摘要
高精度时间测量技术在激光测距中有着重要作用,而时钟信号周期误差是影响时间测量精度的关键。传统的时钟周期校准往往只将测量过程中最后一个时钟周期的误差作为校准参数,无法对整个测量过程中的误差进行补偿。针对这一问题,提出了脉冲激光测距中高精度时间测量时钟信号误差补偿的方法,通过测量计时芯片在不同时间下的时钟周期误差,构造误差曲线以对测量结果进行补偿,提升了时间测量系统的测量精度。使用TDC-GP22专用计时芯片设计了时间测量系统并进行了测试。测试结果表明,系统平均绝对误差为0.38 ns,最小误差可达到65 ps。
High-precision time measurement technology plays an important role in laser ranging,and clock signal cycle error is the key to affect the accuracy of time measurement.Conventional clock cycle calibration often only uses the error of last clock cycle in measurement process as a calibration parameter,and cannot compensate for the error during the entire measurement process.Aiming at this problem,a method of clock signal error compensation for high precision measurement in pulsed laser ranging is proposed.By measuring the clock cycle error of the timer chip at different times,an error curve is constructed to compensate the measurement result,which improves the measurement accuracy of the time measurement system.The time measurement system is designed and tested using the TDC-GP22 dedicated timing chip.The test results show that the system average absolute error is 0.38 ns and the minimum error can reach65 ps.
作者
余浩
赵旭
苏中
YU Hao;ZHAO Xu;SU Zhong(Key Laboratory of Modern Measurement&Control Technology,Ministry of Education,Beijing Key Laboratory of High Dynamic Navigation Technology,Beijing Information Science&Technology University,Beijing 100101,China)
出处
《激光杂志》
北大核心
2020年第7期23-26,共4页
Laser Journal
基金
国家自然科学基金(No.61771059、61801032)
北京市自然科学基金(No.3184046)
高动态导航技术北京市重点实验室开放课题。
