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direction finding method for acas

A technology of azimuth angle and directional antenna, which is applied to the direction measuring device, measuring device, radio wave measuring system and other directions, which can solve the problems of low precision of amplitude direction finding, phase ambiguity of phase comparison and direction finding, poor stability, etc.

Active Publication Date: 2021-07-16
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

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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] Such as figure 2 As shown in the four-unit directional antenna layout diagram, four adjacent antennas co...

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Abstract

The invention discloses a direction-finding method for ACAS, which includes: 1. performing wave detection and phase discrimination processing on four channels of intermediate frequency signals in parallel; Obtain four azimuth angle values ​​from the phase results; 2. Calculate the ratio angle value from the two strongest envelope signals according to the ratio amplitude direction finding formula, and output a phase ratio angle value and confidence degree through fusion of the four azimuth angle values ; Three, if the phase comparison angle value exceeds the signal azimuth area, then adopt the comparison amplitude angle value; Step 4, when the difference between the comparison amplitude angle value and the phase comparison angle value is large, if the confidence degree of the comparison phase angle value is high, Adopt the phase comparison angle value, otherwise output the comparison amplitude angle value; when the difference between the comparison amplitude angle value and the phase comparison angle value angle_F is small, then adopt the phase comparison angle value. The invention solves the problems of low precision of amplitude ratio and direction finding, phase ambiguity and poor stability of phase ratio and direction finding.

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 Patents(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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