Post-event analysis method and device for ionosphere model

Abstract

The invention provides a post-analysis method and device for an ionosphere model. The device comprises a global range total electron content analysis module, an ionosphere delay calculation module and an ionosphere model judgment module. The ionosphere delay calculation module calculates a BDS-3 ionosphere delay correction value based on a BDGIM model through ionosphere parameters, and further obtains a vertical total electron content value under the position and time of the receiver; and the ionosphere delay calculation module further comprises the steps of improving a traditional Klobuchar model, performing least square estimation on parameters in the model in combination with carrier phase observed quantity, and calculating a BDS-2 ionosphere delay correction value. The ionosphere delay data analysis efficiency is improved, the correction effects of the BDS-2 ionosphere model and the BDS-3 ionosphere model can be compared and checked, whether the positioning precision of the area where the receiver is located is affected by the active ionosphere or not can be judged through an established model correction effect detection mechanism, and a reliable basis is provided for positioning analysis of the receiver.

Description

technical field [0001] The invention relates to a post-event analysis method and device for an ionospheric model, and belongs to the field of satellite navigation positioning calculation. Background technique [0002] The error sources in the satellite signal propagation process can be divided into satellite-related errors, signal propagation-related errors and receiver-related errors. Among them, the ionospheric error is the signal delay caused by passing through the ionosphere during the propagation of electromagnetic waves, and its equivalent distance can reach up to 20m, which is one of the most important sources of error affecting the positioning accuracy of the receiver. [0003] The Beidou-2 satellite navigation system focuses on providing satellite navigation services in the Asia-Pacific region. The traditional Klobuchar ionospheric model adopted by it can correct up to 70% of the Chinese region in the northern hemisphere, but the correction accuracy in high latitude...

AI Technical Summary

Problems solved by technology

[0004] The existing Beidou-2 Klobuchar ionospheric model has poor accuracy in high latitudes, and the estimation of the peak time of the ionosphere has a certain deviation, and the calculation method of the ionospheric delay at night is too simple, which is significantly different from the actual delay value. Further adjustments and improvements

However, the existing ionospheric delay detection often uses the ionospheric delay values ​​calculated by multiple receivers for comparison, lacks comparison benchmarks and judgment standards, and does not conduct specific analysis at the level of electronic content

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