基于超阈值时间技术的激光关联成像

针对现有基于全波形采样的激光关联成像回波采集数据量大且测距精度和测距分辨率受限于采样率的问题,研究了一种基于超阈值时间(TOT)技术的激光关联成像方法。利用基于TOT技术的时间宽度或峰值反推方法获取回波信号的强度信息,分析了TOT响应阈值选取、激光脉冲宽度、TOT测量误差对激光关联成像重构结果的影响。结果表明:基于TOT技术的回波信号获取方法可以实现激光关联成像;TOT响应阈值选为回波信号峰值的35%、激光脉宽不小于30个采样间隔、TOT测量误差的均方根误差小于1个采样间隔,能够保证较好的重构质量。此外,基于峰值反推获取目标回波信号强度信息的方法比基于TOT的时间宽度表征方法更准确。

Laser Ghost Imaging Based on Time-Over-Threshold Technology

The existing laser-correlated imaging echo based on full waveform sampling experiences the problem of requiring a large amount of collected data for echo,and the limitation of the sampling rate to ranging accuracy and resolution.We propose a new ghost imaging technology based on time-over-threshold(TOT)technology to address this problem.A time width or peak inverse method based on the TOT technology is proposed to obtain the intensity information of the echo signal.The influences of the threshold choice of TOT,laser pulse width,and the measurement error of the ghost imaging reconstruction performance are also studied.Numerical simulation and experimental results demonstrate that the proposed technology can achieve laser correlation imaging.When the threshold is set to 35%of the maximum echo signal,the laser width is wider than 30 sampling intervals,and the root-mean-square error of the measurement error is not greater than 1 sampling interval,the reconstruction quality can be guaranteed.In addition,the method of obtaining the intensity information of echo signal based on peak inverse is more accurate than the time width method based on TOT.