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Coherent homodyne Doppler velocity measurement laser radar system based on optical orthogonal demodulation

A Doppler velocity measurement and quadrature demodulation technology, which is applied in the field of coherent homodyne Doppler velocity measurement lidar systems, can solve the problems of difficulty in distinguishing the velocity direction, short range of action, and high requirements for lasers, and achieves simple structure and reduced power consumption. effect of demand

Inactive Publication Date: 2015-12-09
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to propose a coherent homodyne Doppler speed-measuring lidar system based on optical quadrature demodulation based on the existing coherent Doppler speed-measuring lidar technology, to solve the problem of the existing coherent Doppler speed-measuring laser radar system. The radar speed direction is difficult to distinguish, and the requirements for the laser are high, and the working distance is short

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  • Coherent homodyne Doppler velocity measurement laser radar system based on optical orthogonal demodulation
  • Coherent homodyne Doppler velocity measurement laser radar system based on optical orthogonal demodulation
  • Coherent homodyne Doppler velocity measurement laser radar system based on optical orthogonal demodulation

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Embodiment Construction

[0044] The specific implementation of the coherent homodyne Doppler speed measurement lidar system based on optical quadrature demodulation includes:

[0045] 1) The digital signal processing module 9 switches the transmitting optical switch 3 and the receiving optical switch 4 to the same first channel, and triggers the narrow linewidth laser 5 to emit. The digital signal processing module adopts FPGA of XilinxVirtex4XC4VSX55, the transmitting optical switch 3 is a magneto-optical switch with 1 input and 3 outputs, the receiving optical switch 4 is a magneto-optical switch with 3 inputs and 1 output, and the narrow linewidth laser 5 is a narrow linewidth fiber laser , the wavelength is 1550nm, the line width is less than 30kHz, the high power for emission is 3W, and the small power for local oscillator is 3mW.

[0046] 2) The laser is input through port 1 of the circulator 2, output from port 2 to the transceiver telescope 1 for emission, the echo laser returns from the trans...

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Abstract

The invention discloses a coherent homodyne Doppler velocity measurement laser radar system based on optical orthogonal demodulation. The system is applied to coherent laser radar systems. The system includes co-axial transmit-receive telescopes, optical fiber circulators, a light transmitting switch, a light receiving switch, a narrow line-width laser, a 90-degree optical bridge, balanced detectors, high-speed ADCs, and a digital signal processing module. The coherent homodyne Doppler velocity measurement laser radar system of the invention directly obtains the size and the direction of the difference value between an echo signal frequency and a local oscillation frequency based on the optical orthogonal demodulation, and obtains the sizes and directions of a target velocity in multi-directional time-sharing.

Description

technical field [0001] The invention relates to laser radar technology, in particular to a coherent homodyne Doppler speed measuring laser radar system based on optical quadrature demodulation. Solved the problem that the speed direction of the Doppler speed measuring lidar is difficult to distinguish. Background technique [0002] The current coherent speed measurement lidar is divided into heterodyne detection and homodyne detection according to whether the local oscillator or the transmitted signal undergoes fixed frequency shift. In heterodyne detection, the local oscillator or transmitted signal undergoes a fixed frequency shift, and the frequency change of the echo signal is obtained when the echo is mixed. The frequency value includes the fixed frequency shift, and the Doppler can be obtained by subtracting the fixed value. The magnitude and sign of the Le frequency. However, a coaxial transceiver system is often used in typical small lidar systems, which will produ...

Claims

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Application Information

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IPC IPC(8): G01S17/58
CPCG01S17/58
Inventor 吴军舒嵘徐卫明童鹏
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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