Multi-GNSS Monitoring System Testing And Abnormal Space Environment Detection

With the development of the Global Navigation Satellite System(GNSS),the detection of abnormal space environments has become a research hotspot.Scholars at home and abroad have done a lot of research on the detection of space environment,and the use of global navigation satellite system for abnormal space environment detection has great advantages.Space targets,solar activities and geomagnetic activities have a great influence on the ionosphere in the space environment,so studying the ionosphere in the space environment is the key to detecting abnormal space environments.In this paper,we first test the multi-GNSS monitoring system,formulate a test plan,and under the premise of ensuring the normal operation of the system,then use the rate of change of the ionospheric vertical total electron content(Vertical Total Electron Content,VTEC)and the ionospheric VTEC time series to detect anomalies Space environment.Finally,this paper detects the abnormal space environment through the ionospheric electron content change rate and the ionospheric VTEC time series.This article mainly conducts research from the following aspects:1.In the space environment,the ionosphere will be affected by many factors,among which the solar activity will have the most severe impact on the space environment,and the geomagnetic activity will also affect the ionosphere,and the ionosphere will also have different ionospheric anomalies and space targets.It will also have a certain impact on the space environment.2.By studying the ionospheric inversion in the space environment,the effects of errors in the process of ionospheric inversion are described,and the satellite hardware delay and receiver hardware delay obtained by the ionospheric inversion process are verified by experiments.The data of the GNSS service organization(International Globa1 Navigation Sate1 lite System Service,IGS)are different,and the difference changes very little.3.By summarizing the research work on system testing by domestic and foreign research scholars,formulate test plans for multi-GNSS monitoring systems,including multi-GNSS monitoring system performance test plans,integrity test plans and signal quality monitoring test plans.The process of space environment detection network and air environment detection based on multi-GNSS monitoring system is given,and the test process to ensure the normal operation of multi-GNSS monitoring system is established.4.Reflect the solar and geomagnetic activity through the solar activity and geomagnetic activity index,study the effect of solar flares on the space environment ionosphere on February 15,2011,and use the ionospheric VTEC time series to detect abnormal changes in the ionospheric VTEC and the ionosphere The VTEC two-dimensional distribution map shows the changes of the global ionosphere before and after the solar flare eruption.The specific time of the ionospheric change caused by the solar flare is detected by the ionospheric VTEC change rate.The geomagnetic activity index is used to reflect the geomagnetic activity,the impact of the magnetic storm on the space environment ionosphere on December 20,2015,and the ionospheric VTEC time series to detect abnormal changes in the ionospheric VTEC.Through the change of the ionosphere,the abnormal spatial environment changes caused by solar flares and magnetic storms can be detected.5.Study the factors that cause abnormal changes in the space environment,detect abnormal space environment by analyzing changes in the ionosphere,use the ionospheric VTEC time series to detect whether the space environment is abnormal,use the solar activity and geomagnetic activity index to reflect its calm activity,and use the ionosphere The VTEC change rate detection showed a small anomalous spatial environment change,which verified that there was a rocket launch on January 24,2006.The rocket launch time is consistent with the ionospheric VTEC change rate time,which verifies that the change in ionospheric VTEC can detect abnormal space environment.Therefore,the method of detecting abnormal space environment through the change of ionospheric VTEC is feasible.