Laser measurement system and method

By using a laser measurement system and method, and employing a dual parallel Mach-Zehnder modulator and a photodetector, the function of simultaneously measuring Doppler frequency shift and angle of arrival was realized, solving the problem that simultaneous measurement was not possible in existing technologies. The system has a simple structure and strong anti-electromagnetic interference capability.

CN116338637BActive Publication Date: 2026-05-08INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202211609507.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-12
Publication Date
2026-05-08
Estimated Expiration
2042-12-12

AI Technical Summary

Technical Problem

Existing microwave photonics technology can only measure Doppler shift or angle of arrival individually, and cannot measure both Doppler shift and angle of arrival simultaneously.

Method used

A laser measurement system is used, including an antenna, a microwave source, a laser, a polarization controller, a dual parallel Mach-Zehnder modulator, a photodetector, and a signal processing module. The system performs beat frequency processing on the modulated optical signal to calculate the measurement results of Doppler frequency shift and angle of arrival.

Benefits of technology

It achieves the function of simultaneously measuring Doppler frequency shift and angle of arrival. The system has a simple structure, extremely large operating bandwidth, is not limited by electromagnetic interference, and provides accurate measurement results.

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Abstract

The present disclosure provides a laser measurement system and method, which is applied to the field of microwave photon technology. The system comprises an antenna, a microwave source, a laser, a polarization controller, a double parallel Mach-Zehnder modulator, an electrical coupler, a photoelectric detector and a signal processing module. The antenna is used to receive a return signal, the microwave source is used to emit a reference signal, the polarization controller controls the polarization direction of the optical carrier emitted by the laser, the return signal and the reference signal are modulated onto the optical carrier with the controlled polarization direction through the double parallel Mach-Zehnder modulator, and a modulated optical signal is output, the modulated optical signal enters the signal processing module after frequency mixing processing by the photoelectric detector, and the signal processing module outputs a final result to obtain the measurement results of Doppler shift and angle of arrival at the same time. The present disclosure can realize the simultaneous measurement of Doppler shift and angle of arrival, determine the direction of Doppler shift, and is not limited by electromagnetic interference and working bandwidth, and has a very large working bandwidth.
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