Empathy List Archives

D

Don

Mon, Nov 13, 2017 4:35 AM

I read where the first GPS III satellite had finally been approved for
flight.

The report said they will provide three times better location accuracy
than current GPS.

Will "better" onboard clocks help contribute to this improvement? How
are they "better"?

Can we expect enhanced timing accuracy from the timing receivers we use
in our homemade GPSDO's?.

-Don
N5CID

I read where the first GPS III satellite had finally been approved for flight. The report said they will provide three times better location accuracy than current GPS. Will "better" onboard clocks help contribute to this improvement? How are they "better"? Can we expect enhanced timing accuracy from the timing receivers we use in our homemade GPSDO's?. -Don N5CID

MD

Magnus Danielson

Mon, Nov 13, 2017 6:22 AM

Hi Don,

Hardly. As long as you do GPS L1 C/A code only, chanses you get any
useful improvement isn't all that great. SBAS may help you some thought.

Cheers,
Magnus

On 11/13/2017 05:35 AM, Don wrote:

I read where the first GPS III satellite had finally been approved for
flight.

The report said they will provide three times better location accuracy
than current GPS.

Will "better" onboard clocks help contribute to this improvement? How
are they "better"?

Can we expect enhanced timing accuracy from the timing receivers we use
in our homemade GPSDO's?.

-Don
N5CID

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.

Hi Don, Hardly. As long as you do GPS L1 C/A code only, chanses you get any useful improvement isn't all that great. SBAS may help you some thought. Cheers, Magnus On 11/13/2017 05:35 AM, Don wrote: > > I read where the first GPS III satellite had finally been approved for > flight. > > > The report said they will provide three times better location accuracy > than current GPS. > > Will "better" onboard clocks help contribute to this improvement? How > are they "better"? > > Can we expect enhanced timing accuracy from the timing receivers we use > in our homemade GPSDO's?. > > -Don > N5CID > _______________________________________________ > 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. >

J

jimlux

Mon, Nov 13, 2017 1:23 PM

On 11/12/17 10:22 PM, Magnus Danielson wrote:

Hi Don,

Hardly. As long as you do GPS L1 C/A code only, chanses you get any
useful improvement isn't all that great. SBAS may help you some thought.

the new L1C code plus increase in radiated power might help

On 11/12/17 10:22 PM, Magnus Danielson wrote: > Hi Don, > > Hardly. As long as you do GPS L1 C/A code only, chanses you get any > useful improvement isn't all that great. SBAS may help you some thought. > the new L1C code plus increase in radiated power might help

BC

Bob Camp

Mon, Nov 13, 2017 1:56 PM

Hi

There are papers from ION and other places detailing testing on the
new(er) clocks. They do have quite good ADEV performance. If they
start showing up on eBay, expect a bidding war ….

The most useful thing for an L1 user is getting the added bits into the
datastream for the epoch. That (plus ground firmware changes) will
get rid of our roll over issues. Not much help for older product though.

Bob

On Nov 12, 2017, at 11:35 PM, Don dlewis6767@austin.rr.com wrote:

I read where the first GPS III satellite had finally been approved for
flight.

The report said they will provide three times better location accuracy
than current GPS.

Will "better" onboard clocks help contribute to this improvement? How
are they "better"?

Can we expect enhanced timing accuracy from the timing receivers we use
in our homemade GPSDO's?.

-Don
N5CID

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.

Hi There are papers from ION and other places detailing testing on the new(er) clocks. They do have quite good ADEV performance. If they start showing up on eBay, expect a bidding war …. The most useful thing for an L1 user is getting the added bits into the datastream for the epoch. That (plus ground firmware changes) will get rid of our roll over issues. Not much help for older product though. Bob > On Nov 12, 2017, at 11:35 PM, Don <dlewis6767@austin.rr.com> wrote: > > > I read where the first GPS III satellite had finally been approved for > flight. > > > The report said they will provide three times better location accuracy > than current GPS. > > Will "better" onboard clocks help contribute to this improvement? How > are they "better"? > > Can we expect enhanced timing accuracy from the timing receivers we use > in our homemade GPSDO's?. > > -Don > N5CID > _______________________________________________ > 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.

MD

Magnus Danielson

Mon, Nov 13, 2017 4:56 PM

Hi,

On 11/13/2017 02:23 PM, jimlux wrote:

On 11/12/17 10:22 PM, Magnus Danielson wrote:

Hi Don,

Hardly. As long as you do GPS L1 C/A code only, chanses you get any
useful improvement isn't all that great. SBAS may help you some thought.

the new L1C code plus increase in radiated power might help

The L1C code is something different than L1 C/A, so it help to some degree.

Better handling of ionospheric delay than standard L1 C/A code tracking
do would do quite a bit more.

L2C and L5 would be useful. Doing the same for other GNSS too.

As for increased radiated power, we already have that. It's been a
resident capability of Block IIR, or at least later in the series, and
was turned on for a test. The impact have been somewhat better precision
but not any bad issues that I've heard of.

Cheers,
Magnus

Hi, On 11/13/2017 02:23 PM, jimlux wrote: > On 11/12/17 10:22 PM, Magnus Danielson wrote: >> Hi Don, >> >> Hardly. As long as you do GPS L1 C/A code only, chanses you get any >> useful improvement isn't all that great. SBAS may help you some thought. >> > > > the new L1C code plus increase in radiated power might help The L1C code is something different than L1 C/A, so it help to some degree. Better handling of ionospheric delay than standard L1 C/A code tracking do would do quite a bit more. L2C and L5 would be useful. Doing the same for other GNSS too. As for increased radiated power, we already have that. It's been a resident capability of Block IIR, or at least later in the series, and was turned on for a test. The impact have been somewhat better precision but not any bad issues that I've heard of. Cheers, Magnus

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GPS III