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Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode
From: |
Greg Troxel |
Subject: |
Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode |
Date: |
Fri, 17 Apr 2015 13:37:54 -0400 |
User-agent: |
Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.4 (berkeley-unix) |
Sanjeev Gupta <address@hidden> writes:
> On Sat, Apr 18, 2015 at 1:20 AM, Greg Troxel <address@hidden> wrote:
>
>> I don't follow. If we can figure it out and ensure there are no privacy
>> leaks when getting data,
>
> I checked, I have to register for a "token" with uBlox
That's probably about getting stuff from their servers, and it's bogus
to have to register. But if we understood, and could get
almanac/ephemeris in and out, it would be simple enough to set up a
server that just had the data, without any registration.
I was more concerned about protocols to get the A-GPS data passing some
estimate of location when they asked. But identifying the user is an
issue, too.
>> it seems that TTFF could drop from perhaps
>> minutes to seconds. TTFF can be especially long when there are frequent
>> sky view obstructions.
>>
>
> The GR-801 (ublox M8) datasheet says:
>
> TTFF (Time to First Fix)
> (50%, -130dBm, autonomous)
> Hot Start: 1.5 sec
> Cold Start: 26 sec
Yes, but that assumes solid signal the whole time, which isn't what
happens when you are moving in non-flat terrain.
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- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, (continued)
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Paul Fertser, 2015/04/19
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode,
Greg Troxel <=
Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
[gpsd-dev] [PATCH 8/9] Remove dead links., Sanjeev Gupta, 2015/04/17
[gpsd-dev] [PATCH 9/9] Remove lots of dead links., Sanjeev Gupta, 2015/04/17