Echo Characteristics and Range Error for Pulse Laser Ranging

Gengcheng, 谢庚承 Xie; Yidong, 叶一东 Ye; Jianming, 李建民 Li; Xuewen, 袁学文 Yuan

doi:10.3788/cjl201845.0610001

Cited by 3 publications

(4 citation statements)

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“…This design uses the STOP1 channel of the chip, and uses the rising edge to touch the START signal to start the timing, and the falling edge to trigger the STOP signal to complete timing cycle of the TDC. the START signal is generated by the FPGA with the same signal that drives the laser to emit the PWM signal in order to ensure the accuracy of the timing [10] .…”

Section: Tdc Timer Modulementioning

confidence: 99%

Design of an autonomous and controllable laser ranging system

Wei,

Tang,

Long

et al. 2024

International Conference on Optoelectronic Materials and Devices (ICOMD 2023)

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Section: Tdc Timer Modulementioning

confidence: 99%

Design of an autonomous and controllable laser ranging system

Wei,

Tang,

Long

et al. 2024

International Conference on Optoelectronic Materials and Devices (ICOMD 2023)

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“…The 3D imaging of space targets usually involves a Q modulated solid-state laser with 00 TEM mode, whose laser output power waveform 0 P in the time domain is shown in Equation (1) [10],…”

Section: Lasermentioning

confidence: 99%

“…The paper [8] considered the effect of the target shape on the waveform and simplified the target to a Lambertian body, ignoring the effect of the target material on the waveform, but the space target does not fully conform to the characteristics of a Lambertian body. The papers [9,10] analyzed the effect of target material and attitude on Lidar echoes with single unit detector but did not extend to the array detector. Wang [11] and Chen [12] have also investigated space target 3D imaging simulations for position measurement.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Simulation of Space-Based LM-APD 3D Imaging

Wang

Lin²,

Zhang³

et al. 2023

Electronics

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The linear mode avalanche photodiode (LM-APD) array has the capability of real-time 3D imaging for moving targets, which is a promising 3D imaging means in space. The main system parameters of the LM-APD array 3D imaging system, the characteristics of the space target itself, and the relative positional relationship between them will affect the 3D imaging results at the same time, and there is a need for an appropriate simulation method to describe the space target point cloud acquired by the LM-APD array 3D imaging system under different conditions. We propose a simulation method for the 3D imaging of space targets with LM-APD arrays, which takes the characteristics of the space targets and the relative position into consideration, and build a link from the laser to the receiving system to simulate the echo waveform of each pixel in the LM-APD array. The experiment results under different conditions show that the proposed simulation method can accurately describe the imaging results of the LM-APD array 3D imaging system for space targets with different shapes, materials, and motion states, which providing theoretical and data support for the design of LM-APD array 3D imaging systems.

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Photon echo probability distribution characteristics and range walk error of small translational target for photon ranging

Hou¹,

Hu²,

Fang³

et al. 2022

Acta Phys. Sin.

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<sec>The photon counting Lidar enhances the signal-to-noise ratio of the echo signal and reduces the number of photons required for signal analysis, thereby improving the detection range and measurement accuracy. At present, the photon counting Lidar is mainly used to detect stationary targets, and the mechanism of the influence of long-distance target motion characteristics on the photon echo probability distribution is still unclear. Therefore, it is urgent to study the photon ranging performance of long-distance moving targets.</sec><sec>In this paper, the probability distribution model of photon detection echo of moving targets is established, and a Monte Carlo model for photon detection of arbitrary targets is given. Through experimental comparison, the correctness of the Monte Carlo simulation model is verified. Furthermore, the probability distribution characteristics of the laser echo and photon echo of a small rectangular target in translation within a detection period are compared. And the variation law of the probability distribution of photon detection under different translational speeds is analyzed. In addition, the relationship between the photon ranging error and the translational speed of the target is discussed.</sec><sec>The results show that the photon echo probability distribution of the translational target is more forward and the width is narrower than the laser pulse echo probability distribution. Compared with the extended target, the detection probability of the translational small target is significantly reduced, and the maximum average echo photon number is <inline-formula><tex-math id="M6">\begin{document}$ 1/10 $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M6.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M6.png"/></alternatives></inline-formula> times that of the extended target, as a result, the photon detection of the translational target requires higher laser pulse energy. When the length of target is 1m, the range walk error reaches a maximum value at a speed of <inline-formula><tex-math id="M7">\begin{document}$25\;{\text{m/s}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M7.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M7.png"/></alternatives></inline-formula>, i.e. <inline-formula><tex-math id="M8">\begin{document}$6.72\;{\text{ cm}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M8.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M8.png"/></alternatives></inline-formula>, which is <inline-formula><tex-math id="M9">\begin{document}$ 1/2 $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M9.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="7-20211998_M9.png"/></alternatives></inline-formula> times that of the extended target. With the increase of the translational speed, the range walk error first increases and then turns stable with the light spot acting as the boundary.</sec><sec>The method proposed in this paper can be further extended to photon detection and ranging of targets with other shapes, materials and attitudes. The research results provide a theoretical basis for the correction and performance improvement of the photon ranging of moving target. Furthermore, it lays the foundation for the detection of moving targets and accurate acquisition of information by photon counting Lidar.</sec>

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Echo Characteristics and Range Error for Pulse Laser Ranging

Cited by 3 publications

References 0 publications

Design of an autonomous and controllable laser ranging system

Design of an autonomous and controllable laser ranging system

Analysis and Simulation of Space-Based LM-APD 3D Imaging

Photon echo probability distribution characteristics and range walk error of small translational target for photon ranging

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