Re: The GPS Myth, Mythbusted ?

On Jun 15, 7:42 am, Tom Roberts <tjroberts...@xxxxxxxxxxxxx> wrote:
Quatro wrote:
On Jun 13, 10:51 pm, Tom Roberts <tjroberts...@xxxxxxxxxxxxx> wrote:
relativity accumulates, because gravity is monopole,
then motion also accumulate, must be also monopole

Hmmm. The time difference obtained in comparing identical clocks in a
satellite and on the ground accumulates because they are located at
different heights in a gravitational potential, and are moving at
different speeds relative to a locally-inertial frame (here the ECI).

bull*** Sir, any children knows that in kindergarten

its about monopoles, they always accumulate

you dont understand Maxwell equations, and also tensors
and partial differential equations


This has nothing to do with any multi-pole expansion of "gravity" (or of

wrong, you cannot expand gravity, it is a monopole, end of story

"motion" which AFAICT cannot possibly be expanded as multi-poles).

while i can see now, that magnetism is not a monopole,
so the satellites in motion does not accumulate,
the only other theory i know which accumulate is entropy
which must also be a monopole

You are rather confused about what a multi-pole expansion is, and how
the various terms in such an expansion are related to physics.

you dont understand

and also magnetism also accumulate at GPS level,
because your car will always be in the same region,
while the satellites also same region, therefore the
GPS will have a persistent bias because the Earth
magnetic field on electronics

including the "atomic" clock


a modern GPS receiver does not use its own
clock in determining its position, it uses 4 (or more) satellite
signals. In effect it is using the vastly more accurate satellite clocks
instead of its own, rather poor clock. Indeed, there is no need for a
clock in the receiver at all.

but Sir, the calculations requires local time in
order to do the position properly

No, a direct measurement of local time is not needed. With 4 or more
satellites in view, a given event at the receiver is specified with 4
unknowns: latitude, longitude, altitude, and local time. These 4
unknowns can be determined by fitting to the signals received from 4 or
more satellites. No local value of local time is needed (the receiver
must be able to accurately measure time differences of a few seconds; an
ordinary crystal oscillator is sufficiently accurate for this). The more
satellites that contribute data to the fit, the more accurate the result
is likely to be.

exactly what is been told, you dont even need
an atomic clock to driven the satellites, more
important is that the satellites remains somehow
synchronized

the alleged frequency reduction from a 10.23 MHz to 10.22999999543
MHz
is bull***, not necessary


you cannot trust on a local time you get from
far away in the wilderness !!!

No. But GPS receivers do trust the fit I described above -- it
DETERMINES the local time. To much better accuracy than any local clock
could do (unless it is a set of atomic clocks).

right, as said

the alleged frequency reduction from a 10.23 MHz to 10.22999999543
MHz
is bull***, not necessary


Typical errors for a single fit as described above are
on the order of 10 ns, FAR better than any crystal or
mechanical oscillator can do. A GPS receiver at rest
on the surface and with the right software can to a
lot better (averaging over many hours)....

Tom Roberts

learn this

there are no correction because the relativity done in software
anywhere

there are no correction because the relativity done in hardware
anywhere

thank you very much

The CRT myth - mythbusted, booong!
The GPS myth - mythbusted, boooong!
.