GNSS-based ionospheric VTEC closed-loop test system

Abstract

The invention provides a GNSS-based ionospheric VTEC (Vertical Total Electron Content) closed-loop test system, which comprises a BDS / GPS satellite signal simulator used for generating a satellite downlink navigation signal, loading a tropospheric model and an ionospheric model and realizing real-time simulation of tropospheric delay and ionospheric delay of a satellite signal, a BDS / GPS dual-modeTEC test receiver used for receiving the satellite signal and generating an ionospheric delay correction model, and an ionospheric VTEC test upper computer software used for obtaining the original observed quantity of a tracking loop and the positioning calculation information of the receiver according to the ionospheric delay correction model, acquiring the hardware delay, ionospheric VTEC data,longitude and latitude deviation and height deviation of the receiver and the satellite and judging the quality of the ionospheric delay correction model according to the hardware delay, ionosphericVTEC data, latitude and longitude deviation and height deviation of the receiver and the satellite.

Description

technical field [0001] The invention belongs to the field of GPS satellite navigation processing, and in particular relates to a GNSS-based ionospheric VTEC closed-loop test system and method. Background technique [0002] Because the ionosphere contains a large number of ionized components, it has a significant impact on the propagation of radio signals, and will refract radio signals and cause energy loss of wireless signals. For short-wave signals, the ionosphere will reflect them, which is often used in ultra-long-distance radio communications. However, for signals sent by communication satellites, navigation satellites, etc., their frequencies are high, and they will directly penetrate the ionosphere and be affected by ionosphere irregularities, resulting in rapid jitter in the amplitude, phase, and time delay of the signal. , the ionospheric delay is also one of the largest sources of error in receiver positioning. [0003] The ionosphere is an extremely complex and ...

AI Technical Summary

Problems solved by technology

When strong scintillation occurs due to uneven electron density in the ionosphere, it may cause deep fading of the GNSS signal passing through it, and even cause the carrier tracking loop of the GNSS receiver to lose lock and channel loss.

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