[time-nuts] 5370B on eBay, carrier phase tracking GPS receiver

Brooke Clarke brooke at pacific.net
Sun Feb 18 22:36:22 EST 2007


Hi Bruce:

Is there a paper describing the method?

Have Fun,

Brooke Clarke

Have Fun,

Brooke

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com



Dr Bruce Griffiths wrote:

>Brooke Clarke wrote:
>  
>
>>Hi Didier:
>>
>>Many GPS receivers output carrier phase data but it's usually used in 
>>post processing to get survey grade position accuracy.  Since the code 
>>phase position accuracy is larger than a wavelength the receiver does 
>>not know how many integer wavelengths to add.  But because of satellite 
>>movement this can be figured out later.
>>
>>The exception is the "in development" carrier phase timing which as far 
>>as I know can only be done using the Ashtech Z12.
>>The Motorola GPS receivers have carrier phase data available, but when 
>>the 8 channel models were current there was no way to use it without 
>>spending a small fortune.  I think today there's a Motorola binary to 
>>RINEX converter.
>>
>>Have Fun,
>>
>>Brooke Clarke
>>
>>  
>>    
>>
>Brooke
>
>It is not necessary to use a dual frequency phase tracking receiver to 
>significantly improve the disciplining of an OCXO over the performance 
>with a timng receiver.
>A single frequency phase tracking receiver is more than adequate.
>The largest problem is determining the ionospheric delay.
>However this can be done by exploiting the difference between the phase 
>and group velocities in a dispersive medium (like the ionosphere).
>Carrier phase measurements can be combined with code tracking 
>measurements to derive the difference between the phase and group delays.
>
>Commercial implementations of this technique are available from Quartzlock.
>They use a single channel receiver, which switches between satellites.
>
>Disciplining an oscillator frequency is an easier problem than deriving 
>a geodetic solution, constant time offsets are of little consequence.
>
>Bruce
>
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>  
>


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