| Citation: | PAN Ying-ling, JI Rong-yi, DONG Deng-feng, LI Jia-meng, ZHOU Wei-hu. In-phase frequency detection method for frequency-sweep amplitude-modulation laser ranging[J]. Chinese Optics. doi: 10.37188/CO.2025-0159
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Frequency-sweep Amplitude-modulation Laser Ranging (FSAMLR) is a ranging method that determines the target distance by solving for the in-phase frequency, characterized by high measurement accuracy and low system complexity. To address issues such as the low signal-to-noise ratio in sampled waveforms containing in-phase frequencies and the resulting limitations in solving accuracy, a method based on Singular Spectrum Analysis combined with Local Parabolic Fitting (SSA-LPF) is proposed. The principle of FSAMLR is outlined, emphasizing that ranging accuracy depends on the precision of the in-phase frequencies. Subsequently, simulations compare the solving accuracy of in-phase frequencies among the swing method, parabolic fitting, cubic fitting, and quartic fitting, using identical sampled waveforms filtered via the SSA method. Parabolic fitting is verified to enhance solution accuracy. Simulation results demonstrate that parabolic fitting achieves a 95.7% reduction in mean absolute deviation relative to the swing method and a 65.6% improvement over other least-squares fitting methods. Experimental analysis indicates that the SSA-LPF method yields a ranging standard deviation below 30 μm across varying distances and sweep steps. Adopting the SSA-LPF method in FSAMLR enhances ranging efficiency while maintaining high ranging accuracy.
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