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Global Positioning Systems
Beginning of essay
The new Avionics Modernization Program (AMP) systems installed in the F-111E and EF-111A have raised their share of questions, so I have decided to continue my series of "Everything You Always Wanted To Know" handouts to you pilots, navigators, and maintenance technicians on how the cotton-picken' ....
Middle of essay
.... along in orbit and that complicates things but forget about that for the moment. How can we measure distance?
The satellites in the GPS are some 10,900 miles up, but they're not geostationary (they'd have to be much higher and thus would require more power to reach earthbound GPS receivers) and they travel along at a ground speed of about five miles a second. Like DME, GPS measures the time that it takes the signal to reach the receiver. However, unlike DME, the receiver doesn't have the benef.... |
| Number of words: 3319 |
Approximate pages: 13 |
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