[talk-au] new toy found by son

John Smith deltafoxtrot256 at gmail.com
Thu Oct 1 13:34:43 BST 2009

2009/10/1 Elizabeth Dodd <edodd at billiau.net>:
> On Thu, 1 Oct 2009, John Smith wrote:
>> Oh that's easy then, get him to figure out how to semi-sync with the
>> secondary GPS frequency, which is what high end surveying equipment
>> does, you don't need to lock onto the signal, just get close enough to
>> calculate the atmospheric effects on the L1 signal, and do it cheaply
>> enough we can get less than 1m accuracy with consumer grade kit :D
> he's not using a D-GPS setup

Using both GPS freq's isn't D-GPS, the biggest unknown with the
regular GPS signal is delays in the ionosphere, being able to
establish that using the secondary/military GPS freq takes out the
uncertainity and you get a much more accurate signal

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