Hi Joe,

On 03/31/2018 01:16 PM, Joseph Gray wrote:

I have advocated for receivers able to handle multiple frequencies and
multiple GNSS for some time, sneaking it into documents, so there should
be some preparations for this now.

The benefit is naturally redundancy, but also higher precision.

Natural I would enjoy cheap multi-frequency receivers myself, but I
would never admit that this would be a reason for advocating it. ;-)

Cheers,
Magnus

Magnus,

When I can buy one of these new, multi-frequency receivers, I'll remember
to thank you :-) I wonder if any of the three will be available this year.
The Broadcom chipset in phones will be nice, but I'd also like a standalone
module from anyone. More fun stuff to play with.

Joe Gray
W5JG

On Sun, Apr 1, 2018 at 3:15 AM, Magnus Danielson <magnus@rubidium.dyndns.org

Joe,

I'm not sure I had much influence, but I at least try to advocate for it
to become a good market, so hopefully it will be affordable. It has
actually been affordable for quite some time, so going multifrequency
should be the next step and with that the benefits.

Cheers,
Magnus

On 04/01/2018 07:04 PM, Joseph Gray wrote:

Hi

I’d bet a warm glass of beer  ( pick up only, no free delivery ) that you will not see them in user level
modules ( = something you can fire up)  at a rational price ( < $500)  for quite a while ( = years …).
The target market is integration in self driving / autonomous vehicles. If you are GM or Toyota,
they will gladly support you. For the rest of us …. go to the back of the line ….. That’s been the pattern
on this stuff like this for quite a while.

Bob

Hi All;

I think the real break through is using these different constellations and their different frequencies and looking at carrier phase verses timing elements. This should allow the removal of propagation delay.

Cheers;

Thomas Knox
actast@hotmail.com

From: time-nuts time-nuts-bounces@febo.com on behalf of Magnus Danielson magnus@rubidium.dyndns.org
Sent: Sunday, April 1, 2018 2:40 PM
To: time-nuts@febo.com
Cc: magnus@rubidium.se
Subject: Re: [time-nuts] New GNSS chipsets

Joe,

I'm not sure I had much influence, but I at least try to advocate for it
to become a good market, so hopefully it will be affordable. It has
actually been affordable for quite some time, so going multifrequency
should be the next step and with that the benefits.

Cheers,
Magnus

On 04/01/2018 07:04 PM, Joseph Gray wrote:

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and follow the instructions there.

Bob,

If it was a glass of good bourbon, I'd take you up on that offer :-)

The Broadcom chipsets are touted as being specifically for phones. Whether
we'll be able to buy stand alone modules, I don't know. The uBlox chipsets
have in that past been widely available at rational prices. Hopefully the
new "9" series will be, also. As for the ST Micro, I haven't a clue, but
considering how their microcontrollers are so widely available from China,
who knows what will happen.

Joe Gray
W5JG

On Sun, Apr 1, 2018 at 9:37 PM, Bob kb8tq kb8tq@n1k.org wrote:

Tom,

Yes, that was my take on this as well. With easily available sub-meter
position fixes, I believe that even more uses will be found for this
technology.

With the Broadcom chipsets going into phones, Google Maps will no longer
tell you to take the highway ramp, when you are already on the highway :-)

Just remember to turn off your phone and wear your tin foil hat, when you
don't want "the man" knowing where you are :-)

Joe Gray
W5JG

On Sun, Apr 1, 2018 at 9:53 PM, Tom Knox actast@hotmail.com wrote:

Hi Tom,

It is indeed a benefit to use the different constellations. However, I
want to make one point regarding propagation delay. As you observe one
satellite in 2 frequencies, you can use the fact that the ionospheric
shift at one frequency depends on the frequency and the TEC of that
path. As you now observe on two frequencies, you can now on the
difference between the measures estimate how much the difference of
frequency picked up at TEC, thus one can separate out the TEC effect. By
estimating TEX from those observations, the ionspheric effect can be
removed from both observations. If you try to do this with another
constellation, you add a number of complicating factors and loose
precision as you do so. Can you observe the same satellite in three
frequencies, you can build a more accurate estimation and compensation.
Also, you an loose one of the signals and still be able to perform the
processing. One should be prepared to do L1 only, L2C only, L5 only, L1
& L2C, L1 & L5, L2C & L5 and finally L1 & L2C & L5.

Cheers,
Magnus

On 04/01/2018 11:53 PM, Tom Knox wrote:

I think Bob is right and knows what he is talking about.  Example Furuno GT-87, how many years have I known about it and tried to buy some, just recently became available.
Bert Kehren
 
In a message dated 4/1/2018 10:52:50 PM Eastern Standard Time, jgray@zianet.com writes:

 
Bob,

If it was a glass of good bourbon, I'd take you up on that offer :-)

The Broadcom chipsets are touted as being specifically for phones. Whether
we'll be able to buy stand alone modules, I don't know. The uBlox chipsets
have in that past been widely available at rational prices. Hopefully the
new "9" series will be, also. As for the ST Micro, I haven't a clue, but
considering how their microcontrollers are so widely available from China,
who knows what will happen.

Joe Gray
W5JG

On Sun, Apr 1, 2018 at 9:37 PM, Bob kb8tq kb8tq@n1k.org wrote:

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.