Satellite Wave Propagation
Satellite antenna propagation invo
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Satellite antenna propagation involves a number of techniques and different ranges for sending and receiving signals. New measurement techniques for testing antennas ar also being developed and implemented to analyze the propagation field and to understand what happens to the signal under different conditions. An examination of the issues raised with reference to antenna propagation and the measurement of performance shows the nature of the field today and some of the directions in which it is moving. The discussion below shows how technicians analyze existing antenna configurations and determine new ways of assuring that signals are sent and received with as little distortion as possible. One important function of these researches is to develop technology to pinpoint the direction of signals and so to determine the location from which they are emanating. Such technology also makes it possible to send signals more precisely to a specific location. NASA's Advanced Communications Technology Satellite (ACTS) Program is one important technological system being used by more and more companies and the U.S. government to place satellites in orbit, to identify and secure those orbits, and to communicate on various levels. The transmission of electromagnetic waves through space has become common over the past century. The antenna is the critical interface between the hardware and space, and antenna testing is a major field to assure that t
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ecision location was suggested in 1995 in an article which discussed how the Tensor program for determining the location of satellites may preclude at least four other methods of traditional satellite attitude and orbital determination. A dozen satellites have been rigged to navigate using onboard GPS receivers Early in the experiment, more primitive onboard receivers acquired ranging signals from a GPS constellation of only five or six functioning satellites. Today, onboard GPS receivers gather signals from an essentially complete 24 satellite GPS constellation. Early spaceborne receivers weighed approximately 28 kilograms, while modem units now are often under three kilograms. Antennas set to receive GPS signals have been placed as the satellite orbited a circular, sun synchronous pattern of 380 nautical miles. The Landsat antennas used to pick up the GPS signals were mast mounted to connect the high gain antenna to the main body of the satellite. However, engineers at Magnavox estimated that, with a 16 to 19 GPS operational satellite constellation, the spaceborne receiver would yield orbital positioning errors of less than 10 meters. Logic upsets caused by various highly energetic charged particles careening though o
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Some common words found in the essay are:
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Approximate Word count = 2653
Approximate Pages = 11 (250 words per page)
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