[DOC] [TLE] Communications satellite - Wikipedia [PAR] A communications satellite is an artificial satellite that relays and amplifies radio 
... There are over 2,000 communications satellites in Earth's orbit, used by both .... 
in the sky to a fixed point on Earth continually like a geostationary satellite, but ... 
so one will always be in the sky for transmission of communication signals. [DOC] [TLE] Introduction to Satellite Communication - SlideShare [PAR] Aug 3, 2014 ... 61 are generally used with a radio transmitter and receiver. .... To keep the 
satellite in a stable circular orbit, the following equation must hold: Fg .... for 
transmitting television signals to cable companies Broadcasting satellite ... 
Looking from a fixed point from Earth, these satellites appear to be stationary. [DOC] [TLE] Understanding the Global Positioning System [PAR] There are now at least 24 satellites orbiting the earth at an altitude of about ... The 
system is designed to maintain full operational capability even if two of the 24 
satellites fail. ... The satellite signals require a direct line to GPS receivers and 
cannot .... Usually the receiver can discard one of the last two points because it is
... [DOC] [TLE] Geostationary Satellites [PAR] The most prominent satellites in medium earth orbit (MEO) are the satellites ... 
Communications satellite in a stationary position or slot high above the earth. 
Satellite dish or receiver installed on a house. These dishes point to a 
geostationary satellite. ... The increase in noise is so severe that a signal outage 
usually results. [DOC] [TLE] How do satellites work? - Explain that Stuff [PAR] Aug 5, 2016 ... Satellites, in short, help us live within Earth's limits precisely because ... job a 
satellite does usually determines both how far away from Earth it needs to ... 
These boost the incoming signals and change their frequency, .... GPS navstar 
satellites are in MEO orbits roughly 20,000 km (12,000 miles) above our... [DOC] [TLE] Global Positioning System Overview - University of Colorado Boulder [PAR] These space vehicles (SVs) send radio signals from space. GPS Satellite; The 
nominal GPS Operational Constellation consists of 24 satellites that orbit the 
earth in ... the user with between five and eight SVs visible from any point on the 
earth. ..... Tracking carrier phase signals provides no time of transmission 
information. [DOC] [TLE] Satellites - GMRI.org [PAR] Mar 29, 2012 ... It stays above the same point on Earth all the time. To maintain the same 
rotational period as the Earth, a satellite in geostationary orbit ... appears to 
remain fixed in one position (it's really orbiting at the same rate as the Earth .... 
Many of these satellites transmit signals directly to ground stations in schools,... [DOC] [TLE] artificial satellite facts, information, pictures | Encyclopedia.com ... [PAR] Unless corrections are made, orbits are usually elliptical; perigee is the point on 
... the earth) is determined by its height above the earth; the higher the satellite, 
the ... in orbit, identifying and maintaining contact requires precise tracking 
methods. ... receives a signal from the earth, amplifies it, and transmits it to 
another point... [DOC] [TLE] Satellite Technology Challenges - How Satellites Work - Electropaedia [PAR] Satellites in these orbits fly over the Earth from pole to pole in an orbit ..... in a 
fixed attitude, allowing the solar energy capture and radio transmission and ..... 
The Signal to Noise Ratio, (specified in dB), at any point in a communications link 
is the ... The noise figure of a modern satellite ground station receiver is typically 
less... [DOC] [TLE] US5587715 - Google [PAR] Dec 24, 1996 ... Second, the satellite signals are received at the fixed point and processed ... e) 
transmitting a signal indicative of the object's approximate ... The method for 
tracking the one vehicle as claimed in claim 1, ..... above the earth and maintain 
orbit longitudinal spacing angles of about 60 degrees from each other. [DOC] [TLE] Types of Orbits, or Why Satellites [PAR] respect to the Earth, the elevation angle above the horizon of the satellite for 
different ... can observe, and the time it takes for a transmission signal to travel 
between ... fixed relative to the

Question: To transmit signals, these vehicles usually maintain orbits above a fixed point on the globe
Answer: satellites