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Articles in press have been peer-reviewed and accepted, which are not yet assigned to volumes/issues, but are citable by Digital Object Identifier (DOI).

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Analysis of the impact and effects of the solar storm on the ionosphere from May 8 to 16, 2024

WANG Shuai, QUAN Lin, LI Ling, WANG Kunpeng, HUANG Jian, YUAN Gang

, Available online , doi: 10.12265/j.gnss.2024107

[Abstract](92) [FullText HTML] (37) [PDF 5661KB](6)

Abstract:
Solar storms can cause severe disturbances to the state of Earth’s ionosphere and affect navigation and positioning performance. According to the ionospheric disturbance event occurring during the solar storm from May 8 to 16, 2024, the changes of ionospheric total electron content, ionospheric total electron content change rate, ionospheric F₂ layer critical frequency, satellite navigation single point positioning error and so on at different latitude stations in the eastern and western hemispheres are analyzed. The analysis result shows that the sun-lit hermisphere of the ionosphere will respond to X-ray flares, but the main source of the disturbance is the geomagnetic storm caused by the solar wind southward magnetic field energy injection. The responses at the top and bottom of the ionosphere during solar storms are not synchronized; The single point positioning error of satellite navigation will increase significantly during the solar storm, especially in the vertical direction it will increase to about ±10 m. It will continue to exist during the recovery phase of ionospheric storms, and gradually weaken with the calm of the ionospheric state.

Application research of RINGO software in multi-system GNSS data preprocessing

FAN Jiuguo, LI Jianyong

, Available online , doi: 10.12265/j.gnss.2023202

[Abstract](322) [FullText HTML] (126) [PDF 4282KB](47)

Abstract:
Data preprocessing is a prerequisite for achieving high-precision positioning with the Global Navigation Satellite System (GNSS) and is also a vital step in data processing. As the number of satellite systems, numbers, and versions of Receiver Independent EXchange format (RINEX) increase, the GNSS data types and formats become progressively complex. Thought there are various data preprocessing software options available, multiple programs are required to complete the preprocessing stage, resulting in inefficiency and complexity. Therefore, to achieve efficient data preprocessing, developers have created the “RINGO” data preprocessing software, which supports all RINEX versions of multi-system data preprocessing. To achieve effective data preprocessing, developers created the “RINGO” software which supports all RINEX versions of multi-system data preprocessing. The study demonstrates the main functions, usage and principles of RINGO, with a focus on investigating and explaining confusing functions such as receiver clock jump correction. The test results demonstrate that RINGO can effectively and independently preprocess vast amounts of multi-system GNSS data, which can significantly ease the complex task of GNSS data management and foster the adoption of the latest version of RINEX observation records.

Architecture design of radiation source positioning system based on TDOA

HU Anyi, WANG Dengliang, QIN Bingkun, ZHANG Faxiang

, Available online , doi: 10.12265/j.gnss.2023174

[Abstract](144) [FullText HTML] (114) [PDF 2726KB](16)

Abstract:
To ensure the normal application of the Global Navigation Satellite System (GNSS), monitoring and localization of GNSS interference radiation sources are required. This paper presents the design of a radiation source positioning system architecture. By designing the system functions, architecture, grid monitoring equipment and workflows, high-precision time synchronization and reliable time difference measurements are achieved using BeiDou/GPS timing + high-stability crystal oscillators and a generalized weighted time delay estimation algorithm, which ensures the accuracy of time difference of arrival (TDOA) localization. The effective location of radiation source is realized through system application test.