Optical carrier microwave signal dynamic wideband real-time digital demodulation system

Abstract

The invention discloses an optical carrier microwave signal dynamic wideband real-time digital demodulation system. The system comprises a photoelectric conversion module, a receiving channel module, an analog-to-digital conversion module, a real-time demodulation signal processing module and a whole-machine reference and sequence generation control module. The photoelectric conversion module receives optical carrier microwave signals of one fiber laser double-frequency beat wave sensor, converts the signals into electric signals, completes a beat wave process of the fiber laser double-frequency beat wave sensor and outputs radio frequency modulation signals comprising sensing information, the receiving channel module performs frequency conversion filtering amplification processing on the radio frequency modulation signals comprising the sensing information so as to obtain intermediate-frequency signals, the intermediate-frequency signals are then converted into intermediate-frequency digital signals through the analog-to-digital conversion module, then, the real-time demodulation signal processing module processes the intermediate-frequency digital signals in real time, demodulates sensing signals and sends detected physical quantity signals of a demodulation result to a next-stage control processing unit, and the whole-machine reference and sequence generation control module sends reference clock and time sequence generation control signals to the receiving channel module, the analog-to-digital conversion module and the real-time demodulation signal processing module.

Description

technical field [0001] The present invention relates to a real-time digital demodulation system, in particular to a dynamic wide-band real-time digital demodulation system for optical-carrying microwave signals, specifically to a dynamic wide-band real-time digital demodulation system for optical-carrying microwave signals of a fiber laser dual-frequency beat wave sensor , this type of sensing technology is widely used in the detection of weak dynamic signals such as vibration acceleration and underwater sound pressure in extreme environments. Background technique [0002] Optical fiber sensing is widely used in many special conditions due to its advantages of high sensitivity, high degree of refinement, large dynamic range, no front end, intrinsic safety, flexibility and light weight, integration of sensing and transmission, and easy networking and multiplexing. The optical fiber sensing mechanism is to convert the measured physical quantity into the corresponding change of...

AI Technical Summary

Problems solved by technology

However, if the fiber laser dual-frequency beat wave sensor perceives dynamic signals, such as single-frequency, multi-frequency, or even broadband, random and other complex physical quantities, the traditional spectrum analysis technology will not be able to separate the signal from the FM signal. restore

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