NLSA Nova 是实时准确跟踪计算卫星位置的软件, 可以以三维地图形式显示卫星位置与运行轨道, 你也可以用它计算太阳月亮行星等天文观察参数, 这些参数的获得有益你调整卫星天线改善通讯等无线电信号的接收与发送.[img]http://www.nlsa.com/images/pictures/ortho.gif [/img]Fast, accurate real-time tracking information for an unlimited number of of Earth-orbiting satellites. Full-color 3-D maps. See Nova for Windows‘ image gallery. Built-in autotracking for turning az/el antennas. Control antennas with the computer joystick Super-simple updates of Keplerian Elements... AMSAT or NASA 2-line format. One-click updating of Keplerian elements via the internet (HTTP & FTP). Can be completely automated for regularly scheduled updates. Automatic time setting via the internet Easy-to-use frequency display. Capture maps and save them to disk, or e-mail to someone else Automatic sound alarms for satellite AOS, TCA, and LOS. Information-rich graphics + text satellite tracking screens. Also tracks the Moon, Sun, planets, cosmic noise sources, and cold sky. Displays the star background, too Context-sensitive online Help available at all times. You can preview the entire Help file if you want to. Exceptional speed and accuracy using James Miller‘s Plan-13 or T.S. Kelso‘s adaptation of SGP4/SDP4 tracking algorithms. Full implementation of Escobal‘s fast rise-set algorithm for nearly-instant AOS/LOS calculations. Complete listing capability for printed output of future passes, mutual windows, two-satellite mutual visibility, satellite eclipses. Sophisticated fully-editable or automatic "Script Tracking" for scheduling future passes of multiple satellites. Nova for Windows can priority-autotrack dozens of satellites.