S-mode response system in amplitude comparison direction-finding system, and signal processing method

Abstract

The invention discloses an S-mode response system in an amplitude comparison direction-finding system, and the S-mode response system comprises a digital orthogonal transformation unit, a digital orthogonal signal preprocessing unit, an A / C / S mode inquiry signal decoding unit, an S-mode response PPM / PCM coding unit, a DA chip data configuration unit, a data processing unit, a response signal azimuth angle control unit, and an omnidirectional / directional antenna control unit. The S-mode response system can refer to the design thought of a hardware circuit of a comprehensive monitoring system on a radio frequency receiving and transmitting channel, cooperates with a dedicated TCAS antenna to achieve a function of directional receiving and transmitting of a radio frequency signal, and greatly solves a problem of asynchronous crosstalk caused by ground secondary radar station inquiry. Moreover, the system increases the detection distance and reduces the power of a transmitter through employing receiving and transmitting gains of the directional antenna. The software logic algorithms of inquiry signal azimuth solving and response signal azimuth angle control are all integrated in an FPGA. The system is short in processing time, is good in timeliness, and is high in digitalization degree.

Description

technical field [0001] The invention relates to the fields of air traffic management and air traffic safety monitoring, in particular to an S-mode answering system and a signal processing method of an amplitude ratio direction finding system. Background technique [0002] The S mode transponder cooperates with the airborne TCAS equipment to form a TCAS system to achieve air-air coordination and collision avoidance. At the same time, it cooperates with the ground secondary radar to complete air traffic control. It is usually compatible with the original Air Traffic Control Radar Beacon System (ATCRBS) A / C mode transponder. function (usually referred to as ATC transponder), and also has the Discrete Addressable Beacon System (DABS, referred to as S mode) S mode transponder function. [0003] Traditional Mode S transponders receive 1030MHz inquiry signals omnidirectionally and transmit 1090MHz response signals omnidirectionally. Due to the difference in hardware environment an...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an S-mode answering system and a signal processing method of a ratio-amplitude direction-finding system, so as to solve the problem that the traditional S-mode transponder cannot judge the orientation of the inquiry signal, so that the inquiry equipment must maintain a high repeated inquiry frequency and a large In order to maintain the communication with the airborne transponder, there is a large amount of radio frequency signal interference in the flight airspace, which has a serious impact on the increasingly busy air traffic control, and the traditional S mode transponder acts as an independent individual , unable to share hardware resources and antenna channels with TCAS equipment, resulting in waste of hardware resources and inconvenient ground maintenance and management

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