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

A broadband carrier and signal detection technology, which is applied in phase-modulated carrier systems, electrical components, transmission systems, etc., can solve the problems that signal processing needs to be improved, and achieve the effects of simple structure, large carrier compression ratio, and suppression of phase noise

Active Publication Date: 2019-06-21
CHANGZHOU HIGH TECH RES INST OF NANJING UNIV
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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

Method used

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

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Embodiment Construction

[0028] As shown in the figure, a wired connection can be used. Microwave / radio frequency, especially the continuous wave signal (1) is incident on the directional coupler (2), and the local oscillator signal is coupled out by the 10dB directional coupler and enters the local oscillator port of the image rejection mixer (9). The main signal is incident on the power splitter (3), and enters the two arms of the March-Zender interferometer respectively. One arm enters the amplitude and phase regulator through the circulator (4). Enter the power combiner (7), and the other arm enters the vibration sensor through the circulator (4') and enters the power combiner (7) after phase modulation, which contains the carrier signal and the sideband signal containing vibration information. Among them, if the degree of modulation is c, the carrier signal in the sensor arm is proportional to the zero-order Bessel function J 0 (c), the sideband signal is proportional to J 1 (c). The phase-mo...

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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,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/525H04L27/20
Inventor 钱鉴府锡东
Owner CHANGZHOU HIGH TECH RES INST OF NANJING UNIV
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