Mon, Feb 09, 2015
Aero-Terms!
Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.
Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.
GPS Satellite Constellation
The baseline satellite constellation consists of 24 satellites positioned in six earth-centered orbital planes with four operation satellites and a spare satellite slot in each orbital plane. The system can support a constellation of up to thirty satellites in orbit. The orbital period of a GPS satellite is one-half of a sidereal day or 11 hours 58 minutes. The orbits are nearly circular and equally spaced about the equator at a 60-degree separation with an inclination of 55 degrees relative to the equator. The orbital radius (i.e. distance from the center of mass of the earth to the satellite) is approximately 26,600 km. With the baseline satellite constellation, users with a clear view of the sky have a minimum of four satellites in view. It’s more likely that a user would see six to eight satellites. The satellites broadcast ranging signals and navigation data allowing users to measure their pseudoranges in order to estimate their position, velocity and time, in a passive, listen-only
mode.
More News
Takeoff Roll The process whereby an aircraft is aligned with the runway centerline and the aircraft is moving with the intent to take off. For helicopters, this pertains to the act>[...]
“We’re proud of the hard work that went into receiving this validation, and it will be a welcome relief to our customers in the European Union. We couldn’t be mor>[...]
Also: 1800th E-Jet, Uncle Sam Sues For Landing Gear, Embraer Ag Plane, Textron Parts A friend of the family reported that Lt. Col. (Ret.) Richard Glenn Rutan flew west on Friday, M>[...]
Also: Virgin Galactic, B-29 Doc to Allentown, Erickson Fire-Fighters Bought, FAA Reauthorization After dealing with a big letdown after the unexpected decision by Skyreach to disco>[...]
"Aircraft Spruce is pleased to announce the acquisition of the parts distribution operations of Wag-Aero. Wag-Aero was founded in the 1960’s by Dick and Bobbie Wagner in the >[...]