利用正弦幅值时间转换的脉冲激光测距方法

提出了一种利用正弦幅值时间转换的高精度脉冲激光测距方法,该方法以正弦信号作为时间基准,采用倍频和时钟分相技术,通过调节脉冲发射延时,控制回波脉冲定时点落在基准正弦波的0～π/4区间,然后对这一区间进行分段线性插值处理,将正弦幅值的变化转换为定时时间,实现高精度测距.该方法原理结构简单、容易实现.实验结果表明:在激光发射平均功率为1 mW时,在无合作目标测程300 m内,测距精度为±(5 mm+3 ppm).

Pulse Laser Ranging Using Sinusoidal Amplitude Time Conversion

In this study,a high-precision pulse laser ranging method,employing sinusoidal amplitude time conversion,is proposed.The method uses a sinusoidal signal as a time reference,and frequency doubling and the clock phase separation technique to control the echo pulse timing by adjusting the pulse emission delay.The signal falls within the 0-∏/4 interval of the reference sine wave,and then effects piecewise linear interpolation for the given interval to convert the variation of the sinusoidal amplitude into the time required for achieving high-precision ranging.The underlying principle of the method is simple and easy to implement.The experimental results show that when the average power of laser emission is 1 mW,the range accuracy is±(5 mm+3 ppm)within 300 m without a cooperation target.