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摘要
The measurement error of a double-edge wind lidar caused by a disturbed Fabry-Perot interferometer (FPI) is analyzed. Several error sources such as air pressure variations, temperature changes, and mechanical vibrations are considered in the measurement-error model. The simulation results show that a double-edge wind lidar is so sensitive to environmental variations that the measurement error reaches /- 60 m/s if the FPI is not stabilized. In order to compensate the external disturbance acting on the FPI, a nonlinear proportional-integral-derivative (PID) control scheme is designed based on the transmission measurement of the calibration channel. An arc tangent function is used to improve the feedback gain of the usual PID control design. The results show that with the new controller the measurement accuracy of the wind lidar can be improved 4-5 times in comparison with the usual control design, and the range of the measurement error is only /- 3 m/s.
- 出版日期2009-1
- 单位哈尔滨工业大学
