Satellite navigation ionospheric service

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Deviation

Deviation

Signal deviation is a systematic error which must be controlled and compensated precisely for satellite navigation ionospheric and precise positioning applications. As one of IGS multi-mode GNSS deviation analysis centers, Chinese Academy of Sciences has provided IGS GNSS relative formal deviation DCB and absolute formal deviation OSB products since 2016, covering all open frequency points and signals of BDS2/3, GPS, GLONASS, Galileo and QZSS.

Absolute Pseudo-distance Deviation OSB

BDS GPS Galileo GLONASS QZSS

Relative Pseudo-distance Deviation DCB

BDS GPS Galileo GLONASS QZSS
Modeling

Modeling

By using Beidou /GNSS, ocean altimeter, DORIS and other high-precision data, combined with global spherical harmonic model, regional improved spherical harmonic model and local generalized trigonometric series model, a fast and accurate spatial ionospheric approach modeling method based on "pseudo-stability idea" was established. An accurate ionospheric simulation and efficient correction model of "global precision - regional refinement - local refinement" has been formed.

Prediction of the TEC

Forecast the Ion for 1 Day Forecast the Ion for 2 Day Forecast the Ion for 5 Day Fast Ionosphere

Real-time TEC

Global Real-time Global Combined China Region US Region European Region

New Content

new content
Disturbance

Disturbance

Ionospheric gradient, scintillation and other disturbance effects are one of the most difficult problems restricting the accurate and reliable service of Beidou /GNSS. A perturbation fine detection method based on ROTI, GIX, AATR, amplitude and phase scintillation index was constructed to make full use of the regional/global intensive real-time GNSS observation resources. Real-time monitoring, accurate modeling and short-term prediction of ionospheric gradient and scintillation effect were realized.

Global

ROTI Products Amplitude Scintillation Phase Scintillation

China

ROTI Products GIX Products Amplitude Scintillation Phase Scintillation
Applications

Applications

Fine monitoring and error control of space ionospheric delay, gradient and scintillation effects are very important for navigation and communication applications. Based on ground-based GNSS/DORIS, ocean altimetry and low-orbit occultation ionospheric observation data, ARTEMIS real-time ionospheric correction data service performance and its influence on precise positioning were analyzed.

Analysis of Product Accuracy

IGS-GIM GNSS-dSTEC DORIS-dSTEC Jason-TEC

Precision Analysis of SF PPP

Positioning Accuracy Gain Convergence Time Comparison
About

热力图

Satellite Navigation Ionospheric Service

The Earth's ionosphere is one of the most important error sources affecting the precision application of global navigation Satellite System (GNSS). As the IGS ionospheric Analysis Center (code CAS), the Chinese Academy of Sciences has fully exploited the advantages of multi-source heterogeneous GNSS observation, explored the spatio-temporal characteristics of space atmospheric effects, and formed the multi-level ionospheric modeling method and lightweight correction service for satellite navigation of "global precision - regional precision - local precision". It meets the requirements of fine monitoring and efficient correction of space ionospheric errors for accurate and reliable positioning of satellite navigation GNSS.

Reserch Progress

2022-08

Update of CAS Pseudo-distance Deviation Products

In order to further meet the needs of satellite navigation precision positioning for deviation data products, CAS has been offering multi-mode GNSS DCB and OSB products with APC correction in mind since August 2022. The files of both products are currently available for download from our FTP. ftp://ftp.gipp.org.cn/product/dcb/mgex/, after waiting for IGS documents details finalized, will be synchronized to IGN and CDDIS. All experts are welcome to download and use, and feedback to us the problems in use.

Details

2022.09

Release of Real-time Ionospheric Synthesis Products

Dear experts and friends, in order to promote the application of ionospheric real-time products, the teams of CAS and CAS have recently started to provide real-time ionospheric comprehensive products. The source products are from UPC, CAS, WHU and CNES. Welcome to use the test, please feel free to contact us if you have any questions. Specific information received is as follows:
IP: products.igs-ip.net
Port: 2101
Mountpoints: IONO01IGS0 (RTCM-SSR) & IONO01IGS1 (IGS-SSR)
Li Zi-Shin lizishen@aircas.ac.cn; Wang Ningbo wangnb@aircas.ac.cn

The International GNSS Ionospheric Symposium 2022 (IWGI2022) was held in Neustrelitz, Germany

2022-09-26 Details

The Commison4 conference of the International Geodesy Association is being held in Potsdam, Germany

2022-09-05 Details

IGS Workshop, an international GNSS service organization with the theme of "Science from Earth to Space", was held

2022-08-27 Details

The 2022 COSPAR Beacon Satellite Annual Conference was held in Boston, USA

2022-08-01 Details

The International Geodesy Association 2021 Scientific Congress was held

2021-07-20 Details

Progress has been made in ionospheric fine monitoring and application services based on Beidou /GNSS

2019-07-05 Details