基于时钟移相相或的高精度脉冲对产生方法

Clock Phase Shift and OR Operation for High Precision Pulse-pairs

针对超分辨率三维选通成像中同步控制脉冲对精度低的问题,提出了时钟移相相或的高精度脉冲对产生方法。该方法首先对可编程器件的系统时钟进行等差相位的数字移相产生多路时钟信号,再根据脉冲对中延时值和脉宽值选择对应的两路时钟产生脉宽信号,最后将两路脉宽信号进行相或运算得到高精度的脉冲对信号。实验表明,该方法可以将延时和脉宽的控制精度提高到1ns,优于传统脉冲产生方法的5ns精度,使超分辨率三维选通成像系统在直径2.5m视场内的距离分辨率达到1cm,为对更小目标进行成像和识别提供技术基础。

A method of clock phase shift and OR operation was put forward for high precision synchronous con-trol pulse-pairs in 3D super-resolution range-gated imaging. Firstly, multi channel clock signals were generated by shifting phase arithmetically for the system clock. In the next place, two of the clock signals were chosen based on the pulse width and the delay for two pulse signals. Finally, high precision synchronous control signals were generated by the OR operation with the two pulse signals. Experiments results showed that the proposed method could attain the precision of 1 ns for delay and pulse width and the range resolution could reach 1 cm in field of view with 2. 5 meters in diameter, which could make it possible to image and identify smaller target for 3D super-resolution range-gated imaging.