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

Yichen Lu; Yinliang Jia; Dengfeng Dong; Yuxuan Meng; Yingling Pan; Yifang Fang; Mengxin Du

doi:10.1117/12.3010766

1 November 2023 Research on a high-precision phase discrimination system for laser ranging based on FPGA

Yichen Lu, Yinliang Jia, Dengfeng Dong, Yuxuan Meng, Yingling Pan, Yifang Fang, Mengxin Du

Proceedings Volume 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023); 1291706 (2023) https://doi.org/10.1117/12.3010766
Event: 3rd International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 2023, Shanghai, China

Abstract

Phase laser ranging technology is a significant approach for large-scale and high-precision measurement. Improving the precision of phase ranging by increasing the modulation frequency is considered as one of the most effective methods. However, the maximum sampling frequency of A/D devices limits the sampling rate of high-frequency modulated signals, which means that the modulation frequency cannot be increased infinitely. So, the using of under-sampling for high-speed and highfrequency modulation signals is proposed in this paper. The feasibility of this method is analyzed and verified. For further improvement in ranging precision, the advantage of all phase fast Fourier transform (apFFT) is analyzed by simulation. In addition, Kalman filtering technology is adopted in this paper to suppress noise in the system to improve the precision of phase discrimination. Based on the simulation results, a high-precision phase discrimination system using FPGA is designed in this paper. According to experimental results, when the modulation frequency is 1.616GHz and the sampling frequency is 1.6GHz, the ranging stability of the system can reach ±10.8ߤ݉ and the speed of phase discrimination can reach 2712 times per second.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yichen Lu, Yinliang Jia, Dengfeng Dong, Yuxuan Meng, Yingling Pan, Yifang Fang, and Mengxin Du "Research on a high-precision phase discrimination system for laser ranging based on FPGA", Proc. SPIE 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 1291706 (1 November 2023); https://doi.org/10.1117/12.3010766

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KEYWORDS

Ranging

Phase shift keying

Modulation frequency

Tunable filters

Electronic filtering

Signal filtering

Laser frequency

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