共查询到17条相似文献,搜索用时 185 毫秒
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介绍了低空风切变识别的研究情况,提出了一种基于激光测风雷达的机场低空风切变识别算法,针对性设计了重点监测区域和告警方式;并于2016年春季和2018年春夏季,在气候、地形复杂度不同的多个机场进行低空风切变监测试验,通过分别与国外某型激光测风雷达以及同时段航空器报告结果做对比,评估本文算法的切变识别能力。试验结果表明,本文算法可以有效监测到激光测风雷达探测范围内的低空风切变,命中率可达88%以上。 相似文献
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为了对激光测风雷达在民用机场的运行环境适应性及综合保障能力进行评估,采用国产自研激光测风雷达在典型高原机场为期3个月的风场联合监测试验数据,结合同址相关气象资料,分晴、多云、阴、雾及降水等不同气象条件,对激光测风雷达的风场数据进行了分析,以揭示典型高原机场的风场特征,检验国产激光测风雷达的综合保障能力。结果表明,在不同天气类型下,激光雷达的测风性能存在明显的差异,其在晴、多云、阴天整体表现较优,水平最大探测距离最远可达6623m,垂直最高可达2895m;同时,激光测风雷达能精准捕捉到高原机场的风场在时间尺度和空间尺度上的典型变化特征。该研究为雷达在民航的应用提供了参考。 相似文献
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基于短距相干测风激光雷达的机场低空风切变观测 总被引:2,自引:1,他引:1
介绍了低空风切变及其预警的研究工作、相干多普勒测风激光雷达反演风场算法以及计算下滑道逆风廓线算法.进一步分析了2015年冬季和2016年春季北京首都机场低空风切变观测实验中所观测到的风切变案例,利用多种测量模式开展案例中风切变的监测,并对风切变观测结果进行了验证.实验结果表明,短距相干多普勒测风激光雷达多种测量模式均可能有效探测低空风切变. 相似文献
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激光雷达在机场低空风切变探测中的应用 总被引:1,自引:0,他引:1
简述了低空风切变及传统探测手段的局限,结合我国香港国际机场的最新研究进展,对多普勒激光雷达的测风原理、低空风切变探测中的自动识别算法及预警系统进行了综述,最后介绍了风切变探测目前存在的问题及最新发展:高性能、人眼安全激光等激光雷达新技术以及数据产品的开发利用是未来研究的重点。 相似文献
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为了精确测量3维大气风场的实时状态以应对低空风切变在飞行器起降过程中给飞行器带来的多种问题,通过DBS四波束风场反演原理研制出一款小型3维激光测风雷达。对大气风场展开测风试验并获取风场数据,并与其它标准测风设备的数据对比分析。结果表明,雷达在晴天和阴天的天气状况下均可以实现对大气风场的有效测量,风速均方根误差0.42m/s,风向均方根误差5.33°。该雷达精准度高、稳定性好,对风切变预警、中低空大气风场预报及飞行器飞行通道的风场测量具有重要作用。 相似文献
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低空风切变极易对起降过程中的飞行器、风力发电机的结构产生破坏性影响。简要介绍了低空风切变及风切变的危害,详细介绍了相干多普勒激光雷达的工作原理和低空风廓线反演算法,以及利用风廓线、风矢量图、风速梯度图等观测数据提取风切变的方法。分析了2015年春季北京首都机场低空风切变个例发生的气象条件和风切变强度。实验结果表明相干多普勒测风激光雷达能有效探测分析低空风切变。 相似文献
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较强的低空风切变会引发超低空复飞,对飞机安全威胁较大。为了提高飞行安全保障能力,利用激光测风雷达和风廓线雷达提供的资料,对2018-04-26西宁机场突发的一次风切变进行了细致结构分析和形成机理研究。结果表明, 微下击暴流是造成此次低空风切变的主要原因,雷暴高压向外辐散气流和环境风同向叠加是低空风切变形成的直接原因; 干冷空气在2.0km高度处加速下沉,到达近地面形成雷暴高压,随后外流形成水平尺度约3.0km的辐散气流,而触发低空风切变; 此次低空风切变影响时间约8min,对飞行安全威胁最大是下击暴流产生初期; 0.4km~2.0km高度处上升气流迅速转为下沉气流的时刻,较低空风切变发生有约4min的提前量。该研究对如何利用测风雷达进一步提高飞行安全保障能力是有意义的。 相似文献
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McCarthy J. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1989,77(11):1728-1734
It is affirmed that there is a critical need for the development of aviation weather warning and forecast system products that give attention to storm-scale weather. This specifically addresses weather events that occur on the 0-2 h time and 0.5 mile space scales, which are significantly smaller than the scales used in current weather systems. Through a series of weather sensor modernization systems, including Doppler weather radar vertical wind profiling radars, automated surface weather-sensing stations, and advanced weather satellites, the capability to obtain high-resolution advanced weather products will be enhanced. Examples both of deficiencies in the current aviation weather system and of expected advanced products in a modernized weather system are given. For example, a precise 30-60 min thunderstorm point forecast should become available during the next decade. In addition, a series of fully automatic weather hazard warning products, including those for low-altitude wind shear, tornadoes, and turbulence, will become available for air traffic controllers and flight crews. It is noted that, once validated advanced weather products are routinely made available, it is incumbent upon the operational users of the aviation system to develop more definitive means of making operational decisions that improve the safety and efficiency of the system 相似文献
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高保真的低空风切变数据是进行低空风切变检测和飞行性能分析的必要基础。为解决低空风切变危险性高、发生突然且持续时间短等带来的真实数据不易获取的难题,本文提出了一种利用函数拟合的低空风切变三维建模方法。该方法依据风切变的流体力学特征,通过函数拟合的方式建立风场类型及特征可变的三维密度场和速度场,并按照现有机载气象雷达在风切变探测模式下的天线扫描与工作方式,实现低空风切变雷达回波仿真。仿真结果表明:该方法可灵活快速地实现低空风切变三维风场建模,雷达回波的速度估计结果较好地反映了低空风切变径向速度沿距离方向呈现反“S”型特征的分布特点。 相似文献
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Mahapatra P.R. Zrnic D.S. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1991,79(9):1234-1267
The authors describe the physics of adverse weather, the basics of Doppler engineering, and a host of advanced sensing systems-some with the ability to autonomously identify and track storm conditions-for all stages of airplane travel. Three major new Doppler radar systems are discussed: the next generation weather radar, the terminal Doppler weather radar, and the airport surveillance radar with a dedicated weather channel. Other relatively simple new instruments for aviation weather support include the low level wind shear alert system, the Doppler wind profilers, the automated weather observation system, and the automated surface observation system. These systems are designed to perform higher level functions such as detection, characterization, and hazard potential estimation of aviation-significant weather phenomena, as well as their communication and display automatically 相似文献
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This is a review of clear-air radar with special emphasis on applications. The history of radio scattering from turbulence-induced refractive-index fluctuations is discussed along with current research programs using clear-air radars. Applications involving wind measurement are presently being implemented and the first operational use of clear-air radar will be to improve weather prediction. Eventually, the same clear-air radar system used to observe the weather will be used for optimum routing of aircraft for fuel economy and to estimate transport of pollutants in acid rain studies. Clear-air radar also can potentially be used as an airport hazard monitor for wind shear and wingtip vortices. A new application for clear-air radar is monitoring the presence and height of refractive layers aloft to predict anomalous propagation and estimate unusual radar coverage. Because insects are often detected by clear-air radars, we have included insects as clear-air targets and discuss the use of radar to study insects and birds. 相似文献