- Settore: Aerospace
- Number of terms: 16933
- Number of blossaries: 2
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The Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research.
Two-way communications mode wherein the spacecraft generates its downlink frequency based upon the frequency of the uplink it receives.
Industry:Aerospace
For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.
Industry:Aerospace
In telemetry, one particular measurement to which changing values may be assigned. See Chapter 10.
Industry:Aerospace
A small motion in the Earth's rotation axis relative to the surface, discovered by American astronomer Seth Carlo Chandler in 1891. Its amplitude is about 0.7 arcseconds (about 15 meters on the surface) with a period of 433 days. It combines with another wobble with a period of one year, so the total polar motion varies with a period of about 7 years. The Chandler wobble is an example of free nutation for a spinning non-spherical object.
Industry:Aerospace
The inward acceleration of a body revolving around another body.
Industry:Aerospace
The outward-tending apparent force of a body revolving around another body.
Industry:Aerospace
Reflecting scheme in antennas and telescopes having a primary and a secondary reflecting surface to "fold" the EMF back to a focus near the primary reflector.
Industry:Aerospace
The main frequency of a radio signal generated by a transmitter prior to application of any modulation.
Industry:Aerospace
