A method for detecting an S-mode interrogation signal, a storage medium, and a detection device

Abstract

The invention discloses an S-mode interrogation signal detection method, a storage medium and a detection device. The detection method includes: S1, receiving an intermediate frequency signal and performing down-conversion to generate I and Q two-way signals; S2, respectively comparing I and Q signals The signal is filtered; S3, the filtered I, Q signals are respectively sent to the shift register buffer; S4, the adjacent symbols before and after the I, Q signals buffered in the shift register are subjected to correlation accumulation and summation processing; S5 , Synthesize the result of the correlation accumulation and summation processing of the I, Q signals into the phase inversion signal; S6, search for the P1, P2 pulses according to the phase inversion signal; S7, carry out bit synchronization by detecting the P6 pulse; S8, obtain through the correlation accumulation And the value processed by the result is judged, and the symbol information is output according to the judgment result. The invention generates a phase inversion signal through the correlation accumulation and summation of the preceding and following symbols, which not only realizes the detection of the S-mode ASK signal, but also realizes the search of the DPSK synchronization guide point and the decoding of the symbols.

Description

technical field [0001] The invention relates to the technical field of secondary radar and signal processing, in particular to a method for detecting an S-mode interrogation signal, a storage medium and a detection device. Background technique [0002] The number of aircraft supported by the secondary radar A / C mode is limited. When the number of aircraft increases to a certain level, it is easy to expose problems such as mutual interference and serious multipath effects. Accepted by ICAO as the industry standard for SSR. S mode adopts ASK and DPSK mixed modulation method, in which DPSK completes binary coding by inverting the phase by 180°. The commonly used DPSK demodulation methods include: quadrature demodulation, differential demodulation, DFT-based demodulation and cross-spectrum-based Analyzed DPSK demodulation, etc. Among them, differential decoding is relatively simple, but its performance is poor. Other algorithms involve complex tasks such as carrier recovery and...

AI Technical Summary

Problems solved by technology

S mode adopts ASK and DPSK mixed modulation method, in which DPSK completes binary coding by inverting the phase by 180°. The commonly used DPSK demodulation methods include: quadrature demodulation, differential demodulation, DFT-based demodulation and cross-spectrum-based Analyzed DPSK demodulation, etc. Among them, differential decoding is relatively simple, but its performance is poor. Other algorithms involve complex tasks such as carrier recovery and timing extraction, and have their own advantages in performance.

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