基于Simulink的时刻鉴别模块误差分析
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摘要
时刻鉴别模块的定时精度是脉冲激光三维成像系统距离分辨率的主要影响因素,选择合适的时刻鉴别方法对系统设计具有重要意义。本文依靠Simulink模数混合仿真特点,在Simulink中对前沿阈值、恒比定时及高通容阻等几种时刻鉴别方法进行了实现,并根据系统参数自定义激光波形,分析了激光脉宽在0.1~10 ns、入射角在50°~90°及目标距离在0.1~10 km等情况下恒比定时法及高通容阻法的定时误差。仿真结果证明高通容阻法要略优于恒比定时法。相较于从统计学角度分析时刻鉴别总体误差,这种方法能够更好地结合激光波形特征和电路特性动态反映各种时刻鉴别方法在不同情况下的定时误差,为实际应用中的时刻鉴别方法选择提供参考。
The precision of time discrimination module is the main influence factor for the range resolution of pulse laser 3 D imaging system,and the selection of time discrimination methods has an important significance for system design. Some typical methods of time discrimination in the Simulink were realized,such as frontier threshold,CFD and CR-high pass time discrimination. Combined with simulation of laser echo,the errors of CFD and CR-high pass time discrimination were analyzed under the conditions of pulse width from 0. 1 ~ 10 ns,incidence angle from 50° to 90° and target distance from 0. 1 ~ 10 km. Simulation results show that the error of CR-high pass time discrimination is better than that of CFD. Comparing with statistical analysis,this method can dynamically show the errors of various time discrimination methods under different circumstances based on laser waveform feature and circuit characteristics,which provides a reference for the selection of time discrimination methods in the practical application.
The precision of time discrimination module is the main influence factor for the range resolution of pulse laser 3 D imaging system,and the selection of time discrimination methods has an important significance for system design. Some typical methods of time discrimination in the Simulink were realized,such as frontier threshold,CFD and CR-high pass time discrimination. Combined with simulation of laser echo,the errors of CFD and CR-high pass time discrimination were analyzed under the conditions of pulse width from 0. 1 ~ 10 ns,incidence angle from 50° to 90° and target distance from 0. 1 ~ 10 km. Simulation results show that the error of CR-high pass time discrimination is better than that of CFD. Comparing with statistical analysis,this method can dynamically show the errors of various time discrimination methods under different circumstances based on laser waveform feature and circuit characteristics,which provides a reference for the selection of time discrimination methods in the practical application.
引文
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[3]ZHENG Ruitong,WU Guanhao.Pulsed one-dimensional scannerless Li DAR system based on linear APD array[J].Infrared and Laser Engineering,2012,41(1):96-100.(in Chinese)郑睿童,吴冠豪.基于线阵APD探测器的脉冲式一维非扫描激光雷达系统[J].红外与激光工程,2012,41(1):96-100.
[4]XU Wanpeng,HUANG Genhua.Research on advanced technology of time measurement for LIDAR based on constant-fraction discrimination[J].Infrared,2014,35(4):18-24.(in Chinese)许万鹏,黄庚华.基于恒比定时鉴别的激光雷达时间测量前沿技术研究[J].红外,2014,35(4):18-24.
[5]Binkley D M.Performance of non-delay-line constant-fraction discriminator timing circuits[J].Nuclear Science,IEEE Transactions on,1994,41(4):1169-1175.
[6]YANG Tao,ZHAO Bo,ZHANG Chi.Development of a non-delay-line constant-fraction discriminator[J].Nuclear Electronics&Detection Technology,2002,22(3):244-246.(in Chinese)杨涛,赵波,张弛.一种无延迟线的恒比定时器[J].核电子学与探测技术,2002,22(3):244-246.
[7]Wang F,Zhao Y,Zhang Y,et al.Range accuracy limitation of pulse ranging systems based on Geiger mode single-photon detectors[J].Applied optics,2010,49(29):5561-5566.
[8]Steinvall O,Chevalier T.Range accuracy and resolution for laser radars[C]//European Symposium on Optics and Photonics for Defence and Security.International Society for Optics and Photonics,2005:598808-598808-16.
[9]YAO Pingping,TU Bihai,WANG Xiangjing,et al.Design and application of high-precision threshold circuit for laser proximity fuze[J].Infrared and Laser Engineering,2014,43(4):1156-1161.(in Chinese)姚萍萍,涂碧海,王相京,等.高精度激光近炸引信阈值电路设计与应用[J].红外与激光工程,2014,43(4):1156-1161.
[10]ZHAO Yuan,XU Yuannan,JIN Chenfei,et al.Theoretical analysis on range accuracy of gain-modulated scannerless lidar[J].Infrared and Laser Engineering,2009,38(2):313-317.(in Chinese)赵远,许元男,靳辰飞,等.增益调制非扫描激光雷达测距精度的理论分析[J].红外与激光工程,2009,38(2):313-317.
[11]LI Lei,HU Yihua,ZHAO Nanxiang,et al.Experiment on the stretching characteristics of pulse width of laser remote sensing echo[J].Infrared and Laser Engineering,2010,39(2):246-250.(in Chinese)李磊,胡以华,赵楠翔,等.激光遥感目标回波脉宽展宽特性实验[J].红外与激光工程,2010,39(2):246-250.
[12]HU Yihua.Laser imaging target reconnaissance[M].Beijing:National Defense Industry Press,2013.(in Chinese)胡以华.激光成像目标侦察[M].北京:国防工业出版社,2013.