A microwave or radio frequency power-free broadband carrier cancellation signal detection method

Abstract

Based on a microwave or radio frequency power-free broadband carrier cancellation signal detection method, a weak vibration sensor technology taking microwave or radio frequency as a carrier is combined with an interferometer technology, and a demodulation technology based on the carrier cancellation technology is used for realizing high-sensitivity detection of weak vibration; A microwave or radio frequency signal passes through a power divider to obtain two paths of output, the two output ends are connected with two arms of an interferometer respectively, and the two arms of the interferometer, namely a sensor arm and an amplitude-phase adjusting arm, are connected to a vibration sensor and an amplitude-phase adjuster respectively through circulators; A vibration sensing element of the sensor arm is biased by microwaves or radio frequency, and the vibration sensing element is subjected to phase modulation. The amplitude-phase adjusting arm ensures the realization of carrier cancellation; Sending to a receiving end through a circulator; A demodulation technology is applied, and micro-vibration information is restored after demodulation; According to the demodulation technology, ahomodyne mixing and orthogonal demodulation technology is adopted, so that a matte point is eliminated, and the noise is reduced.

Description

technical field [0001] The invention relates to a technique and a method for improving the phase modulation degree of a passive modulator with a concise structure, and effectively suppressing phase noise. It is of great significance in the fields of radar technology, microwave or radio frequency telemetry and remote sensing technology, high sensitivity and high precision vibration measurement technology, etc. Background technique [0002] Microwave / radio frequency vibration sensing and signal detection and phase modulation technology related to the present invention, interferometer technology is a method and device for microwave sensing sound signals proposed and authorized by the inventor, and the Chinese patent number is ZL201410618051.0. However, the accuracy and sensitivity of signal processing in the existing technology still need to be improved. In order to improve the detection performance of continuous wave microwave or radio frequency, even the performance of radar,...

AI Technical Summary

Problems solved by technology

However, the accuracy and sensitivity of signal processing in the existing technology still need to be improved. In order to improve the detection performance of continuous wave microwave or radio frequency, even the performance of radar, it is common to use high-frequency carrier cancellation and intermediate frequency carrier cancellation. Carrier cancellation It can not only prevent carrier leakage from causing adverse effects on the receiving system, but also improve the phase modulation degree of the low phase modulation degree modulation phase wave

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