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Ionospheric anomaly integrity monitoring method based on double-frequency GBAS

A technology of integrity monitoring and ionosphere, used in radio wave measurement systems, measurement devices, satellite radio beacon positioning systems, etc.

Pending Publication Date: 2020-06-23
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2003, the monitoring results of CORS in the United States showed that there was an ionospheric gradient as high as 412mm / km in the direction of the runway. At this time, if the geometric distribution of satellites is poor, unacceptable positioning errors will occur

Method used

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  • Ionospheric anomaly integrity monitoring method based on double-frequency GBAS
  • Ionospheric anomaly integrity monitoring method based on double-frequency GBAS
  • Ionospheric anomaly integrity monitoring method based on double-frequency GBAS

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Embodiment

[0101] The present invention is based on a dual-frequency GBAS ionospheric gradient anomaly integrity monitoring method, and the specific steps include:

[0102] Step 1, construction of dual-frequency detection statistics

[0103] In order to effectively monitor the ionospheric gradient along the direction of the runway, on the basis that the baseline is parallel to the direction of the runway and the coordinates of the receiver antenna are known accurately, when the ionospheric activity is normal under short baseline conditions, the delay caused by the double-difference ionosphere and troposphere can be ignored Atmospheric deviation, the dual-frequency detection statistic q is expressed as,

[0104]

[0105] Among them, e-1 2×1 Column vector;

[0106] — Cronet product operator;

[0107] E, D—are expectation and variance respectively;

[0108] A—design matrix of baseline vector b;

[0109] ΔI—Based on f 1 The double difference ionospheric delay;

[0110] Λ=diag{[λ ...

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Abstract

The invention belongs to the field of integrity monitoring and especially relates the ionospheric anomaly integrity monitoring method based on the double-frequency GBAS, ionospheric gradients are monitored in real time, satellites affected by ionospheric anomaly gradients are further eliminated, ionospheric gradient anomaly detection false alarm and missing detection synchronous control is achieved, and then the integrity of a GBAS service is improved. The method comprises the following steps: establishing a double-difference pseudorange and carrier phase double-frequency model between reference satellites according to double-frequency GBAS ionosphere gradient characteristics, and constructing double-frequency ionosphere gradient detection statistics; and under a framework of the double-frequency GBAS, solving wide lane ambiguity by using MW combination, and solving the ionospheric irrelevant integer ambiguity by using a MW-IF model. Under the GBAS framework, an ionospheric gradient ismonitored in real time through flexible combination of double-frequency observed quantities, the satellites influenced by the ionospheric anomaly gradient are eliminated, synchronous control of ionospheric gradient anomaly detection false alarm and missing detection is achieved, and the GBAS service integrity is improved.

Description

technical field [0001] The invention belongs to the field of integrity monitoring, and specifically relates to a method for realizing real-time monitoring of ionospheric gradients, further eliminating satellites affected by ionospheric abnormal gradients, realizing synchronous control of ionospheric gradient abnormal detection false alarms and missing detections, and further improving GBAS service Integrity-based dual-frequency GBAS ionospheric anomaly integrity monitoring method. Background technique [0002] GBAS is a new generation civil aviation navigation system used to replace the traditional instrument landing system (Instrument Landing System, ILS). The GBAS master control station broadcasts the global navigation satellite system (Global Navigation Satellite System, GNSS) pseudo-range differential correction and integrity information to aviation users within the scope of action, providing aircraft precision approach and landing services. With the development of GNSS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/20G01S19/08G01S19/07
CPCG01S19/20G01S19/08G01S19/07Y02A90/10
Inventor 李亮李强李家祥蒋家昌杨福鑫赵清波丁书航
Owner HARBIN ENG UNIV
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