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Direction finding method for ACAS

A technology of azimuth angle and directional antenna, which is applied in the direction of orientator, measuring device, radio wave measurement system and other directions, which can solve the problems of phase ambiguity, low accuracy and poor stability of the direction finding compared with the phase

Active Publication Date: 2018-05-08
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

Using this method, the problems of low precision of amplitude direction finding, phase ambiguity and poor stability of phase comparison and direction finding are solved

Method used

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  • Direction finding method for ACAS
  • Direction finding method for ACAS
  • Direction finding method for ACAS

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Embodiment Construction

[0022] In order to better understand the present invention, the present invention will be further described in detail below through the accompanying drawings and examples.

[0023] The invention discloses a direction finding method applied to ACAS (Airborne Collision Avoidance System). The method fully combines the amplitude characteristics and phase characteristics of different azimuth signals with the four-unit directional antenna of ACAS, and first distinguishes the azimuth area by the amplitude characteristics. , using the advantage of the accuracy of phase direction finding to determine the precise orientation. By using this method, the problems of low precision of amplitude direction finding, phase ambiguity and poor stability of phase comparison and direction finding are solved.

[0024] Concrete realization project of the present invention is as follows:

[0025] like figure 2 As shown in the four-unit directional antenna layout diagram, four adjacent antennas cover...

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Abstract

The invention discloses a direction finding method for an ACAS. The direction finding method comprises the steps of firstly, performing detection and phase discrimination on four ways of intermediatefrequency signals in parallel, selecting two ways of strongest envelope signals from the detection results to determine a signal azimuth region, and obtaining four azimuth angle values from the phasediscrimination results; secondly, calculating an amplitude comparison angle value using the two ways of strongest envelope signals according to an amplitude comparison direction finding formula, and subjecting the four azimuth angle values to fusion to output a phase comparison angle value and a confidence level; thirdly, if the phase comparison angle value exceeds the signal azimuth region, thenadopting the amplitude comparison angle; and fourthly, when the amplitude comparison angle value differs greatly from the phase comparison angle value, if the confidence value of the phase comparisonangle value is higher, adopting the phase comparison angle value and otherwise, outputting the amplitude comparison value, and when the amplitude comparison angle value differs slightly from the phasecomparison angle value angle_F, adopting the phase comparison angle value. The direction finding method of the invention solves the problem that the precision of the amplitude comparison directionalfinding is not high and the phase comparison direction finding ambiguity and stability are poor.

Description

technical field [0001] The invention belongs to the field of aviation radio direction finding, in particular to a direction finding method of an ACAS system. Background technique [0002] ACAS (Airborne Collision Avoidance System) is an effective technical means to prevent aircraft collisions in the air, and is one of the core equipment to ensure flight safety. The ACAS system has high requirements for the accuracy and stability of direction finding. The airspace electromagnetic environment has become more and more complex with the development of the air transport industry. Coupled with the complex and harsh environment, the ACAS direction finding system has direction finding inaccuracies. Case. [0003] At present, the direction finding methods used in the ACAS system mainly include amplitude ratio and phase ratio direction finding. The amplitude ratio direction finding belongs to the omnidirectional amplitude single pulse direction finding technology. The amplitude ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/28
CPCG01S3/28
Inventor 支梁吴鑫炜徐丁海张锋烽
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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