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Ionized layer anomaly monitoring method and device based on double-frequency double-constellation GBAS

An anomaly monitoring and dual-constellation technology, applied in the field of satellite navigation, can solve problems such as inconsistent ionospheric delay, GBAS navigation and positioning performance hazards, etc., to achieve enhanced capabilities and improved service integrity

Active Publication Date: 2022-02-15
TIANJIN 712 COMM & BROADCASTING CO LTD +1
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Problems solved by technology

[0003] Under normal conditions of ionospheric activity, through the differential signal processing of the ground station and the airborne terminal, GBAS can offset most of the impact of the ionosphere, and the absolute size of the ionospheric delay does not affect the accuracy and integrity of the airborne terminal positioning. When the distance between the airborne terminal and the GBAS ground station is relatively long, and the ionosphere is extremely active, the ionospheric delay between the ground station and the airborne terminal will be relatively inconsistent, resulting in a part of the ionospheric delay that cannot be eliminated through the differential processing of GBAS, thus Harm to GBAS navigation and positioning performance

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  • Ionized layer anomaly monitoring method and device based on double-frequency double-constellation GBAS
  • Ionized layer anomaly monitoring method and device based on double-frequency double-constellation GBAS
  • Ionized layer anomaly monitoring method and device based on double-frequency double-constellation GBAS

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[0045] The present invention will be further described in detail through the accompanying drawings and specific embodiments below.

[0046] Such as figure 1 As shown, under normal circumstances, when the distance between the GBAS airborne terminal and the ground station is less than 100km, there is a strong correlation between the ionosphere of the two, and the ionosphere error can be reduced to a safe enough value through the differential correction of GBAS. However, when there is an abnormality in the ionosphere and a large ionosphere gradient occurs, the correlation between the two will be destroyed. After GBAS differential processing, there will still be a large ionosphere error, which poses a threat to flight safety. Therefore, it is necessary to use this error monitoring and treatment.

[0047] Such as Figure 5 As shown, an ionospheric anomaly monitoring method based on dual-frequency dual-constellation GBAS provided by an embodiment of the present invention includes ...

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Abstract

The invention discloses an ionized layer anomaly monitoring method and device based on a double-frequency double-constellation GBAS. The method comprises steps of obtaining a differential correction value and a navigation satellite signal of a plurality of frequency points in the double-frequency double-constellation, employing the observation quantity and the correction value of the double-frequency double-constellation GBAS, and monitoring the ionosphere anomaly in real time under the condition of not adding extra hardware equipment, and affected satellites being eliminated. The method is advantaged in that a standby GBAS operation mode and the switching logic between the modes under the extreme abnormal condition of the ionized layer are realized, and service integrity of the GBAS system in the active region of the ionized layer can be improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an ionospheric anomaly monitoring method and device based on a dual-frequency dual-constellation GBAS. Background technique [0002] The Ground Based Augmentation System (GBAS) is a satellite navigation local augmentation system that can be used to provide positioning and navigation services during aircraft precision approach, landing and ground taxiing phases. It consists of ground base station system, airborne system and satellite navigation system. The ground base station system is used to capture GNSS satellite signals, and after differential processing, the correction signals are broadcast to the airborne system by using VHF data broadcasting equipment. The airborne equipment is a multi-mode receiver. By receiving satellite navigation signals and differential enhanced messages broadcast by ground equipment, it performs differential positioning calculation and i...

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Application Information

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IPC IPC(8): G01S19/07
CPCG01S19/072
Inventor 张建军吕自鹏吕琳杨阳庞雪莲赵磊韩明
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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