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Unambiguous Microwave Photon Doppler Shift Measurement Method Based on Cascaded Modulators

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

Active Publication Date: 2022-04-19
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Shift Measurement Method Based on Cascaded Modulators
  • Unambiguous Microwave Photon Doppler Shift Measurement Method Based on Cascaded Modulators
  • Unambiguous Microwave Photon Doppler Shift Measurement Method Based on Cascaded Modulators

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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] like 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, optical Bandpass filter OBPF, 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-modulator MZMx, and the RF por...

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Abstract

The invention discloses an unambiguous microwave photon Doppler frequency shift measurement method based on a cascaded modulator, which relates to the technical field of microwave photons. The method is as shown in Figure 1 of the description, comprising 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 optical bandpass filter OBPF, Photodetector PD. The invention modulates the low-frequency reference signal and the echo signal on the upper and lower sub-modulators MZMx and MZMy of Dpol-MZM respectively, MZMx works at the orthogonal point to perform single sideband modulation SSB, and MZMy works at the minimum point to suppress the double sideband of the carrier Modulate CS-DSB, Dpol-MZM output signal X-axis aligned with the main axis of PM to phase modulate the transmitted signal, PM output through the polarizer Pol, EDFA, OBPF to get the desired positive first-order sideband signal, sent to PD The beating frequency is performed, and the result is detected by the low-frequency electrospectrometer ESA, which can simultaneously measure the value and direction of the Doppler frequency shift without being affected by the signal phase.

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 Patents(China)
IPC IPC(8): G01R23/02H04B10/25
CPCG01R23/02
Inventor 张卓文爱军卓昊
Owner XIDIAN UNIV