Real-time complex signal identification and parameter estimation method based on FPGA

Abstract

The invention discloses a real-time complex signal identification and parameter estimation method based on an FPGA (Field Programmable Gate Array), which is used for detecting a pulse signal by utilizing a digital channelization technology. When a pulse is detected, signal intermediate frequency data is subjected to tracking filtering processing and then is input into the in-pulse analysis FPGA module for pipeline processing. Firstly, an intra-pulse analysis module calculates signal amplitude of intermediate frequency data input by running water, solves signal phase and phase ambiguity, and performs sliding window accumulation on the amplitude of the signal to obtain rising time and falling time of the signal; and performing multiple differential operation on the signal phase to obtain a real-time instantaneous frequency. And the change conditions of the instantaneous frequencies at different moments are counted to obtain the carrier frequency, bandwidth, modulation rate, code element change and other characteristics of the signal, and after the pulse ends, the modulation type of the pulse is identified according to various statistical values of the counted characteristics, and the characteristic parameters are output. The pulse modulation type and the characteristic parameters are output in real time and supplemented to conventional PDW description information, FSK signal coding is carried out, and complete PDW information is output.

Description

technical field [0001] The invention belongs to the field of electronic reconnaissance, and in particular relates to an FPGA-based real-time complex signal identification and parameter estimation method. Background technique [0002] The modern electromagnetic signal environment is unprecedentedly complex, and the signal environment faced by electronic reconnaissance can be qualitatively summarized as follows: 1) The number of radiation sources is increasing day by day. 2) There are many radiation source systems, and the waveform of the radar signal is complex and changeable. 3) The range in which the operating frequencies of the radiation sources overlap each other becomes wider and wider. 4) There are more and more signals in the same frequency range, and more and more signals appear at the same time. 5) Guidance and fire control radars radiate more and more signals, making it necessary for the radar system to intercept and identify such serious and urgent threat signals...

AI Technical Summary

Problems solved by technology

Solve the problem of slow modulation recognition and parameter estimation in modern complex electrom...

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