Perhaps. My multiple flight data suggests good lock on uBlox below 500 m/s. At
the ITAR limit a uBlox simply stops reporting.
Nada. Nothing.
As soon as velocity. drops below that limit it reports again seamlessly.
I do not know the limits of the uBlox algorithm but suspect in excess of ITAR
limits.
Factory tells me that it will report above spec limit of 50 km though with
diminished accuracy.
My theory is hardware just fine up to about 10g.
Software filtering.
Piksi interesting less for hardware but for open source software.
K
Ken Biba
Novarum, Inc.
415-577-5496
On Aug 2, 2015, at 7:38 PM, Paul Breed <paul@xxxxxxxxxx> wrote:
Needs to be 1/2 PPM so a really good clock...
On Sun, Aug 2, 2015 at 6:54 PM, Ken Biba <kenbiba@xxxxxx> wrote:
Perhaps. Below 500 m/s I simply do not see that.
Ken Biba
Novarum, Inc.
415-577-5496
On Aug 2, 2015, at 6:52 PM, Henrik Schultz <henrik@xxxxxx> wrote:
Doppler shift kills that idea - rocket is travelling away from frequency
reference at high velocity. Some are using that for determining speed, so
it is noticable.
/H
------ Original Message ------
From: "George Herbert" <george.herbert@xxxxxxxxx>
To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
Sent: 8/2/2015 6:23:42 PM
Subject: [AR] Re: GPS again....
Out of curiosity... Has anyone considered a different frequency source
while under acceleration?
Freerunning PLL? Have a crystal on the ground transmitting the frequency?
...
George William Herbert
Sent from my iPhone