Gps Definition and 128 Threads

Hello i need help regarding GPS devices and the physics that goes into them. This may include, how the signal travels from source to GPS. Refractional waves and atmosphere interference. The process that goes into GPS devices in finding ur position. (Physics Based) thank you =]

hello i was wondering the physics that goes into transmitting waves such as: reflection etc.. To achieve a GPS signal, as well as the process of achieving it.

a wiki type GPS library ? Pretty much everyone has a GPS navigation system now, whether it be in their cell phone or in their car. with all the new houses being built and new highways a lot of times you find yourself in the middle of a field according to the gps because that new road has not...

Hello, friends! I've google about the question below but no success! The question is: Gps signals inside buildings are nonexistent or very weak, but mobile phone and am and fm radio signals are good, so the question is: why gps satellites and mobile phone comunications don't use emission...

GPS (Global Positioning System) satellites orbit at an altitude of 2.0×10^7 m. Find the orbital period.(hours)I use the equation T=(2pi/sqrt(GM))r^(3/2). Shouldnt that be the correct way of doing it? I know I am supposed to add the altitude to the radius of the earth, G is known, M of Earth is...

Each of the 24 GPS satellites holds four atomic clocks! Why four and not one or two? They are not cheap! Thanks

Homework Statement The global positioning system GPS uses the fact that a receiver can get the difference of distances to two satellites. Each GPS satellite sends periodically signals which are triggered by an atomic clock. While the distance to each satellite is not known, the difference from...

I'm working through "Exploring Black Holes" by Taylor and Wheeler. Their first project is on the GPS system and how GR must be accounted for. At the end you arrive at the conclusion that the satellite atomic clock will advance approximately 38,700 nanoseconds a day with respect to an atomic...

Is it plausable to take into account the speed of the Earth's spin when calculating tmie dilation for satellites and GPS receivers? You could take into account the satellites spining against the Earth's orbit, with the Earth's orbit and at an angle? I put it into my project but is it a...

Hi all I wasnt sure where to place this thread. I am currently doing a project on GPS and have deceided to take the root of studying the relativity side of GPS. All I am asking does anyone know of or have any ideas of some experiments I could do, or some computer programmes to perfrom a...

I've read that the GPS system has to take into account the Sagnac effect when sending signals from the satellites to the Earth. For those of us who are unfamiliar with the Sagnac effect, it is the delay in receiving(or shorter time in receiving) the signal due to the rotation of the Earth while...

Homework Statement The GPS (Global Positioning System) satellites are approximately 5.18 m across and transmit two low-power signals, one of which is at 1575.42 MHz (in the UHF band). In a series of laboratory tests on the satellite, you put two 1575.42 MHz UHF transmitters at opposite ends...

[SOLVED] GPS and special relativity Homework Statement time dilation of gps receivers and satellites Homework Equations \Delta\tau = \gamma\Delta t The Attempt at a Solution so its a part of my project, my tutor has worked it out as using the above equation and has gotten...

http://www.sciencedaily.com/releases/2008/02/080206150703.htm

[SOLVED] GPS and Special relativity (Graph) Homework Statement The image attached is a graph I'm supposed to be able to figure out. I'm supposed to be able to figure out the distance between a Satelite and a GPS reciever. X axis: Time / seconds Y axis: Signal strength / no unit There is no...

So I'm doing a report on special relativity and GPS and kinda at a loss what to do: 1. I've actually found several sites denoting the need to calibrate for relativistic effects when calculating locations, and I'm writing a report on just the opposite, that how is the system effected / how...

This is an old video of the GPS launch back in Jan '97. The launch controllers sit in a blockhouse fairly near the launchpad, which is kind of cool. Working in a restricted area, they always got the good parking spaces. http://shock.military.com/Shock/videos.do?displayContent=157296&ESRC=dod

Suppose i have two clocks on Earth showing 12:00 hours. After, one of the clocks is put in a gps satellite for a year. After one year that clock returns to earth. Due to relativistic effect what time that clock shows? Less than 12:00? If so why?

GPS modules produce a very accurate 1 second timebase signal, rms differency of about 20nS. How do you suggest of using that to split it into a 1000 pieces = 1000Hz = 1000ms ? My idea is to make a generator with a quartz chrystal and drive it into a counter module, carefully selected divide...

The satellites of GPS sysstem had been adjusted so they compensate for GR and SR dilation of time due their velocity and less gravity. This is what I found on Internet ( Not all agree ). Is that true ? But I´d like to know if the frequency of the ground stations that control the...

I am looking over the Project A: Global Positioning System is Exploring Black Holes; introduction to General Relativity by Taylor and Wheeler. At first, they convincingly suggest that the time dilation caused by the differences in radius from Earth clocks to the satelight clocks will cause the...

Hello there! Am actually doing my end of year project on GPS and GR. It's actually a review of Ashby's work. I am kinda stuck with a term. In the choice of metric, Mr Ashby (God bless him! ;-) ) makes use of the Langevin metric. He propounds that it is well know. But lo and behold, on...

I heard somewhere that the satelites use by Global Position System (GPS) device is open for public use , is it right ? If the satelite is open for public use , then is it possible for me to make my own GPS and how to make the GPS ?

Quoted from http://hyperphysics.phy-astr.gsu.edu/hbase/gps.html#c1" How do they know which of the points is the correct one? (see sentence in blod) Thank you!:approve:

how is relativity theory applied to gps? thanks

I've always been told that GPS does great horizontally, but not so great vertically. Is the reason simply because the Earth is blocking any satellites that would provide info below the receiver? Is vertical precision 1/2 as reliable as horizontal?

Hi friends, I'm a user of Meade's 12" LX200GPS and I was looking for the software to connect my telescope to my pc, I installed "Starry night pro" version 4.5 and ACP3 but they didn't work. Starry night only had LX200 & AutostarII in the list it supported but not LX200GPS. Does anybody know...

It has been said that a russian company has provided Iraq with a system that destroys GPS navagational status of onboard cruise missiles, rendering the missile to be co-ordinless? As the first of these missiles that have been 'un-guided', how simple is it to actually 'jam' GPS sytems?..is it...