Signal processing of laser Doppler self-velocimeter |
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| Authors: | Jian Zhou Xingwu Long |
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| Institution: | 1. Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, China;2. College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, Hubei, China;1. Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA;2. AFRL/RYMD, 2241 Avionics Circle, Bldg 620, Dayton, OH 45433, USA;1. Karpenko Physico-Mechanical Institute of NAS of Ukraine, 5 Naukova Str., Lviv, 79060, Ukraine;2. UTP University of Science and Technology, 7 Al. Prof. S. Kaliskiego, Bydgoszcz, 85796, Poland;3. Lviv Polytechnic National University, 12 Bandera Str., Lviv, 79013, Ukraine;4. Ivan Franko National University of Lviv, 1 Universytetska Str., Lviv, 79000, Ukraine |
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| Abstract: | A frequency spectrum refinement and correction algorithm has been put forward to improve the accuracy of measurements, and the Cramer–Rao lower bound (CRLB) of Gaussian group Doppler signal was given based on the introduction of acceleration. Results of simulations and experiments showed that the Goertzel refinement algorithm could improve the resolution of the spectrum of the Doppler signal; the ratio correction algorithm made the results closer to the real value. The CRLBs of the estimated parameters were related to the sampling data, the signal to noise ratio (SNR) and the broadness of Gaussian group, and it can be decreased by increasing the length of the sampling data or improving the SNR; the gap between the variances of the measuring results and the CRLBs narrowed when the SNR of the signal was improved, and was almost eliminated when the SNR was higher than 6 dB. |
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