| Citation: | LONG Yanzhi, LIANG Yingjian, HUANG Qiaoping, et al. Design of optical airspeed measurement system based on Doppler shift[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(12): 2521-2527. doi: 10.13700/j.bh.1001-5965.2018.0204(in Chinese)
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In order to solve the defect within traditional airspeed measurement method adopted by helicopter air data system, this paper presents a scheme of airspeed measurement system based on optical and a rapid inversion method of airspeed vector with other airdata. An optical airspeed measurement system is designed based on this method. According to the principle of Mie scattering of aerosol and Doppler effect, the sensor, demodulator and high-speed signal acquisition and processing scheme is optimized in the system. The performance of the system was verified by computer simulation, in which the maximum forward detectable airspeed of the system can reach 450 km/h, and the detection accuracy of true airspeed can be better than ±1 km/h. The optical airspeed measurement system prototype is tested on ground vehicle to compare with the traditional airspeed measurement system, and the effectiveness and reliability of the proposed method and the optical airspeed measurement system are verified.
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