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Microwave photon doppler frequency shift measuring system and regulating method thereof

A Doppler frequency shift and measurement system technology, applied in the field of microwave photon measurement, can solve the problem of deteriorating signal quality

Active Publication Date: 2019-07-19
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

Due to the nonlinearity of the electro-optical modulator and photodetector, the radio frequency signal will generate second-order intermodulation distortion after passing through the optical radio frequency link, thereby deteriorating the signal quality

Method used

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  • Microwave photon doppler frequency shift measuring system and regulating method thereof
  • Microwave photon doppler frequency shift measuring system and regulating method thereof
  • Microwave photon doppler frequency shift measuring system and regulating method thereof

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] The microwave photon Doppler frequency shift measurement system includes a laser source, a PDM-MZM, an erbium-doped fiber amplifier (Erbium-doped Fiber Amplifier, EDFA), an optical band-pass filter (Optical Band Pass Filter, OBPF), an optical branch A polarization controller (Polarization Controller, PC), a polarization beam splitter (Polarization Beam Splitter, PBS) and a balanced photodetector (Balanced Photodetector, BPD), the optical output end of the laser source is connected to the optical signal input end of the PDM-MZM, The output end of the PDM-MZM is connected to the input end of the EDFA, the output end of the EDFA is connected to the input end of the OBPF, the output end of the OBPF is connected to the input end of the optical splitter, and the two output ends of the optical splitter are respectively connected to a PC, each The other ...

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Abstract

The invention provides a microwave photon doppler frequency shift measuring system and a regulating method thereof. Electro-optical modulation is realized by a radio-frequency signal and an echo signal through a polarization multiplexing mach-zehnder modulator, balance detecting is combined, through digital signal processing, frequency discrimination information is obtained to realize doppler frequency shift measuring of a broadband radio-frequency signal, meanwhile, second order intermodulation distortion is suppressed in a photocurrent detected by a balance detector, and thus measuring performance of the doppler frequency shift measuring system is greatly improved. According to the adopted broadband microwave photon doppler frequency shift measuring system, PDM-MZM is driven by the ratio-frequency signal in a push-pull mode, and second order intermodulation distortion is suppressed by PBS and balance detecting. The microwave photon doppler frequency shift measuring system and the regulating method thereof are simple in structure and high in operability; and the modulator with the high symmetry degree, accurate bias control, and BPD with good responsivity balance and the high common-mode rejection ratio can be adopted to improve the suppression effect of second order intermodulation distortion so as to realize high-accurate broadband microwave photon doppler frequency shift measurement.

Description

technical field [0001] The invention relates to the field of microwave photon measurement, in particular to microwave photon Doppler frequency shift measurement and its adjustment method. Background technique [0002] Nowadays microwave technology has been widely used in urban environment and national defense field. As the most important basic application of microwave technology, microwave measurement technology has been widely used in aerospace navigation, communication, radar defense system, intelligent transportation system and medical health system. [0003] Doppler radar is a special radar that uses the Doppler effect to obtain long-distance target speed data, and is widely used in aviation, meteorology, radiation, medical and other fields. A key challenge for these Doppler radar systems is to measure the Doppler frequency shift (DFS) with high resolution over a broadband frequency range. Although the DFS estimation realized by traditional electronic technology has ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58G01S13/524G01R29/08
CPCG01S13/58G01S13/524G01R29/0892
Inventor 高永胜康博超樊养余谭庆贵
Owner NORTHWESTERN POLYTECHNICAL UNIV
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