[time-nuts] GPS receiver stuck at South Pole :)

bg at lysator.liu.se bg at lysator.liu.se
Mon Apr 19 18:09:03 EDT 2010


Hi Jean-Louis,

I grew up in Borås. ;-) Actually I spent quite some time less than 5km
away from SP - where I guess you had your business. There is a "hole" in a
skyplot where we never see GPS birds, but it is somewhat compensated with
SVs rising quite a bit over the north pole. Less high elevation satellites
but instead more low/medium elevation satellites to the north, than in
France.

It is not that uncommon that there are more satellites available than my
12 channel all-in-view receivers can track... ;-) One weak spot is the
rather low elevation of GEOs, which will give frequent loss of EGNOS
(SBAS) when driving a car in anything but the flattest terrain. On the
other hand the current performance level of basic GPS is plenty enough for
car navigation.

--

   Björn

> Sorry for late reply, I was away from home.
> I spoke of high latitude problem mostly from book knowledge (GPS system
> specifications), et had in maind the navigation application, where you
> need
> at least 3 (2D+time fix) or better 4 (3D+time fix) birds.
> Otherwise, my higher latitude experience  was around Borås, Sweden, and
> even
> if I had the feeling to get rather less bird than in South of France, my
> Garmin (iQue3600) was still very useable up there.
> Have a nice day,
> Jean-Louis
> ----- Original Message -----
> From: <bg at lysator.liu.se>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Friday, April 16, 2010 9:21 AM
> Subject: Re: [time-nuts] GPS receiver stuck at South Pole :)
>
>
>>> Congratulations ;-}
>>> Most of the time, it's rather difficult to get a GPS working at high
>>> latitudes...
>>
>> Is it high or low latitudes at the South Pole?  ;-)
>>
>> Back to your GPS experiences... at what latitudes have you had problems?
>> What kind of application/type of receivers?
>>
>> --
>>
>>   Björn
>>
>>
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