# Aircraft clock with gps time updating inallurl php id

Assuming that you have knowledge of the GPS space vehicle (SV), the $x_i,y_i,z_i$ values are known from the satellite ephemeris (this can be obtained from publically available data, and more accurate ephemeris can be obtained via more secure methods).

There are now 4 unknowns, implying that we need 4 GPS SVs to solve for the user location $(x_u,y_u,z_u)$ and time delay.

Various errors can be accounted for by augmenting the system of equations to include, but in no way limited to, ionospheric & tropospheric delays, relativity effects, and clock errors present in the receiver. I'll continue to looking for how gps receivers get rid of time lag and find out the exact atomic clock time. Do you live in an area where you get ordinary radio reception for radio clocks?

A multitude of simple and complex differential methods exist to essentially exploit similar delays between measurements and remove them without even solving for them (e.g., differential GPS and real time kinematics Here is a short paper that discusses the observation equations and, more speficially, the GPS signal and code-generation. I see today, on my android phone's time settings, there is an option about synchronizing the time with gps. (Radio clocks only cost a few dollars now, you should buy one en.wikipedia.org/wiki/Radio_clock ) Note that the "convenience time" displayed on GPS receivers -- I'm not totally clear that that is MEANT TO BE "utterly synchronised" with the world's standard atomic clocks. If that is meant to be official atomic time, and you're asking about adjusting for the distance-to-the-satellites, it would just a trivial calculation in the software.

The diagrams showing the intersecting spheres are a simplification to make it easier to understand.

To give a big picture view of how the GPS solution is determined, consider the following equation: $\rho_i = \sqrt c\Delta t$ where $\rho$ is essentially a range from the user to the GPS satellite, $x,y,z$ are position coordinates, the subscript $i$ indicates the particular satellite, $c$ is the speed of light, and $\Delta t$ is a time delay.

If your i Phone finds your location and you're in a new time zone, it'll change the time.

You can tell exactly how much closer you are by the specific time difference.

Repeat the calculations with a few other satellites and you will find that there is only one place (and time) that the receiver can be located.

No matter how imprecise the 3 distances are, as long as their spheres overlap they will form two perfectly defined points.

But that does not mean the points relate to the real world.

The process of synchronizing time is reduced to the problem of minimizing the error by adjusting local time.

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