File:Pia17952 electra transceiver dsc09326 0.jpg
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摘要
描述Pia17952 electra transceiver dsc09326 0.jpg |
English: Electra Relay Radio on MAVEN Mission to Mars
NASA's Mars-bound MAVEN spacecraft (for Mars Atmosphere and Volatile Evolution) carries this relay radio transmitter and receiver to be used for UHF (ultra-high frequency) communication with robots on the surface of Mars. It is MAVEN's Electra UHF Transceiver, which passed an in-flight checkout on the spacecraft on Feb. 19, 2014. Orbiter relay of data from Mars rovers and stationary landers provides return of much more information to Earth than would be possible using only the capability for transmitting data directly from the Mars surface to Earth. NASA's Mars Odyssey orbiter and Mars Reconnaissance Orbiter have provided relay support for the rovers Spirit, Opportunity and Curiosity and for the Phoenix lander. Electra radios, already in use on Mars Reconnaissance Orbiter and Curiosity, are software-defined, enabling them to autonomously adjust their data rate to suit variations in signal strength due to angles and transmission distance as the orbiter crosses the sky over the rover. This transceiver, the flight model for MAVEN, is about 8.6 inches (22 centimeters) long and 5 inches (13 centimeters) tall. NASA's Jet Propulsion Laboratory, Pasadena, Calif., provided and operates it. MAVEN will be available to provide relay support on a contingency basis during its prime mission and may routinely provide relay support during an extended mission. MAVEN will examine the upper atmosphere of Mars to provide an understanding about processes that led to the loss of much of the original Martian atmosphere. Data and analysis could tell planetary scientists the history of climate change on the Red Planet and provide further information on the history of planetary habitability. The spacecraft was launched on Nov. 18, 2013, and will enter orbit around Mars in September 2014. NASA Goddard Space Flight Center in Greenbelt, Md., manages the MAVEN project for NASA's Science Mission Directorate, Washington, and built some of the science instruments for the mission. MAVEN's principal investigator is based at the University of Colorado's Laboratory for Atmospheric and Space Physics in Boulder. The university provided science instruments and leads science operations, as well as education and public outreach, for the mission. Lockheed Martin Space Systems, Denver, built and operates the spacecraft. The University of California at Berkeley's Space Sciences Laboratory provided instruments for the mission. JPL, a division of the California Institute of Technology in Pasadena, provides navigation support and Deep Space Network support, in addition to the Electra hardware and operations. |
来源 | https://www.nasa.gov/jpl/maven/electra-relay-radio-pia17952/#.WAusYhKeZ_4 ; http://www.nasa.gov/jpl/maven/mars-20140227 |
作者 | NASA/JPL-Caltech |
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许可协议
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本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ![]() |
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原始上传日志
日期/时间 | 大小 | 用户 | 备注 |
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2016-10-22 18:20:03 | 2816 × 1872 | Fotaun | {{PD-NASA}} https://www.nasa.gov/jpl/maven/electra-relay-radio-pia17952/#.WAusYhKeZ_4 Electra Relay Radio on MAVEN Mission to Mars NASA's Mars-bound MAVEN spacecraft (for Mars Atmosphere and Volatile Evolution) carries this relay radio transmitter a... |
说明
此文件中描述的项目
描绘内容
image/jpeg
ISO速度 简体中文(已转写)
320
曝光时间 简体中文(已转写)
0.033333333333333 秒钟
焦距比数 简体中文(已转写)
2.8
焦距 简体中文(已转写)
6 毫米
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当前 | 2018年4月30日 (一) 18:55 | ![]() | 2,816 × 1,872(4.58 MB) | Pline | Transferred from en.wikipedia (MTC!) (1.1.0) |
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相机制造商 | SONY |
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相机型号 | DSC-H2 |
曝光时间 | 1/30秒(0.033333333333333) |
光圈值 | f/2.8 |
感光度(ISO) | 320 |
数据生成日期时间 | 2012年1月12日 (四) 13:56 |
镜头焦距 | 6毫米 |
方向 | 正常 |
水平分辨率 | 72 dpi |
垂直分辨率 | 72 dpi |
文件修改日期时间 | 2012年1月12日 (四) 13:56 |
亮度(Y)和色度(C)位置 | 重叠 |
曝光程序 | 普通程序 |
Exif版本 | 2.21 |
数字化日期时间 | 2012年1月12日 (四) 13:56 |
每个色彩组分意义 |
|
图像压缩模式 | 8 |
APEX曝光补偿 | 0 |
最大光圈 | 3 APEX(f/2.83) |
测光模式 | 多区 |
光源 | 未知 |
闪光灯 | 闪光灯未点亮、闪光灯强制关闭 |
支持的Flashpix版本 | 1 |
色彩空间 | sRGB |
文件来源 | 数码相机 |
场景类型 | 直接拍摄的图像 |
自订图像处理 | 普通处理 |
曝光模式 | 自动曝光 |
白平衡 | 自动白平衡 |
场景拍摄类型 | 标准 |
对比度 | 标准 |
饱和度 | 标准 |
锐度 | 标准 |