Data processing method for coherent homodyne velocimetry lidar with optical quadrature demodulation
A technology of quadrature demodulation and lidar, which is used in measurement devices, re-radiation of electromagnetic waves, radio wave measurement systems, etc., can solve the problems of difficulty in distinguishing the speed direction, short operating distance, and high requirements for lasers, so as to reduce the demand, simple structure
Active Publication Date: 2017-12-26
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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[0006] The purpose of the present invention is to propose a data processing method of 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 existing coherent multiple It is difficult to distinguish the speed direction of the Puler speed measurement lidar, and it has high requirements on the laser and the problem of short operating distance
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[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 the FPGA of Xilinx Virtex 4XC4VSX55, 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 line width laser 5 is a narrow line width Fiber laser, wavelength 1550nm, line width less than 30kHz, high power 3W for emission, low power 3mW for local oscillator.
[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 transceiver telescope to port 2 ...
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The invention discloses a data processing method for coherent homodyne speed measurement laser radar with optical orthogonal demodulation. The data processing method is applied to a coherent homodyne Doppler speed measurement laser radar system based on optical orthogonal demodulation. The data processing method comprises the steps that data of a channel I and a channel Q which have an orthogonal property are obtained from a high-speed ADC in the coherent homodyne Doppler speed measurement laser radar system, the different value and the direction of echo signal frequency and local oscillator optical frequency are directly obtained by conducting orthogonal demodulation in a complex field, and the speed and direction of a target are obtained. The real-time signal processing technology and the pulse accumulation technology are adopted so that the system can reach a long action distance; meanwhile, multi-path optical switch switching is adopted in the system, and thus speed information in multiple directions is measured in a time-share mode.
Description
technical field [0001] The invention relates to laser radar technology, in particular to a data processing method of a coherent homodyne Doppler speed measuring laser radar system with 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 s...
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IPC IPC(8): G01S17/58G01S7/487
CPCG01S7/4873G01S17/58
Inventor 吴军舒嵘徐卫明童鹏
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI