[time-nuts] Carrier phase tracking

Dave Brown tractorb at ihug.co.nz
Tue Feb 20 05:13:45 EST 2007

 Try browsing chapter three here-


I have trouble getting my head round some of this stuff as well and 
found it a useful read.

----- Original Message ----- 
From: "Peter Vince" <pvince at theiet.org>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Tuesday, February 20, 2007 10:58 PM
Subject: Re: [time-nuts] Carrier phase tracking

>>I don't wish to offend, but that is totally wrong.  Even if every
>>satellite were on the exact same frequency, with the exact same
>>doppler, and the exact same direction, you would still have no 
>>separating the carriers of the multiple satellites.  The reason is
>>that the satellites do not transmit carrier.  Here is how:
>>   Everybody here understands how the PN codes are tracked by
>>despreading.  The despreading operation is multiplication, and when
>>you multiply the PN code by the original signal you get a carrier,
>>only from that one satellite.
> Do you?  Or do you just get the modulation?
> Sorry if I'm being naive, just trying to get my head around this 
> thorny topic.
> Thanks,
> Peter
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