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radar是什么的缩写1.RADAR RAdio Direction And Ranging,无线电定向和测距(技术，方法)，雷达(台，设备，探测术)，无线电探测(器)，无线电定位(装置) 阅286 转0 评0 公众公开 11-01-16 18:54 |
阅35 转0 评0 公众公开 11-01-16 18:28 |
射电源_互动百科射电源宇宙射电源的简称，即宇宙空间发出射电的分立射电源。第一种是正常射电星系，像仙女星系这样的所有邻近旋涡星系，在射电波段它们的辐射同银河系类似。有些射电源的射电来自一个单一小区，少数射电源具有明亮的中心源，周围有较大的延伸射电区,后者称为核-晕射电源。特殊射电星系大多数是具有射电双源的椭圆星系，其射电来... 阅272 转1 评0 公众公开 11-01-15 20:38 |
射电星_互动百科射电星 - 正文 有连续谱射电的恒星或恒星状天体。七十年代对射电星开始了系统而深入的观测研究，由于目前射电望远镜的灵敏度还不足以测到一般恒星的射电，测到的射电星大部分都有特殊性质的射电爆发，其射电变化的时间尺度由几分钟、几小时、几日乃至几年不等。可以把已探测到的射电星分为鲸鱼座UV型变星（见耀星）、红超巨... 阅160 转0 评0 公众公开 11-01-15 20:35 |
我们把地球大气在垂直方向上分成五个层次，即对流层、平流层、中间层、暖层（电离层）和逃逸层。在高纬度对流层顶（8公里），温度降低到-53℃；根据温度、湿度以及气流的运动特点，对流层又可以分为三层，即对流上层、对流中层和对流下层。对流下层是整个大气层与地球表面邻接的边界区域，因此又被称为大气边界层，或者行星边界层。由于温度梯... 阅2476 转14 评0 公众公开 11-01-15 18:02 |
Medium Earth orbit(MEO)Medium Earth orbit(MEO)From Wikipedia, the free encyclopedia (Redirected from MEO)Jump to: navigation, search "MEO" redirects here.(February 2009) Various earth orbits to scale;Yellow represents medium earth orbitTo-scale diagram of low, medium and high earth orbits.The orbit has a m... 阅111 转0 评0 公众公开 11-01-11 21:20 |
Geostationary orbit - Wikipedia, the free enc...Satellites in geostationary orbits are far enough away from Earth that communication latency becomes very high — about a quarter of a second for a one-way trip from a ground based transmitter to a geostationary satellite and then on to a ground based receiver, and close... 阅136 转0 评0 公众公开 11-01-11 21:13 |
Highly elliptical orbit - Wikipedia, the free...Bodies moving through the long apogee dwell can appear still in the sky to the ground when the orbit is at the right inclination, where the angular velocity of the orbit in the equatorial plane closely matches the rotation of the surface beneath. 阅84 转0 评0 公众公开 11-01-11 21:10 |
High Earth orbit - Wikipedia, the free encycl...Name NSSDC ID Launch Date Perigee Apogee Period Inclination Eccentricity Highly Elliptical Orbit.1965-030A.1965-04-23538 km.39,300 km.708.0 min.65.0.1963-039A.1963-10-17101,925 km.116,528 km.6,519.6 min.37.8. 阅107 转0 评0 公众公开 11-01-11 21:09 |
Recently it has become possible to connect the VLBI radio telescopes in real-time, while still employing the local time references of the VLBI technique, in a technique known as e-VLBI.[citation needed][edit] How VLBI WorksRecording data at each of the telescopes in a VLBI array.Any brightness distribution can be writ... 阅235 转1 评0 公众公开 11-01-10 11:23 |
