The windshear strength as detected by the lidar was in good agreement with a report of windshear by an aircraft landing on the northern runway at that time 激光雷达观测得到的风切变强度与当时在此跑道陆的航机所报告的风切变情况吻合。
The radar data show details at the northern end of the dark feature similar to those seen in earlier radar observations of much smaller , liquid - filled lakes 雷达数据在阴暗结构的北端展示出的细节同稍早雷达观测到的小得多的液体湖类似。
Radar observations using earth - based radio telescopes have pierced those clouds and suggest the presence of lakes composed of liquid hydrocarbons 利用地球表面无线电波望远镜所做的雷达观测，可穿透这些霾雾，看见可能是由液态碳氢化合物组成的湖泊。
The satellites happened to orbit over the region between two and nine hours after the earthquake , making the first radar measurements of a tsunami propagating across the open ocean 在地震发生后2 ~ 9小时间，这组卫星正绕著轨道运行到此区域的上方，并做出海啸横越开放海域的第一套雷达观测。
The main issue of this paper is how to make use of the observation of doppler radar to mesoscale numerical forecasting , using doppler radar data to improve on the initial field of numerical model , and then examine the results 本文要探索的主要问题是如何把多普勒天气雷达观测资料用于中尺度数值预报，用多普勒雷达观测资料改进数值模式的初始场，看其效果。
Ovary development stage of females in catches and radar observation indicated that l . sticticalis migrated to northeast in early june , to southwest in august and september , and locally - bred moths dispersed over shorter distances in july and august 卵巢发育进度法和雷达观测表明草地螟在6月初向东北迁飞，在8月和9月向西南迁飞，当地繁殖的蛾子在7 、 8月份进行短距离扩散。
The state estimation algorithms are the basis of information fusion . the typical single - mode tracking algorithms are dedicated . according to the mechanism of active and passive radar observation , a preprocessing method for observation data is dedicated 状态估计是信息融合的基础,论文第二章首先分析了弹载平台下,主被动雷达观测数据形成机理和特点,对观测预处理问题进行了研究,并根据弹载平台数据特点,研究了几种常用跟踪方法。
Mesoscale model simulations have been performed of a severe thunderstorm that occurred on 22 - 23 august 2001 in huabei area in china . combing with satellite , doppler radar images and general weather observations , the evolution mechanism of the severe thunderstorm is analysed with emphasis on the orographic effect of taihang mountain 将模拟的云、风、压场和降水与实况资料进行对比检验，在控制模拟效果较为理想的情况下，结合卫星、 doppler雷达观测和常规天气资料，对整个对流风暴的发展演变过程进行分析，并着重对强对流风暴发生演变的热力、动力机制以及重力波特征进行了研究。
The paper makes use of doppler radar data to mesoscale numerical model , through adjusting divergence fie ld , vertic al velo city fie id etc . to improve on initial field . the investigation results show that there is a improvement in the forecasting effects , precipitation position is closer to practicality 试验结果表明，在中尺度数值模式中利用多普勒雷达观测资料，对初始场进行修正，通过散度和垂直速度场等的调整，有效提高预报效果，使得雨区范围和雨量更接近实况。
An on - line minimum - variance estimator was developed for thrust acceleration applied to orbit transfer using discrete - time radar measurements . the mass - flow - rate of propellant was selected as a state variant , which was estimated by employing an integral state model and ekf filter . the variation equations for measurement vector to mass - flow - rate have been established to linearize the discrete - time measurement equations . the algorithm has applied successfully to maneuver process in commanding satellite into geo - stationary orbit . the results show that the algorithm developed here can monitor and determine whether engine works well or failure precisely and quickly during orbit transfer process 飞行器轨道机动过程中,为跟踪、定位机动目标和干预机动控制过程,需要统计处理离散的雷达观测量实时估计推进发动机的推力,进而确定飞行器的瞬时轨道参数.本文所述算法是该工程问题的探讨和解决方案.文章建立了轨道机动过程中连续变质量运动模型和离散雷达量测模型,推进发动机的质量秒耗量作为表征推力加速度的一个近似常量,应用扩展卡尔曼滤波对离散的雷达测量数据进行顺序统计处理给出秒耗量的最小方差估计;文章详细地推导了线性化量测模型的变分方程和观测矩阵;仿真结果表明该算法能快速、准确地估计推进发动机的质量秒耗量和向机动目标施加的实际推力
