Signal processing method of mode s transponder based on amplitude comparison and direction finding system

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 field of air traffic management and air traffic safety monitoring, in particular to a signal processing method of an S-mode transponder based on a ratio-amplitude direction finding system. Background technique [0002] Mode S transponder cooperates with airborne TCAS equipment to form a TCAS system to achieve air-to-air coordinated collision avoidance. At the same time, it cooperates with 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), but also with discrete addressing beacon system (DABS, referred to as S mode) S mode transponder function. [0003] The traditional Mode S transponder receives 1030MHz interrogation signals in all directions and transmits 1090MHz response signals in all directions. Due to the difference in hardware environment and channel design,...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a signal processing method of an S-mode transponder based on the ratio-amplitude direction-finding system, which solves the problem that the traditional S-mode transponder cannot judge the orientation of the inquiry signal, so that the inquiring device must maintain a higher frequency of repeated inquiries and a relatively high frequency of inquiry. Large transmit power to maintain communication with the airborne transponder, resulting in a large number 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 as an independent Individuals cannot 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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