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17 May 2019 Design of high precision digital phase detector in LDDM system
Qinnan Liu, Haili Zhao, Ge Wu, Peng Liu, Zeliang Yan
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Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111701T (2019) https://doi.org/10.1117/12.2533548
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China
Abstract
The LDDM system is a measurement system mainly used for medium and short-range precision displacement data, especially in the field of practical engineering. In the LDDM system, the accuracy and speed of measurement system depend directly on the design of phase discriminator system. This article introduces a new high-precision digital phase detector based on FPGA hardware platform. It uses improved CIC filter and CORDIC function to design the module. Firstly two orthogonal local oscillator signals are generated, and multiply the two signals separately by the signal to be measured. After the modified CIC filter, the phase difference between the local oscillator signal and the signal containing only DC information is calculated by the CORDIC algorithm solving module. Finally, the phase difference of the signal to be measured is obtained by subtracting the phase difference between the two channels. The results of Matlab and Modelsim simulation and hardware platform experiments show that the high-precision digital phase detector designed in this article achieves a good level of measurement speed and measurement accuracy. The experimental phase error is only 1.03×10-4 rad, and the accuracy reached 0.0515%.With the addition of 30dB noise, the average phase discrimination error of 20 times is 1.02×10-4 rad, which achieve a high accuracy. It is important to achieve a higher accuracy displacement measurement for the LDDM system.
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Qinnan Liu, Haili Zhao, Ge Wu, Peng Liu, and Zeliang Yan "Design of high precision digital phase detector in LDDM system", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111701T (17 May 2019); https://doi.org/10.1117/12.2533548
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KEYWORDS
Field programmable gate arrays
Filtering (signal processing)
Signal detection
Electronic filtering
Digital filtering
MATLAB
Signal processing
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