System and method for fsk signal demodulation and pulse recovery

Abstract

The invention discloses an FSK signal demodulation and pulse recovery system. The system comprises a local oscillator signal generation module (1), a frequency mixing module (2), a filter module (3) and a demodulation module (4) which are orderly connected with each other; the local oscillator signal generation module (1) is used for outputting a local oscillator signal having an output frequencyof f0+A or f0-A; the frequency mixing module (2) is used for attenuating a received pulse amplitude-modulated microwave signal Xr, then mixing the pulse amplitude-modulated microwave signal Xr with the local oscillator signal output by the local oscillator signal generation module (1), and outputting an intermediate frequency signal with a frequency range of A-df to A+df; the filter module (3) isused for filtering the intermediate signal, and amplifying the intermediate signal by a limiting amplifier to the maximum level and then outputting the intermediate signal; and the demodulation module(4) is used for demodulating the signal output by the filter module (3), outputting three voltage signals, comparing the voltage respectively with the standard voltage, after that, outputting three paths of signals DRC, DR1 and DR2, performing logical operation on the three paths of signals, and outputting four paths of independent pulse signals.

Description

technical field [0001] The invention belongs to the technical field of microwave signal demodulation, in particular to an FSK signal demodulation and pulse recovery system and method. Background technique [0002] In order to complete the function and performance test of the radio controller for missiles, etc., it is necessary to design a test unit that can replace the function of the irradiation guidance radar in the test equipment, and it is necessary to be able to receive and demodulate the pulse-modulated microwave signal sent by the radio controller. In the actual design, there will be a contradiction between increasing the demodulation bandwidth and compressing the demodulation bandwidth. Specifically, there are two points: (1) The pulse width of the pulse modulation of the downlink signal is relatively small (0.3μs), and its demodulation and reception needs to have a certain bandwidth in order to recover the complete pulse. (2) The increase of the demodulation bandwi...

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Problems solved by technology

(2) The increase of the demodulation bandwidth will introduce interference, and it is necessary to minimize the transition band at the edge of the filter frequency

[0003] In order to demodulate the baseband signal from the pulse-modulated microwave signal with wide bandwidth and large difference in signal strength, the detection circuit is required to have the characteristics of wide bandwidth, large dynamic range, and high linear fidelity, and the existing devices cannot meet this requirement

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