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

[Brooke Clarke]

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

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



Didier Juges wrote:

>John,
>
>.........
>
>I remember seeing a number of postings on time-nuts (must have been 
>Bruce) advocating the increased performance of carrier phase tracking, 
>but I need to educate myself about what it is and what good it can do 
>for me :-)
>
>Any feedback regarding whether I am getting something useful, or just 
>another item to go in the junk box (I did not break the bank, it went 
>for $0.99, and $10 shipping...)
>
>Didier KO4BB
>
>
>  
>