[time-nuts] Fwd: CGSIC: FW: New NANU 2014090

Bob Camp kb8tq at n1k.org
Tue Dec 16 20:42:48 EST 2014


HI

> On Dec 16, 2014, at 8:14 PM, Gregory Maxwell <gmaxwell at gmail.com> wrote:
> 
> On Wed, Dec 17, 2014 at 12:01 AM, Jim Lux <jimlux at earthlink.net> wrote:
>> On 12/16/14, 3:36 PM, Magnus Danielson wrote:
>> what about one of the software receivers? I would think that making  L2 and
>> L5 filters isn't that tough, so all you need is the back end.
> 
> I'm pretty sure GNSS-SDRLIB supports L2C,  you can see it working with
> a ~$400 bladerf
> 
> http://www.rtl-sdr.com/real-time-gps-positioning-bladerf/
> 
> Though getting dual band, in phase, requires something like a $1100
> USRP B210... and that that point you're getting in to the price-points
> where you can find surplus survey receivers and such.
> 
> From a timenuts perspective, it may be more interesting to go the SDR
> route, since the survey receiver is not likely to have a lot of
> affordances for timing applications and there is a lot of interesting
> things you could do in software.

That qualifier is indeed something I should have stated earlier. My assumption is that a high quality timing receiver is the target. The whole fixed location / single sat solution / per sat solution  stuff is what I’m thinking about.

No I didn’t mention that earlier … I should have.

Bob 

> 
> There have been some people talking about GNSS targeted SDRs, e.g.
> things with 4x  in phase down mixers and backing ADCs that could
> simultaneously capture every current/known GNSS signal and send them
> down to the computer, at a reasonably low price... but I think none
> have moved past the prototyping phase.
> 
> The nearest I'm aware that seems actually available is
> http://www.onetalent-gnss.com/ideas/software-defined-radio/sdrnav40
> but I don't really know anything about it. (e.g. if it's real, what
> the software support story is, etc.)
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