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Satellite constellations harvest energy for near-total global coverage（图）
Satelliteconstellations harvest energy global coverage
2020/1/19
Think of it as a celestial parlor game: What is the minimum number of satellites needed to see every point on Earth? And how might those satellites stay in orbit and maintain 24/7 coverage while conte...
A New Method for Coverage Prediction for the Wide Area Augmentation System (WAAS)
Coverage Prediction Wide Area Augmentation System (WAAS)
2015/6/29
To provide a detailed analysis framework for WAAS accuracy prediction, a new method has been developed which combines GPS geometry simulation with least squares covariance analysis. This approach cons...
Flight Trials of a Geostationary Satellite Based Augmentation System at High Latitudes and for Dual Satellite Coverage
Flight Trials Geostationary Satellite Based Augmentation System High Latitudes Dual Satellite Coverage
2015/6/29
Several flight demonstrations have taken place over the past few years to show how the Wide-Area Augmentation System (WAAS), currently under development for the Federal Aviation Administration, will i...
Improving GPS Coverage and Continuity:Indoors and Downtown
Improving GPS Coverage Continuity:Indoors Downtown
2015/6/26
These days, GPS use is being extended into areas where hitherto it simply was not available. For years, it has served society remarkably well for survey, aviation use, maritime use and a host of other...
The Loran coverage availability simulation tool (LCAST) was initially created for the 2004 Federal Aviation Administration (FAA) Loran technical evaluation report. The tool incorporated the then curre...
NASA Sets Briefing, TV Coverage of Japan's First Cargo Spacecraft
NASA Japan's First Cargo Spacecraft TV
2009/8/31
NASA will hold a news briefing at 12:30 p.m. CDT on Wednesday, Sept. 2, to preview the maiden launch and flight of Japan's unpiloted H-II Transfer Vehicle (HTV) cargo spacecraft to the International S...
NASA's Lunar Reconnaissance Orbiter, or LRO, and Lunar Crater Observation and Sensing Satellite, or LCROSS, spacecraft are set to launch together to the moon aboard an Atlas V rocket on June 17. Three...