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Unambiguous microwave photon Doppler frequency shift measurement method based on cascade modulator

A Doppler frequency shift, microwave photon technology, applied in the field of microwave photon Doppler frequency shift measurement, can solve problems such as limiting measurement accuracy

Active Publication Date: 2021-04-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the additional error introduced by the frequency shift modulator used in the system, the measurement accuracy of the system is limited

Method used

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  • Unambiguous microwave photon Doppler frequency shift measurement method based on cascade modulator
  • Unambiguous microwave photon Doppler frequency shift measurement method based on cascade modulator
  • Unambiguous microwave photon Doppler frequency shift measurement method based on cascade modulator

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Embodiment Construction

[0042] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0043] Such as figure 2 As shown, in this embodiment, the device includes: laser LD, signal source Reference, phase shifter PS, dual polarization Mach-Zehnder modulator Dpol-MZM, polarization controller PC, polarizer Pol, optical amplifier EDFA, dense Type wavelength division multiplexer DWDM, phase modulator PM, photodetector PD. The optical carrier output by the laser LD is directly injected into the input port of the Dpol-MZM and is divided into two channels by power, one low-frequency reference signal is directly added to the port1 port of the upper sub-modulato...

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Abstract

The invention discloses an unambiguous microwave photon Doppler frequency shift measurement method based on a cascade modulator, and belongs to the technical field of microwave photons. The method is as shown in figure 1 in the specifications. According to the method, a laser LD, a dual-polarization Mach-Zehnder modulator Dpol-MZM, a phase modulator PM, a polarizer Pol, an erbium-doped fiber amplifier EDFA, an intensive wavelength division multiplexer DWDM and a photoelectric detector PD are adopted. According to the method, a low-frequency reference signal and an echo signal are respectively modulated on an upper sub-modulator MZMx and an lower sub-modulator MZMy of the Dpol-MZMl the MZMx works at an orthogonal point to perform single sideband modulation SSB; the MZMy works at a minimum point to perform double sideband modulation CS-DSB for suppressing carrier waves; an X axis of the output signals of the Dpol-MZM is aligned with a main axis of the PM, transmitted signals are subjected to phase modulation; the output of the PM passes through the polarizer Pol, the EDFA AND the DWDM, so that expected positive first-order sideband signals can be obtained; the expected positive first-order sideband signals are sent to the PD for beat frequency; a result is detected by a low-frequency electrical spectrometer ESA; and therefore, a Doppler frequency shift value and direction can be measured at the same time with the influence of signal phases avoided.

Description

technical field [0001] The invention relates to the technical field of optical communication and microwave technology, and mainly relates to the realization of unambiguous microwave photon Doppler frequency shift measurement based on cascaded modulation of a dual-polarization Mach-Zehnder modulator and a phase modulator. Background technique [0002] Microwave photon Doppler frequency shift measurement refers to the Doppler frequency shift of the modulated echo signal received by the antenna and the modulated transmitted signal beat frequency, which is widely used in communication, scientific measurement, electronic warfare and radar systems middle. Therefore, it is of great significance to accurately measure the Doppler frequency shift. Due to the limitation of the measurement device, the traditional electric domain measurement method can only work in a specific frequency band to measure a small range, and has poor anti-electromagnetic interference ability and low measurem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02H04B10/25
CPCG01R23/02
Inventor 张卓文爱军卓昊
Owner XIDIAN UNIV