scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 3,268
The new Avionics Modernization Program AMP systems installed in the F-111E and EF-111Ahave raised their share of questions so I have decided to continue my series of Everything YouAlways Wanted To Know handouts to you pilots navigators and maintenance technicians onhow the cotton-picken thing works This informational pamphlet is an overview of the GPSsystem as a whole NOT the system- specific hardware that you find in your respective aircraftIll cover the basic theory of operation here and if there proves to be sufficient interest inplatform-specific installation that will be covered in a later supplement THE BASICS GPSworks by triangulation the process of finding where you are by the angle to fixed known pointsIn the old method of DME position determination you would tune one DME channel and draw acircle on your chart around the DME transmitter the radius of which was your DME reading innautical miles Then youd tune in a second DME station and repeat the process On your chart atthis point there would be two circles whose lines intersected at two points Even a vague guess ofyour whereabouts would be enough to discard the bogus point and youd be left with a prettygood idea of your position Better yet take a cut from a third DME transmitter and draw a thirdcircle on your chart Now youd have three intersecting circles and your position would be insidethe little triangle formed by the intersection of the three circles Got the picture This is basicallyhow GPS triangulates except that instead of circles were dealing with intersecting spheresTIMING IS EVERYTHING Think of GPS satellites as floating DME stations They move alongin orbit and that complicates things but forget about that for the moment How can we measuredistance The satellites in the GPS are some 10900 miles up but theyre not geostationarytheyd have to be much higher and thus would require more power to reach earthbound GPSreceivers and they travel along at a ground speed of about five
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA