An atc response processing method based on an integrated avionics platform

Abstract

The invention discloses an ATC response processing method based on a comprehensive avionics platform. An ask signal is obtained by intermediate-frequency signal input through respective frequency mixing and filtering, and an ask_pre signal is obtained through envelope detection; and the ask signal is used for standard pulse decoding including conventional decoding and pre-decoding. According to the method, the response signal can be output in advance through pre-decoding processing, then a power amplifier switch and a transceiver switching switch are turned on in advance in matching a timing requirement of a transmission path, and the response signal is turned off if it is detected, at a P4 judgment position, that a P4 pulse exists or a conventional-decoding flag is invalid. Compared withexisting ATC response processing methods, the ATC response processing method under the comprehensive avionics platform provided by the invention considers each processing process and asking signal input-response signal output of an antenna port, calculates total response delay time as 3.4 us, and meets a delay time requirement of conventional-mode response of a response machine of the comprehensive avionics platform under an S mode.

Description

technical field [0001] The invention relates to an ATC response processing method based on an integrated avionics platform. Background technique [0002] The ATC response function under the integrated avionics platform is composed of antenna interface unit, general transceiver module, general signal processing module, integrated display and control terminal and other parts. The ATC response processing program resides in the FPGA of the general signal processing module, and is responsible for completing The signal is transferred to the baseband signal, the inquiry signal is decoded, the response signal is encoded, and the general transceiver module and the antenna interface unit are controlled to send the response signal. [0003] The existing ATC response processing method is suitable for the secondary radar response equipment in the discrete avionics platform. Under the integrated avionics platform, the output of the general transceiver module to the signal processing FPGA ...

AI Technical Summary

Problems solved by technology

[0005] The difference between the ATC response equipment under the integrated avionics platform and the ATC response equipment under the discrete avionics platform is that the output of the general transceiver module to the signal processing FPGA is an intermediate frequency signal, and the FPGA needs to perform intermediate frequency signal processing (mixing, Filtering and threshold judgment), it takes 0.7us to output ASK pulse from intermediate frequency signal demodulation, so after applying the processing method on the existing discrete ATC answering equipment to the ATC answering equipment under the integrated avionics platform, calculate The total response delay is 4.1us, which cannot meet the requirements of the S-mode transponder for the response delay of the conventional mode (the index requirement of the response delay of the conventional mode is 3±0.5us)

Images