矢量内积法高速相位式激光测距技术

测量速度和测量精度是相位式激光测距系统的两个重要指标。针对高速高精度测距需求，研究了基于矢量内积(Vector Inner Product, VIP)法的高速数字鉴相方法，从鉴相计算的点数、鉴相计算速度和鉴相精度等方面对VIP法的鉴相性能进行了仿真分析和实验测试，并与传统的数字频域鉴相法(Discrete Fourier Transform, DFT)进行了性能对比。仿真和实验结果表明，VIP法具有更高的鉴相速度和鉴相精度，当信号调制频率为50 MHz时，基于高速采样板卡实测得到的鉴相精度优于0.1°，测距精度0.2 mm以内，相同计算点数VIP法的鉴相处理速度是DFT法的3倍。研究结果表明，VIP法具有鉴相精度高、鉴相速度快的优点，适用于高速高精度激光测距系统。

High-speed phase laser ranging technology based on vector inner product method

Measurement speed and measurement accuracy are two important indicators of the phase laser ranging system. Aiming to the needs of high-speed and high-precision ranging system, a high-speed digital phase detection method based on the Vector Inner Product (VIP) method was studied. The phase detection performance of the VIP method was simulated and tested in terms of the number of phase detection calculation points, phase detection calculation speed, and phase detection accuracy. The simulation and experimental results were compared with the traditional digital frequency domain phase detection method (Discrete Fourier Transform (DFT) method), which show that the VIP method has higher phase detection speed and phase detection accuracy. When the signal modulation frequency is set as 50 MHz, based on high-speed sampling board, the measured phase detection accuracy is better than 0.1°, the ranging accuracy is within 0.2 mm, the phase detection processing speed of the VIP method is 3 times faster than that of the DFT method under the circumstance with the same number of calculation points. Referring to the high phase detection accuracy and fast phase detection speed, all the analysis data show that the VIP method has the significant advantages, which is suitable for the high-speed and high-precision laser ranging systems.