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Header detection method of 1090MHz extension message based on CA-CFAR

A CA-CFAR, 1090mhz technology, applied in the field of information processing, can solve problems such as high complexity and disadvantageous real-time processing, and achieve the effect of suppressing false header false detection and high detection probability

Active Publication Date: 2020-07-10
CIVIL AVIATION UNIV OF CHINA
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AI Technical Summary

Problems solved by technology

The method based on single-pulse and multi-pulse matched filter joint judgment effectively utilizes the autocorrelation characteristics of the header and eliminates the influence of the fluctuation of the sampling point position through multiple correlation processing, but the complexity of this method is high, which is not conducive to real-time processing

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  • Header detection method of 1090MHz extension message based on CA-CFAR
  • Header detection method of 1090MHz extension message based on CA-CFAR
  • Header detection method of 1090MHz extension message based on CA-CFAR

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Embodiment Construction

[0024] The CA-CFAR based header detection method of 1090MHz extended message provided by the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0025] Such as figure 1 As shown, the header detection method of the 1090MHz extended message based on CA-CFAR provided by the present invention includes the following steps carried out in order:

[0026] (1) Use the L-band receiver to demodulate the 1090MHz extended message (1090ES) radio frequency signal, and obtain the S1 stage of the sampled 1090ES video signal:

[0027] In this stage, the sampled 1090ES video signal needs to be obtained through the L-band receiver. First describe the signal model of the 1090ES of the ADS-B system. Generally, the 1090ES of the ADS-B system adopts Pulse Position Modulation (PulsePosition Modulation, PPM) encoding. Each 1090ES is composed of 8μs headers composed of 4 fixed preamble pulses and 112μs data blocks composed of 112 bi...

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Abstract

The invention relates to a header detection method of a 1090MHz extension message based on CA-CFAR. The method comprises the following steps: firstly, performing multi-pulse matched filtering on a header by utilizing the autocorrelation characteristic of a header waveform; and then estimating noise intensity by utilizing a sample mean value of a header close to a current detection unit in a low-level period, and jointly constructing an instantaneous CFAR threshold according to the determined false alarm probability, thereby providing a constant false alarm detection method of a 1090MHz extended message header. Simulation experiment results show that the method is not affected by the signal-to-noise ratio of received signals, and high detection probability can be obtained on the premise ofkeeping low false alarm probability. Meanwhile, due to the introduction of the instantaneous CFAR threshold, the CA-CFAR header detection method has a certain capability of inhibiting false header false detection in the 1090ES data block.

Description

technical field [0001] The invention belongs to the technical field of information processing, and in particular relates to a header detection method of 1090MHz extended message based on Cell Averaging-Constant False Alarm Rate (CA-CFAR). Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) technology has been recommended by the International Civil Aviation Organization (ICAO) as the core surveillance technology for the new generation of air transportation systems, and has become a secondary surveillance radar system for air traffic control. my country will also promote the ADS-B system to become the main means of air transport surveillance after 2020. The airborne equipment uses the ground-air data link to broadcast the real-time position and status information of the aircraft in the form of broadcast, and the ADS-B system ground station interprets the aircraft information based on the received message to form a corresponding track to monitor the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/24
CPCH04L1/0045H04L1/0047H04L1/0061H04L1/241H04L1/24
Inventor 苏志刚刘通郝敬堂韩冰
Owner CIVIL AVIATION UNIV OF CHINA