共查询到18条相似文献，搜索用时 156 毫秒
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在 0 1时单独测风时 ,有时需要采用单经纬仪测风观测。但在现行的《5 9- 70 1微机数据处理系统探测手册》中 ,没有微机程序处理单经纬仪测风记录的说明。台站工作人员在遇到单经纬仪测风时 ,按照雷达单测风处理的办法 ,假设在使用雷达观测时遇到前几分钟缺测 ,在留出足够的空间后 ,随便输入几分钟的雷达测风数据 ,后边采用补放经纬仪小球的方法处理。然后在高表 - 1 6中 ,根据规定等压面的平均高度内插风向风速 ,手工修改相应报文及测风方法指示码。这种办法极不方便 ,需要人工修改的地方很多 ,容易延误时间或出现错情。在实际工作中 ,经过… 相似文献
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在伟大的无产阶级文化大革命运动的推动下,我国自行设计、生产的光学测风经纬仪已陆续在各高空测风台站使用。由于仪器经常处于室外,不可避免地受到日晒、风沙和水汽的侵袭。因此,要保证仪器良好,提高观测高度,延长其使用年限,除了观测员正确细心的使用外,经常对仪器进行检查、维护,是十分重要的。现将我们在这方面的一些体会介绍如下: 相似文献
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在一些气象研究课题和业务工作中,边界层内风场的详尽资料是不可缺少的,获取这项资料的基本手段是进行双经纬仪基线测风。我们在进行有关空气污染的气象观测中,为取得大气边界层内风的资料而经常使用双经纬仪测风法。 过去进行双经纬仪测风的一大麻烦是数据处理问题,数据处理的步骤是:选择适当的投影面,由经纬仪读数和基线长度算出各时刻的气球高度,用测风绘图板求得量得风层风向风速,最后内插得规定层风向风速。这种手算方法一是工作量大,二是计算过程繁杂,容易出错,三是计算精度差,只能分辨到1米/秒。国外在六十年代就已开始用计算机处理双经纬仪测风资料,国内在近几年的大规模试验工作中也采用了电子计算机处理资料。随着环境问题的重要性日益突出,很多部门和省市进行了双经纬仪测风,我们在这里介绍一种适用于电子计算机的双经纬仪数据计算方案。这种方案在国外已被广泛使用并得到较好评价, 相似文献
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对ＥＮ型测风数据处理仪使用的几点建议１９９３年１０月，ＥＮ型测风数据处理仪先后在我省十个地市气象局所属台站投入业务使用。经我们对ＥＮ型测风数据处理仪使用情况的调查，台站反映该仪器功能多，性能强，精度高，易操作，既提高了观测质量，又减轻了观测员的劳动强... 相似文献
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对流层下层各高度的风向风速资料可以通过施放小球并用经纬仪跟踪其运动获得。双经纬仪测风,由于计算量大,不用计算机是难以实现的。常用的计算方法有投影法和矢量法,比较二者,矢量法优于投影法。我们用矢量法在PC-1500袖珍机上编制了双经纬仪小球测风计算程序。它具有输出原始资料,监视观测误差和输出不同高度的风向、风速值等功能。实际应用,效果较好。 相似文献
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有时当701雷达发射机开启高压后,接收机的灵敏度立即大幅度下跌,待工作15分钟左右后,四条测角亮线便无法对齐了。这时若把发射机高压切断,测角信号又恢复正常,并一直到球炸都无异常现象。发生这种故障的台站,就常常把701雷达当无线电经纬仪使用,影响了高空风的质量与时效。 在排除这种故障的过程中,我们曾经判断是由于 相似文献
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我国气象台站用701雷达探测高空风,常用的方法主要是“雷达测风法”(简称雷达法)。但在斜距资料缺测时,往往改用探空高度代替斜距计算高空风,即改用“经纬仪测风法”(简称经纬仪法)。这种观测方法的改变,若使用不当,将会使测得的高空风速误差急剧增大。因此,不能盲目地将701雷达当无线电经纬仪使用来测定高空风。 相似文献
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目前我国的高空气象探测系统是由测风雷达和气球携带的探空仪两部分组成。测风雷达测定气球的空间位置，探空仪提供大气的温度、气压和湿度数据。全国120多个高空站中，除少数台站使用“GTS数字探空仪—GFE型L波段二次测风雷达”和“TK-2电子探空仪—707型C波段一次测风雷达”外， 相似文献
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An economical tethersonde system has been developed for use in the light-to-moderate wind conditions typically accompanying nocturnal inversions, to obtain vertical profiles of wind velocity and temperature to heights in excess of 300 m. Minimal capital investment and operational expenditure were achieved with the utilization of a spherical balloon, the development of a simple and reliable thermistor temperature sensor, and the development of algorithms to obtain quantitative estimates of wind velocity from the measured position of the balloon and from the known aerodynamic drag properties of both the balloon and the tether. With the length and suspension geometry of the tether line known, an approximation is applied to allow for its non-linearity, and the position vector of the balloon and instrument package can then be determined by a single theodolite fix. The vertical component of the position vector so determined corresponds to the geometric height of the sensor, while the horizontal component is directly related to wind velocity. Heights and horizontal wind velocities estimated by these methods compare well with direct independent measurements. 相似文献
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The local sea-breeze circulation in Venice is found to have typical characteristics but the nocturnal flow is found to be
quite complex. This latter results is due to unequal cooling of the Alps and adjacent low-lying regions. The horizontal and
vertical structure of the flow has been investigated using data obtained from surface anemometers and pilot balloon observations.
Results show that the circulation is about 500 m in depth and achieves a maximum speed of 6 m s−1. 相似文献
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The local sea-breeze circulation in Venice is found to have typical characteristics but the nocturnal flow is found to be quite complex. This latter result is due to unequal cooling of the Alps and adjacent low-lying regions. The horizontal and vertical structure of the flow has been investigated using data obtained from surface anemometers and pilot balloon observations. Results show that the circulation is about 500 m in depth and achieves a maximum speed of 6 m s–1 相似文献
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Local variations in the summertime mixing height over metropolitan St. Louis, Missouri, are examined in order to evaluate the dynamical and thermodynamical influences of an urban area. Case studies employing aircraft, lidar, pilot balloon and radiosonde data from Project METROMEX show variations in the height of a temperature inversion which caps a deep mixing layer. A dome-like lifting of the inversion structure occurs over the urban-industrial center with subsidence of the inversion layer at the perimeter of the metropolitan area. The maximum amplitude of the dome occurs shortly after mid-day, suggesting that thermal influences are primarily responsible. 相似文献
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Detailed analysis is made of anisotropy of slope scattered radiation (SSR) in terms of the data obtained by a pyranometer mounted on a theodolite,indicating the change of SSR as a function of orientation and slope.And also reviewed are the models for SSR calculation developed by earlier researchers through the tests with the data.On this basis a new model for SSR flux density is proposed which is of higher applicability and has advantage over the analogues abroad both in physical implication and accuracy of the calculations. 相似文献
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(一)测量云高之方法: 测量云之高度,必须於申乙两处,同时以经纬仪量云所在之方位,及其仰角。甲乙两处相距约须有千五百公尺之遥;两处并须有电话相通,俾观测者得约定时间及指定欲测之云块。两处同时测定之後,则云之高度即可求得。此法发明甚早,十七世纪意大利教士 Ricciol 相似文献