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GBAS Ionospheric Anomaly Detection Method Based on LMS Adaptive Filter

A technology of adaptive filtering and adaptive filtering, applied in radio wave measurement systems, measurement devices, satellite radio beacon positioning systems, etc., can solve problems such as affecting the life safety of users and difficult to meet the needs of navigation accuracy and integrity, etc. To achieve the effect of improving accuracy and sensitivity, and improving detection sensitivity

Active Publication Date: 2021-08-06
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

Although the impact of ionospheric delay on GNSS accuracy can be weakened by mathematical modeling or the combination of dual-frequency GNSS satellite signals, in specific areas of use, serious position errors caused by ionospheric delay will affect the safety of users. Therefore, the state of the ionosphere must be monitored in real time. For example, GBAS used to support aircraft precision approach and landing is difficult to meet its navigation accuracy and integrity requirements after being affected by the ionospheric gradient

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  • GBAS Ionospheric Anomaly Detection Method Based on LMS Adaptive Filter
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  • GBAS Ionospheric Anomaly Detection Method Based on LMS Adaptive Filter

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Embodiment

[0089]Next, take the experimental GBAS reference station established by a research institute of CETC as the experimental object to verify the correctness of the GBAS ionospheric anomaly detection method proposed by the present invention. The experimental GBAS ground system includes 4 reference stations, a data processing center, a multi-carrier navigation signal simulator, a VDB (Very High Frequency, VHF Data Broadcasting) station and a satellite antenna.

[0090] The verification experiment was carried out using real satellite signals, and multiple sets of experimental data were collected. One set of data was selected for detailed analysis. The experimental time was March 21, 2018. Due to the low frequency of ionospheric anomalies, this paper simulates a period of ionospheric anomalies on the pseudo-range and carrier phase observations of the No. 14 satellite. layer anomaly, the duration is 1000s.

[0091] Figure 4a Pseudo-code-to-carrier deviation is filtered using a seco...

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Abstract

The invention discloses a GBAS ionospheric anomaly detection method based on LMS adaptive filtering. The invention constructs a single-channel variable-step-size LMS adaptive filter to suppress pseudocode-carrier deviation degree high-frequency noise, and a single-channel LMS adaptive filter Based on the standard dual-channel LMS adaptive filter, the short-term correlation of the detected signal and the non-correlation of the quantization noise are used to construct an adaptive filter that uses the delay of the detected signal as a reference input. The Sigmoid function is improved so that the adaptive filter converges quickly in the early stage and maintains high stability after the filter converges. The filtering method proposed by the invention has better high-frequency noise suppression effect, and has the best detection performance for ionospheric slow growth faults.

Description

technical field [0001] The invention belongs to the field of satellite-based navigation enhancement systems, and in particular relates to a GBAS ionospheric anomaly detection method based on LMS self-adaptive filtering. Background technique [0002] At present, the instrument landing system (Instrument Landing System, ILS) is widely used in civil aviation navigation to provide precise approach and landing guidance services for aircraft. Its channel is only 40, which seriously restricts the increase of approach flight volume, and gradually becomes the limit for flight volume growth. the bottleneck. In recent years, the Global Navigation Satellite System (GNSS) has been gradually improved. GNSS has been used more and more by virtue of its global, all-weather, and high-precision advantages. The International Civil Aviation Organization (ICAO) has planned to use GNSS Replacing ILS, reducing the cost of aviation navigation, increasing the flexibility of route design and approach...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/07
CPCG01S19/07
Inventor 胡杰严勇杰谢晓妤石潇竹李贺单尧
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP