共查询到20条相似文献,搜索用时 406 毫秒
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将激光雷达安置于坐标原点,利用激光雷达测定平面上目标点坐标(r,θ),实现对目标点的定位。为了避免激光雷达测量上的视野盲区,设置激光雷达在平面上360°旋转对空间进行扫描捕获目标点,为了消除激光雷达位于一固定点对目标点的定位,导致定位测量上数据的单一性,将激光雷达置于一移动平台,构建动态坐标系,测量与平台同平面目标点相对激光雷达位置的坐标(ri,θi),通过坐标转换,将多次测量的坐标平均值作为目标点的定位坐标值,实现对平面上特征点的定位,最后利用MATLAB进行数据处理绘图。 相似文献
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利用Fernald迭代后向积分法反演低空探测机载激光雷达消光系数 总被引:2,自引:0,他引:2
进行低空探测的机载激光雷达消光系数反演存在着标定点选取和标定值确定两大困难.Fernald迭代后向积分法能够在不利用其它辅助没备的情况下,找到进行低空探测机载激光雷达消光系数反演所需的标定点和标定值.利用Fernald迭代后向积分法和Palm et a1.(2002)方法分别对青岛机载激光雷达实验数据进行处理,得到的两条消光系数廓线基本吻合.定蜃分析显示:利用Fernald迭代后向积分法进行机载激光雷达消光系数反演时,激光雷达比对消光系数反演结果影响很大;标定点的消光系数值及迭代判据的取值对机载激光雷达消光系数反演的结果影响较小.Fernald迭代后向积分法为不用其它辅助设备进行低空探测的机载激光雷达消光系数反演提供了一种可行的范例. 相似文献
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云宏微观参数的探测对云物理和气候变化研究具有重要意义。激光雷达是实现云宏微观参数高时空分辨率探测的有效的重要科学仪器。回顾和总结了激光雷达在云参数探测中的主要技术及其研究进展,讨论了激光雷达在云探测研究中的不足和局限性及目前在云探测应用中亟待解决的关键问题,展望了激光雷达未来在云探测中的应用潜力,并提出了研究思路与方案。内容涉及云检测和云相态识别的多波长及偏振激光雷达和云内温度、湿度、风速风向与垂直气流探测等激光雷达技术与方法,分析讨论了云系降水潜力探测的激光雷达应用案例。激光雷达对于探测初生云团及稀薄云层具有较好的穿透性及精细探测优势,但对于强对流云等厚云层,需将其与其他探测手段如微波雷达等联合观测,并开展多源数据融合技术研究,以实现云全生命周期的精细化监测。随着激光与光电子技术和大数据及人工智能技术的发展,激光雷达技术日趋成熟,面向业务化应用所需的系统稳定性、可靠性及探测能力的激光雷达产品将越来越受到气象与环境领域行业专家的关注,并将在云探测领域中发挥越来越重要的作用。 相似文献
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《光学技术》2021,47(5):537-541
荧光激光雷达技术作为长距离探测有机气溶胶的主要手段之一,常用于有机气溶胶的探测、预警、识别与追踪,为了尽早发现有机气溶胶防止危害,提高荧光激光雷达系统探测时间分辨率及预警速度具有重要意义。针对以上荧光激光雷达对高时间分辨率、响应快的需求,提出了一种数据采集系统设计方案,该系统基于生产者/消费者模式将激光雷达信号探测过程分为数据生产和数据消费两模块,结合软件多线程技术降低了两模块的耦合度,提高了两模块的并行度,有效地缩短了荧光激光雷达的探测周期。测试结果表明,当荧光激光雷达多脉冲累加采集周期为100ms,单次触发采样点数量为20000时,激光雷达探测时间分辨率的实际提升率达到40.51%,且与理论公式具有良好的一致性,该系统可以应用于荧光激光雷达的高时间分辨率数据采集。 相似文献
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A method is proposed to aid in the comparison of spaceborne lidar measurements with ground-based lidar measurements. The downward attenuated backscatter is constructed from ground-based lidar data, and then compared to the attenuated backscatter measured by spaceborne lidar. To test the accuracy of the method, sensitivity analysis is performed. This method is applied to compare the measurements between the CALIPSO lidar and ground-based lidar at Hampton University. The comparison results show this method is a feasible and reasonable approach for spaceborne lidar validation. Moreover, it can help to retrieve aerosol optical properties. 相似文献
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米散射激光雷达测量大气水平能见度 总被引:1,自引:0,他引:1
激光雷达作为一种新型的大气观测工具,可以通过直接探测激光与大气相互作用的光辐射信号来定量地反演大气水平能见度,从而成为测量大气水平能见度的主要手段.正在研制的一台基于532nm波长的车载式米散射激光雷达,用于大气能见度的测量;简单介绍了正在研制的激光雷达的技术参数,给出了测量数据的处理方法;利用雷达的技术参数进行了模拟计算,显示了该激光雷达探测大气水平能见度的可靠性,计算误差显示在大气能见度为10km时该激光雷达的测量误差小于16%. 相似文献
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Multiple-slit streak tube imaging lidar is a promising flash imaging system. Its detectable range, affected by the detection
of the unit sensitivity, operating mode, and visibility, are critical factors for the system design and applications. In order
to discuss the lidar range measurement performance, a lidar equation based on the Lambert law is analyzed, and the relationship
between the lidar detectable range and the emission power is simulated at different levels of visibility; the result shows
that the detectable range of lidar developed in our laboratory reaches 2,500 m for a 23 km visibility. Outfield experiments
were carried out to evaluate the system performance; a clear stripe image for a target located 1386 m away was gained under
the condition of 15 km visibility. Finally, parameters that affect the lidar detectable range are discussed, and relevant
methods to improve the lidar performance are proposed. 相似文献
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R. Agishev B. Gross F. Moshary S. Ahmed A. Gilerson 《Applied physics. B, Lasers and optics》2005,80(6):765-776
We present a general methodology for evaluating the capabilities of a general lidar system encompassing both backscatter (elastic and Raman lidar) and topographic targets. By introducing a well-defined atmospheric reference medium and by individually examining and decomposing the contributions of lidar system parameters including lidar transmitter power, field of view, receiver noise, atmospheric conditions, and sky background on the signal-to-noise ratio, we obtain a simple dimensionless parameterization of the lidar system. Using this parameterization, numerical simulations are carried out to determine achievable lidar performance including operation range, minimum detectable gas concentration, and so on.This revised version was published online in August 2005 with a corrected cover date. 相似文献
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C. Mitrescu 《Journal of Quantitative Spectroscopy & Radiative Transfer》2005,94(2):201-224
Cirrus clouds play an important role in the climate through their optical and microphysical properties. The problem with measuring optical properties of these clouds can be partially addressed by using lidar systems. This paper presents a new model for describing the multiple scattering contribution to the backscatter signal measured by the lidar system. The new lidar equation introduced this way, expresses the backscatter signal in terms of a polynomial function of the cloud scattering coefficient. Cloud optical properties such as the extinction coefficient and lidar ratio can be deduced from the new proposed lidar equation. Moreover, some cloud microphysical properties can also be inferred from these optical properties. The method is applied to lidar data collected by the micropulsed lidar operating at Nauru under the auspices of the US Department of Energy ARM program. 相似文献
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Wei Gong Dale A. Richter Thomas H. Chyba Doyle A. Temple 《Optics & Laser Technology》2007,39(5):909-912
A lidar system employing a membrane mirror light shutter, MMLS, for dynamic range compression is demonstrated in this paper. The use of the MMLS allows the dynamic range of the lidar to be compressed by more than 2 orders of magnitude and, at the same time, the strong near-field optical return is avoided. Important parameters for an MMLS used in lidar are described and their measurements in a lidar configuration are presented. The decompression in the lidar data retrieval caused by using the MMLS is discussed. 相似文献
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The aerosol lidar ratio is a key parameter for the retrieval of aerosol optical properties from elastic lidar, which changes largely for aerosols with different chemical and physical properties. We proposed a method for retrieving the aerosol lidar ratio profile by combining simultaneous ground- and space-based elastic lidars. The method was tested by a simulated case and a real case at 532 nm wavelength. The results demonstrated that our method is robust and can obtain accurate lidar ratio and extinction coefficient profiles. Our method can be useful for determining the local and global lidar ratio and validating space-based lidar datasets. 相似文献
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Metal fluorescence lidar (light detection and ranging) has come of age as a tool for exploring the middle atmosphere. The Colorado State University sodium lidar system exemplifies these lidar systems, using a number of interesting techniques to achieve measurements of temperature and wind speed in the middle atmosphere. This and other fluorescence lidar systems have illuminated a number of interesting properties of the mesopause region (within the middle atmosphere). This paper reviews both the laboratory physics necessary to construct fluorescence lidar systems, and the advances in atmospheric science that have resulted from the data collected. 相似文献