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Method for building global ionospheric grid VTEC model by GNSS, HY-2 and COSMIC data fusion

A data fusion and ionospheric technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of regional differences in the accuracy and reliability of the global ionospheric grid model

Inactive Publication Date: 2016-12-07
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of regional differences in the accuracy and reliability of the global ionospheric grid model caused by the uneven distribution of GNSS observation stations around the world, and integrate GNSS, HY-2 and COSMIC data to establish accuracy and reliability distribution A more uniform global ionospheric grid VTEC model

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  • Method for building global ionospheric grid VTEC model by GNSS, HY-2 and COSMIC data fusion
  • Method for building global ionospheric grid VTEC model by GNSS, HY-2 and COSMIC data fusion
  • Method for building global ionospheric grid VTEC model by GNSS, HY-2 and COSMIC data fusion

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[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] The present invention determines that the time for establishing the global ionospheric grid VTEC model is April 11, 2015 (the 101st day in 2015).

[0048] figure 1 Flow chart of building a global ionospheric grid VTEC model for GNSS, HY-2 and COSMIC data fusion.

[0049] The number of GNSS observation stations participating in the establishment of the model is determined to be 256, and the data sampling interval of the observation stations is 30 seconds. The distribution of GNSS observation stations is as follows: figure 2 as shown, figure 2 The middle triangle symbol indicates the location distribution of GNSS observation stations.

[0050] Collect GNSS observation station data (including: observation files and ephemeris files), HY-2 satellite altimeter Ku-band ionospheric correction data and COSMIC electron density data. HY-2 satellite observation footprin...

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Abstract

The invention discloses a method for building a global ionospheric grid VTEC model by GNSS, HY-2 and COSMIC data fusion. The method comprises the following steps of determining time for building the global ionospheric grid VTEC model; determining a GNSS observation station participating in building the global ionospheric grid VTEC model; collecting data: collecting data of the GNSS observation station, ku-waveband ionospheric correction data of an HY-2 satellite altimeter and COSMIC electron density data; determining rights of VTEC G, VTEC H and VTEC C; after iteration is finished, taking an adjustment result X obtained by last iteration as a spherical harmonic function model coefficient of fusion; setting an interval of 5 degrees in a longitude direction [-180 degrees to +180 degrees]; setting an interval of 2.5 degrees in a latitude direction [-87.5 degrees to +87.5 degrees]; and substituting the intervals into a spherical harmonic function model to obtain a global ionospheric grid VTEC value of fusion.

Description

technical field [0001] The invention relates to the field of ionospheric application research, and relates to a method for establishing a global ionospheric grid VTEC model through fusion of GNSS, HY-2 and COSMIC data. Background technique [0002] The ionosphere is an important part of the space environment of the sun and the earth, and is closely related to human production and life. GNSS has the advantages of passive detection, global coverage, low cost, large amount of data, and good continuity in time and space. It is an important technical means for large-scale continuous high-precision ionospheric VTEC monitoring. In 1998, the International IGS Organization specially established the Ionosphere Working Group, whose main task is to use the observation data of globally distributed GNSS observation stations to establish a global ionosphere model, and release it to global users free of charge in the IONEX data format. However, the distribution of GNSS observation stations...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 王新志柯福阳孙慧莉
Owner NANJING UNIV OF INFORMATION SCI & TECH
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