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modulating time markers

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  modulating time markers Hul Tytus <ht@panix.com> - 2025-01-18 16:16 +0000
    Re: modulating time markers "Niocláiſín Cóilín de Ġloſtéir" <Master_Fontaine_is_dishonest@Strand_in_London.Gov.UK> - 2025-01-18 18:39 +0100
    Re: modulating time markers Paul Rubin <no.email@nospam.invalid> - 2025-01-18 11:35 -0800

#32313 — modulating time markers

   I'm looking into a time marker modulated onto a rf carrier that is 
simple and at the same time accurate. The marker on the low frequency 
signal carrying the US time reference which is said to invert the carrier 
to mark the time certainly sounds simple. The remarkable accuracy of the 
RTK GPS devices, actual inches are claimed, suggests a very accurate 
means of reading the time marker.
   Anyone know of a text that deals with such circuitry or perhaps a 
schematic of a gps reciever with enough detail to show how it's done?

Hul

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#32314

Dear Hul Tytus:

Happy New Year!

This is not as requested but might help to go to where you want to. In the 
Year that is called 2009 I reviewed "Fundamentals of Global Positioning 
System Receivers - A Software Approach" by James Bao-yen Tsui. It does not 
contain schematics. My copy is in storage so I cannot look it up to say 
what its index or table of contents say about encoding timing or radio 
signals. Sorry! Good luck!

HTTPS://ACCU.org/bookreviews/2009/gloster_1826

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#32315

Hul Tytus <ht@panix.com> writes:
>    Anyone know of a text that deals with such circuitry or perhaps a 
> schematic of a gps reciever with enough detail to show how it's done?

GPS is extremely complicated and studying it is probably not worth your
while if you're only trying to modulate a time signal onto an RF
carrier.  For that, look at basic RF digital modulation techniques.  Are
you trying to get microsecond accuracy?  Sub-millisecond?  Sub-second?
It gets easier at coarser levels.  You stop having to account for speed
of light delay between the transmitter and receiver, relativistic
corrections because of the endpoints being in motion, etc.

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