A Decoding Method of Secondary Response Data Chain Based on Frame Clipping

A technology of data link and data code, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve the problems of increased frame phantoms, inability to decode, and increased response data links, etc., to reduce the complexity of logical judgments , save the effect of complex logic calculations
CN109725307BActive Publication Date: 2020-08-04四川九洲空管科技有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
四川九洲空管科技有限责任公司
Publication Date
2020-08-04

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Abstract

The invention discloses a frame-rejected secondary response data chain decoding method. The method comprises the following steps of: 1) determining a first response data link frame in video data, andsetting it as a leading edge response data link; 2) detecting, extracting and cutting the leading edge response data chain from the video data; 3) decoding and outputting the leading edge response data chain; 4) replacing the original video data by the remaining video data, and repeating steps 1) to 3) until the decoding and outputting of all the response data link are completed. According to theframe-rejected secondary response data chain decoding method, the complicated logic calculation caused by simultaneous comparison of multiple response data is eliminated by using the pulse amplitude characteristic and the time distribution characteristic of the response data, the logic judgment complexity of the multiple interleaving response decoding is reduced by adopting the loop iterative decoding method, and the front edge response data is cut to eliminate the interference on subsequent response data judgment, and reduce the dependence of the decoding calculation on the response data frame.
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Description

technical field

[0001] The invention relates to a frame clipping secondary response data chain decoding method. Background technique

[0002] The secondary radar system is one of the key surveillance and communication means in the current air traffic control system. A typical secondary radar system consists of two parts, the ground station and the airborne response equipment. The secondary radar interrogator sends out interrogation pulses (using a frequency of 1030MHz) in all directions through the radar antenna. After the aircraft receives the interrogation pulses, it is installed on the The transponder on the aircraft responds to the response pulse (using a frequency of 1090MHz), and the interrogator receives and processes the response signal, and can obtain information such as the code, altitude, distance, and azimuth of the target. Among them, the composition rule of A / C mode reply data chain is: F1, F2 are frame pulses, which always exist in each reply, marking this se...

Claims

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