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Dynamic signal digital demodulation system and method based on beat frequency and software radio

A software radio and dynamic signal technology, which is applied in the field of information transmission, can solve the problem that low-frequency signals cannot be demodulated, and achieve high stability

Active Publication Date: 2021-11-02
JIANGNAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing signal demodulation system cannot demodulate low-frequency signals, the present invention provides a dynamic signal digital demodulation system based on beat frequency and software radio. The system includes: pump laser, wavelength division multiplexing devices, fiber laser cavities, photodetectors and general software defined radio peripherals;

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  • Dynamic signal digital demodulation system and method based on beat frequency and software radio
  • Dynamic signal digital demodulation system and method based on beat frequency and software radio
  • Dynamic signal digital demodulation system and method based on beat frequency and software radio

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Embodiment 1

[0040] This embodiment provides a dynamic signal digital demodulation system based on beat frequency and software radio, the system includes: pump source (Laser), wavelength division multiplexer (WDM), fiber laser cavity (Laser Cavity), photoelectric Detector (PD) and Universal Software Defined Radio Peripheral (USRP).

[0041]Among them, the pump source is connected to the fiber laser cavity through a wavelength division multiplexer, and at the same time, the wavelength division multiplexer is subsequently connected to a photodetector and a general software radio peripheral in turn.

[0042] When the system demodulates the dynamic signal, the pump source generates laser light, the laser light reaches the fiber laser cavity through the wavelength division multiplexer, and generates resonance in the fiber laser cavity; the dynamic signal acts on the fiber laser cavity, so that the light in it The signal is modulated to obtain the modulated optical signal, that is, the modulated...

Embodiment 2

[0044] This embodiment provides a dynamic signal digital demodulation system based on beat frequency and software radio, such as figure 1 As shown, the system includes: pump source (Laser) 1, wavelength division multiplexer (WDM) 2, fiber laser cavity (Laser Cavity) 3, photodetector (PD) 4, universal software radio peripheral (USRP )5 and computer (PC)6.

[0045] When the system demodulates the dynamic signal, the pump source 1 generates laser light, the laser light reaches the fiber laser cavity 3 through the wavelength division multiplexer 2, and generates resonance in the fiber laser cavity 3; at the same time, the exciter generates the dynamic signal , the dynamic signal acts on the fiber laser cavity 3, so that the optical signal therein is modulated to obtain the modulated optical signal, that is, the modulated signal, and the modulated optical signal is reflected through the wavelength division multiplexer 2 and then reaches the photodetector 4, A plurality of beat fre...

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Abstract

The invention discloses a dynamic signal digital demodulation system and method based on beat frequency and software radio, belonging to the technical field of information transmission. The system includes a pump laser, a wavelength division multiplexer, a fiber laser cavity, a photodetector and a general-purpose software radio peripheral; when demodulating a dynamic signal, the dynamic signal acts on the fiber laser cavity so that the optical signal therein After being modulated, the modulated optical signal is reflected by the wavelength division multiplexer and reaches the photodetector, and multiple beat frequency signals are generated on the photodetector, and the multiple beat frequency signals reach the general software radio peripherals. Set up to complete frequency conversion, superposition and demodulation, and obtain the demodulated dynamic signal. Since the system converts and superimposes the signal when demodulating the signal, the signal-to-noise ratio increases with the increase of the number of signal superpositions, so as long as the superposition number is sufficient, even if the low-frequency dynamic signal is submerged in the noise, the demodulation can be done.

Description

technical field [0001] The invention relates to a dynamic signal digital demodulation system and method based on beat frequency and software radio, and belongs to the technical field of information transmission. Background technique [0002] The detection of dynamic signals is widely used in civil engineering, industrial engineering, engineering machinery, aerospace and other fields. Especially the detection of weak low-frequency dynamic signals is of great significance in some important applications such as seismic waves and hydrophones. However, due to the harsh environment, the signal is extremely susceptible to interference, and the detection of weak low-frequency dynamic signals is still an important and challenging subject. [0003] Compared with electrical sensors, optical fiber vibration sensors have inherent advantages such as reliable operation in harsh environments, high precision, high sensitivity, and strong anti-interference ability. The dynamic signal demodu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/50H04B10/556H04B10/61
CPCH04B10/504H04B10/5563H04B10/616
Inventor 郭瑜毛晓炜余超沈言霞王浩威童星星
Owner JIANGNAN UNIV