publication Date: 2016-09-21
SOUTHEAST UNIV
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Problems solved by technology

At present, ionospheric tomography using GNSS has made great progress, but due to the complexity of GN...

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  • GNSS computerized ionospheric tomography projection matrix acquisition method based on ellipsoid
  • GNSS computerized ionospheric tomography projection matrix acquisition method based on ellipsoid
  • GNSS computerized ionospheric tomography projection matrix acquisition method based on ellipsoid

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Embodiment Construction

[0062] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0063] The invention discloses a GNSS ionospheric tomography projection matrix acquisition method based on an ellipsoid, such as figure 1 shown, including the following steps:

[0064] S1: Determine the ionospheric tomography to-be-inverted area and the to-be-inverted time period;

[0065] Step S1 comprises the following steps:

[0066] S1.1: Determine the area to be inverted for ionospheric tomography;

[0067] Determine the longitude range [116.0° 123.0°] of the ionospheric tomography area to be inverted; the latitude range [30.0°36.0°]; the ellipsoid height range [70km 1000km];

[0068] S1.2: Determine the time period for ionospheric tomography to be inverted [05:01:15UT 05:01:45UT], and the time for ionospheric tomography to be inverted is [05:01:15UT 05:01:30UT 05:01 :45UT].

[0069] S2: discretize the area to be inverted into a series o...

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Abstract

The invention discloses a GNSS (Global Navigation Satellite System) computerized ionospheric tomography projection matrix acquisition method based on ellipsoid, and the method comprises the following steps: S1, a to-be-inversed area and a to-be-inversed period of the computerized ionospheric tomography are determined; S2, the to-be-inversed area is discretized as a series of 3D voxels; S3, geodetic space rectangular coordinates of a GNSS satellite and a GNSS receiver in the to-be-inversed area and the to-be-inversed period of the computerized ionospheric tomography are prepared; S4, intersection points of signal propagation paths from the GNSS satellite to the GNSS receiver in the to-be-inversed period and each surface of the 3D voxels are calculated; S5, the intercept lengths of the propagation paths of GNSS satellite signals in voxels are calculated; and S6, a projection matrix is formed. According to the invention, a problem that an earth ellipsoid is made to approximate to a ball based on a method for extracting projection matrix from the ball in the prior art is solved, and a condition that an actual intercept of the GNSS signal propagation path in inversed voxels can be faithfully reflected relative to the projection matrix of the earth ellipsoid can be ensured.

Description

technical field [0001] The invention relates to an ionospheric tomography projection matrix acquisition method, in particular to an ellipsoid-based GNSS ionospheric tomography projection matrix acquisition method. Background technique [0002] In the atmosphere at an altitude of about 60-1000km, due to the action of the sun's ultraviolet rays, high-energy particles and X-rays, a region with a large number of free electrons and positive ions is formed. This region is the ionosphere. When electromagnetic waves propagate in the ionosphere, reflection, refraction, scattering and absorption will occur, which will lead to bending of the signal path and change of propagation speed. In order to explain the occurrence of these phenomena, it is necessary to detect the structure of the ionosphere. The ionosphere detection is mainly to obtain the parameters that characterize the characteristics of the ionosphere (mainly study the electron density). [0003] With the development of Glob...

Claims

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Application Information

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IPC IPC(8): G01S19/07
CPCG01S19/07
Inventor 胡伍生余龙飞丁茂华
Owner SOUTHEAST UNIV
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