High-resolution measurement of flight time for laser altimeter based on field programmable gate array

被引：0

作者：

Anhui Institute of Optics and Fine Mechanics, Chinese Acad. of Sci., Hefei 230031, China ^{[1
]}

机构：

[1] Anhui Institute of Optics and Fine Mechanics, Chinese Acad. of Sci.

来源：

Zhongguo Jiguang | 2008年 / 5卷 / 752-755期

关键词：

Differential delay lines; Field programmable gate array; Fine time measurement; Laser altimeter; Measurement;

D O I：

10.3788/CJL20083505.0752

中图分类号：

学科分类号：

摘要：

A high-resolution flight time measurement system based on a single field programmable gate array (FPGA) in laser altimeter is designed. The time resolution of 300 ps is obtained, because the differential delay lines are used to perform interpolation and to realize the fine time measurement, and high frequency counter is designed to perform the coarse time measurement. The time splitting circuit, pulse width counter and data transmitter module are integrated in the same chip. At an ambient temperature of 20°C, we achieve a standard deviation of 94.68 ps which equals to 1.42 cm in distance. Furthermore, detection on the ground verifies the feasibility of measuring distance with ±50 cm resolution over 500 km ranges under general conditions.

引用

页码：752 / 755

页数：3

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