Spirit Sends Back Postcards from Mars
NASA’’s Mars Exploration Spirit is sending back its first images from the surface of Mars. More images will be available shortly. NASA’’s Deep Space Network received a signal confirming that Mars Exploration Rover Spirit is alive after rolling to a stop on the surface of Mars(Updated - Jan 4. 12 am PST) 作者: suncon 时间: 2004-1-5 02:39 标题: “勇气号”登陆火星后传回第一组照片
Spirit Rover Lands on Mars
Jubilant Mars Exploration Rover Team members cheer at Jet Propulsion Laboratory as they get the first tones from a healthy Spirit on Mars! Check back to this page for more rover updates 作者: suncon 时间: 2004-1-5 02:42 标题: “勇气号”登陆火星后传回第一组照片 Around 6:45 pm PST, the mission team will be preparing the spacecraft for communications during entry, descent, and landing. Spirit’’s cruise stage switches from its medium-gain antenna (which requires pointing toward Earth), to its low-gain antenna, which does not need to be pointed as precisely for the Deep Space Network antennas to pick up the signal. This switch slows the rate of data transmission, but is necessary to allow communications to continue when the spacecraft changes its orientation to point its heat shield forward. 作者: suncon 时间: 2004-1-5 02:44 标题: “勇气号”登陆火星后传回第一组照片 About a quarter after 8 pm PST, Spirit will begin transmitting tones back to Earth that indicate the spacecraft’’s status. A low-gain antenna on the spacecraft’’s backshell begins transmitting simple tones (sustained radio frequencies coded to report the spacecraft’’s status). These tones give Spirit a way to keep communicating after the cruise stage is jettisoned. A dictionary of about 100 possible tones can provide information such as whether the cruise stage has separated, whether the parachute opens, and whether the deceleration rate is within the expected range. 作者: suncon 时间: 2004-1-5 09:58 标题: “勇气号”登陆火星后传回第一组照片 作者: suncon 时间: 2004-1-5 10:00 标题: “勇气号”登陆火星后传回第一组照片
