–The topic of radio interference with GPS came up at the Munich Navigation Satellite Summit, and is a concern everywhere; it’s just the LightSquared fiasco that has highlighted it in the US. I couldn’t understand why the FCC was so hellbent on fast-tracking the LightSquared proposal, ...
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The acceleration of the satellite could also be computed independently as a correction, depending on purpose, but normally the effect is already dealt with in the first two corrections.[140][141] 参考译文:由于相对论效应,GPS对其时间信号进行了两大校正:一是利用狭义相对论对卫星和接收机的相对速度...
As a GPS device moves, the radius (distance to the satellite) changes. When the radius changes, new spheres are produced, giving us a new position. We can use that data, combined with the time from the satellite, to determine velocity, calculate the distance to our destination and the ETA...
indata,GIS,Google Earth,Google Maps,GPS,KML,MapWindow,shapefile,spreadsheetandWeb apps.5Comments Got an email today from someone with a data collection/coordination/assembly problem. They have multiple people out in the field with Garmin GPS units recording data, and bringing it back to a centra...
At first glance, this might seem counterintuitive. The explosion would be pretty indiscriminate. After all, the U.S. isn't the only country with satellite navigation systems in space. 乍一看,这似乎违反直觉。爆炸将非常不分青红皂白。毕竟,美国不是唯一拥有太空卫星导航系统的国家。
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原理上,GPS按五个步骤工作: 步骤一:对卫星的三角测量 你未必可能闲心,GPS利用天空卫星定位方法与通常我们在地面的定位方法一样。那是一个伟大的几何学思想,通过测量我们距三颗卫星的距离,我们能知道在地球上任何一定的精确三维坐标。 假设我们测得距离我们11000里远的一颗卫星。那么我们就可以把宇宙中所有可能定位的...
Car satellite navigation systems use GPS. (Image credit: Getty) These days, many people take Global Positioning System devices for granted. Most people are familiar with the concept of using a GPS system (either as a stand-alone device or in a phone) to find one's way around. GPS can ...