针对传统的雷达测距方法中实现皮秒级的时间测量比较困难;微波计数器及TDC-GP时间数字转换芯片可以达到 皮秒量级的时间测量,但价格昂贵,不能得到广泛应用。文中提出了一种基于时间-电压转换原理,通过积分运算电路将 时间的测量转化为电压的测量,进而达到测量距离的目的。实验结果表明,当系统采用14位A/D转换可以实现6.1 ps的 时延测量,当系统采用16位A/D转换,可以测得1.5 ps的时延。该方法实现简单,并且降低了雷达系统的成本,远距离和 近距离的测量均适用,不存在距离模糊问题。

In the traditional radar ranging method, it is difficult to measure the time of picoseconds. The microwave counter and TDC-GP can realize time measurement, but they can忆t be used widely in the application field because of high cost of the system. To solve these problems, the method of time-voltage conversion is proposed in this paper. The results show that when 14 bit of A/ D converter is adopted in this method, which can measure the time-delay of 6. 1 picoseconds. When 16 bit of A/ D converter is adopted, then 1. 5 picoseconds time-delay can be measured. The ranging method of time-voltage conversion is operated simply, it can be applied to measure different distance, there is no ambiguous distance problem, and the cost of the radar system can be reduced greatly.

天津市自然科学基金资助项目