2009/10/2 Sam Couter :
> I thought AGPS didn't help with accuracy, it just helps with faster
> satellite aquisition by downloading ephemeris data instead of searching
> blindly for visible satellites. It won't help with surveying a tunnel.
Depends what type of AGPS I think, in the case of phone ne
John Smith wrote:
> Or just use a phone with AGPS from the phone network, when I have 3G
> connectivity on the phone I usually get 2m accuracy and works inside
> buildings etc. Now we just need 3G connectivity Australia wide :D
I thought AGPS didn't help with accuracy, it just helps with faster
s
2009/10/1 Elizabeth Dodd :
> On Thu, 1 Oct 2009, John Smith wrote:
>> > 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
On Thu, 1 Oct 2009, John Smith wrote:
> > 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
2009/10/1 Elizabeth Dodd :
> 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 th
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 s
2009/10/1 :
> Accelerometers would be an excellent solution for mapping tunnels though.
> Especially since you're only talking about a short-ish time span and you can
> potentially have 2 accurate calibration points (one at each end of the
> tunnel). I guess if the accelerometer could be mounted i
2009/10/1 Elizabeth Dodd :
>> The higher the gain the better the accuracy etc, most GPS antenna are
>> tiny so if you make a massive one you should get good readings :)
> because he wants a degree in surveying, that's why
> so he has to produce something new / different
Oh that's easy then, get h
y, October 1, 2009 9:58 pm
Subject: Re: [talk-au] new toy found by son
To: Liz
Cc: talk-au@openstreetmap.org
> 2009/10/1 Liz :
> > he was hoping that gps+accelerometers+gyros would provide
> accurate cheap
> > mapping of mtb trails
>
> Why not just build/buy a better anten
On Thu, 1 Oct 2009, John Smith wrote:
> 2009/10/1 Liz :
> > he was hoping that gps+accelerometers+gyros would provide accurate cheap
> > mapping of mtb trails
>
> Why not just build/buy a better antenna for the GPS?
>
> The higher the gain the better the accuracy etc, most GPS antenna are
> tiny so
2009/10/1 James Livingston :
> On 01/10/2009, at 8:53 PM, John Smith wrote:
>> I tried to use it to augment GPS data but the math ended up doing my
>> head in so I'm not sure how much use this would be compared to a 4 or
>> 5Hz GPS logger alone unless someone is super duper at velocity math
>> that
2009/10/1 Liz :
> he was hoping that gps+accelerometers+gyros would provide accurate cheap
> mapping of mtb trails
Why not just build/buy a better antenna for the GPS?
The higher the gain the better the accuracy etc, most GPS antenna are
tiny so if you make a massive one you should get good readi
On Thu, 1 Oct 2009, James Livingston wrote:
> On 01/10/2009, at 8:53 PM, John Smith wrote:
> > I tried to use it to augment GPS data but the math ended up doing my
> > head in so I'm not sure how much use this would be compared to a 4 or
> > 5Hz GPS logger alone unless someone is super duper at vel
On 01/10/2009, at 8:53 PM, John Smith wrote:
> I tried to use it to augment GPS data but the math ended up doing my
> head in so I'm not sure how much use this would be compared to a 4 or
> 5Hz GPS logger alone unless someone is super duper at velocity math
> that is.
It wouldn't be too hard, just
2009/10/1 Liz :
> http://www.sparkfun.com/commerce/product_info.php?products_id=8725
I've played with the accelerometer on the android handset I have, it
can do 20 or 30 updates per second depending how busy the CPU is with
other interupts.
I tried to use it to augment GPS data but the math ended
http://www.sparkfun.com/commerce/product_info.php?products_id=8725
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