用于机载激光测深系统的时间间隔测量模块

机载海洋激光测深系统不仅要求精确测量激光从海表的入射点到海底目标点之间的距离，还要精确测定飞机到海表入射，点之间的距离，为水深数据的海浪校正而确定平均海平面以及波高。为此设计和研制了一高精度时间间隔测量器，该单元基于专用时间数字转换芯片开发，采用延迟线插入法技术，双通道工作，具有高时间分辨率(最高可达250ps)和高测量重复率的特性。给出硬件和软件设计方法以及单元的测试结果。

In order to get the accurate depth of shallow water in a lidar bathymetry, it requires to measure the distance between sea surface and bottom,and the distance between airplane to sea surface. It is very helpful for the post-data process to get the mean ocean surface and the wave height. A high resolution time interval module is developed to get the high accurate distance between airplane to sea surface. The module is based on ASIC TDC chip with the technique of the delay-line interpolation. The module has two channels with a resolution as high as 250 ps, respectively. The hardware and software of the module and the testing results are presented.