Ji Ningke, Zhang Fumin, Qu Xinghua, Zhang Tong, Zhang Tieli, Liu Xiaoxu, Xie Yang. Ranging Technology for Frequency Modulated Continuous Wave Laser Based on Phase Difference Frequency Measurement[J]. Chinese Journal of Lasers, 2018, 45(11): 1104002
- Chinese Journal of Lasers
- Vol. 45, Issue 11, 1104002 (2018)
Fig. 1. (a) Curves of modulated frequency versus time; (b) a serious broadened spectrum signal
Fig. 2. Schematic of FMCW ranging system with double optical path
Fig. 3. Schematic of phase difference signal delay
Fig. 4. Theoretical distance and distances obtained from phase difference frequency measurement algorithm and FFT. (a) Whole curves; (b) partial enlarged figure
Fig. 5. Residual errors between theoretical distance and distance from phase difference frequency measurement or FFT
Fig. 6. Physical photo of the measurement system
Fig. 7. Measurement stability at different positions
Fig. 8. (a) Measured distance with the phase difference frequency measurement algorithm; (b) measuring range residual error with two methods
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Table 1. Theoretical distance and distances obtained from phase difference frequency measurement algorithm and FFT at different positions
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Table 2. Measured distances at different positions
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