雷达

These categories are sky wave and surface wave radar systems.

这两种类型分别为天波雷达系统和地波雷达系统。

Polarization filtering technique is widely used in many fields, for example interference suppression of sky wave in HF radar. Based on the actual wave data of both signal and clutter, the cause for generation of error, way of error reduction and improvement of SIR by using polarization filtering technique are discussed.

极化滤波技术在高频雷达抗天波干扰等领域有着广泛的应用，结合实际雷达测得的目标回波和干扰回波矢量数据，对极化滤波误差产生的原因、减小误差的方法以及利用极化滤波方法提高信干比的有效性进行了详细分析。

By sky or ground wave propagation, the detection range of the HF radars breaks through the limit of the curvature of the earth, which makes it possible for long-range air early-warning and target monitoring. At the same time the unique abilities in detecting low-detectable targets of the HF radars makes them powerful equipments for detection of hermit aircrafts, small airplanes in heavy land and sea clutters, and even intercontinental missiles.

借助于天波或地波传播方式，高频雷达的探测范围突破了地球曲率的限制，因此使远距离空中预警和目标监测成为可能，同时高频雷达所具有的独特和良好的对低可探测性目标的探测能力，使之成为探测隐形飞行器和处于强地杂波和海杂波背景中的小型军用飞机、巡航导弹等贴地、贴海飞行的小目标及洲际导弹进行有效探测的有力装备。

Hadow will pull a sled fitted with a specially-designed radar, which will take readings of the depths of snow, ice and sea every 10cm.

哈道将拖着一架装有专门设计雷达的雪橇，这种雷达可测出雪、冰和海平面的深度，误差10厘米。

In the method, the orbit of targets and the radar coordinates and parameters are put to calculate attitude and dynamic parameters of targets in line of sight. And then the dynamic data are generated according to the electromagnetic modulation model of the movement of targets including motion at high speed, spin, precession on electromagnetic wave.

该方法首先确定目标的轨道和雷达的布站坐标及工作模式，而后计算目标在雷达观测视线(line of sight， LOS)方向上的姿态和运动参数，最后根据空间目标高速运动、自旋、进动等在电磁波上调制的数学模型生成动态测量数据。

Back car radar system: according to the speed and the exercise of state, the system activates or deactivates reversing radar systems, and reduces staff ride reversing a result of the visual limitations the inconvenience caused.

倒车雷达系统：根据车速和行使状态，启动或关闭倒车雷达系统，减少乘驾人员倒车时因视觉限制而引起的不便。

Under the terms of the initial ＄42 million contract with the Command's Robotics and Unmanned Systems Program Management Office, Northrop Grumman will deliver 10 STARLite Synthetic Aperture Radar/Ground Moving Target Indication radars to the Army.

根据与该司令部机器人技术与无人系统项目管理办公室的4200万美元初始合同，诺斯罗普·格鲁曼公司将向美国陆军交付10部STARLite合成孔径雷达/陆地移动目标指示雷达。

We briefly introduced ice radar and its technical development firstly and then mainly reviewed the progress of ice radar in investigating and researching Antarctic ice sheet thickness and subglacial topography, internal reflecting horizons, subglacial lakes and water systems, subglacial bedrock roughness and crystal orientation fabrics.

首先，简要介绍了冰雷达及其技术发展，然后着重评述了冰雷达在探测研究南极冰盖厚度和冰下地形、内部反射层、冰下湖和冰下水系、冰床粗糙度以及冰晶组构上的进展。

According to this algorithm, the target motion in three-dimensional space is described by a nonlinear state equation, including tangential and normal accelerations.

在分析雷达对远距离机动目标跟踪速度精度要求和存在困难的基础上，提出了一种提高三坐标雷达速度估计精度的滤波算法。

Researches in this paper are based on a ship target recognition systems for sea surveillance radar.

本文以某型岸基对海警戒雷达目标识别系统的研制和开发为背景，针对雷达目标识别的具体情况，开发了利用贪心算法的特征选择软件模块，保证了特征选择的有效性。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。