Optimization of the signal processing in frequency modulated continuous wave laser ranging system

Xiangsong Meng; Fumin Zhang; Xinghua Qu

doi:10.1117/12.2180836

6 March 2015 Optimization of the signal processing in frequency modulated continuous wave laser ranging system

Xiangsong Meng, Fumin Zhang, Xinghua Qu

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94461Q (2015) https://doi.org/10.1117/12.2180836
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

Abstract

Based on a dual interferometry frequency modulated wave laser (FMCW) laser ranging system, three steps to optimize the signal processing is proposed in this paper. The first step is signal re-sampling, by which the sampling signal is turned to be equal optical frequency intervals. The second step is splicing the re-sampled signal, by which can break though the tuning range of the laser source limitation. The last step is the all-phase pretreatment of the signal, its means that the all-phase Fast Fourier Transformation (apFFT) is used to handle the re-sampled signal, which could reduce the phase error of the signal. The experiments shows that the noise effect due to the tuning nonlinearity of laser can be reduced by re-sampling the signal, 50μm range resolution can be easily obtained by this method, the apFFT is more reliable and effective than FFT in the processing to reduce the phase error and improve the speed of operation.

Citation Download Citation

Xiangsong Meng, Fumin Zhang, and Xinghua Qu "Optimization of the signal processing in frequency modulated continuous wave laser ranging system", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94461Q (6 March 2015); https://doi.org/10.1117/12.2180836

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