Laser Feedback FMCW Ranging System Based on Multiple-Equal-Phase-Subdivision Resampling

Frequency Acquisition Approach in Polarization-Modulated Ranging Based on Lock-in Analysis

“…Segmented binomial fittings are then applied to determine the frequency values corresponding to the minimized value of the fitted function. Finally, the distance value is computed according to Expression (8).…”

“…Segmented binomial fittings are then applied to determine the frequency values corresponding to the minimized value of the fitted function. Finally, the distance value is computed according to Expression (8). Figure 3a displays the raw intensity signal obtained through direct detection, encompassing various frequency components.…”

“…These points are used for segmented linear fitting to determine the frequency value corresponding to the intersection point of the fitted function. Finally, the distance value is calculated according to Equation (8).…”

“…Laser-ranging technology, distinguished by its high resolution, robust coherence and exceptional interference resistance, finds extensive application in aerospace, large-scale equipment production, energy-related equipment and manufacturing processes [1][2][3]. Common laser-ranging techniques encompass the timed pulse method [4], phase comparison method [5], frequency-modulated continuous wave (FMCW) method [6][7][8][9][10][11][12] and femtosecond frequency comb method [13][14][15][16]. The timed pulse method, while widely used, offers a limited resolution; therefore, it is not suitable for industrial applications.…”

Research on a high-precision phase discrimination system for laser ranging based on FPGA

“…Phase ranging technology is extensively utilized in aviation, aerospace, high-speed railway, and other industries due to its highprecision, high-speed, and high-stability [1] . Its integration with CCD imaging technology has made it an indispensable tool for large-scale and precision measurement applications [2] . The precision requirement for high-end equipment manufacturing enhanced from sub-millimeter to tens of microns.…”