On Sat, 22 Mar 2014 07:40:27 -
David J Taylor david-tay...@blueyonder.co.uk wrote:
From: Hal Murray
There is a newer system getting phased in: ADS-B
http://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast
The plane broadcasts it's position and velocity every second.
On Sat, 22 Mar 2014 06:58:22 -0700 (PDT)
J. Forster j...@quikus.com wrote:
I'm not so sure it is worth much as parts, except possibly on the
black market. I believe the aircraft industry is big on tracking
every part, cradle to grave. After all an under spec bolt can cause a
very expensive
In message 20140323014515.0fffd232@linux-wh01, nuts writes:
These salvage yards
knew the content of each bird down to a science, and thus know when to
start the process.
We had an interesting event in Denmark related to that: Somebody hadn't
heard about Mag-Thor, and tried to drive a truckload
From: nuts
Note that the ADS-B mentioned is just a fancy version of the
transponder that was turned off.
I ran into your R Pi page about halfway in the process of doing my
Beaglebone Black RTLSDR page. I have RTLSDR and dump1090 running on
Angstrom Linux. I bought the GPS you suggested and will
There is a newer system getting phased in: ADS-B
For info MH370 did transmit ADS-B signals up to 17:21 UTC on 7 March when it
seems it was either switched off or disabled. You can still see the track
it took up to this time using the playback facility on Flight Radar 24 by
say starting
Da: rmon...@bigpond.net.au
Data: 23/03/2014 10.58
For info MH370 did transmit ADS-B signals up to 17:21 UTC on 7 March when it
seems it was either switched off or disabled. You can still see the track
it took up to this time using the playback facility on Flight Radar 24 by
say starting at
On Sun, Mar 23, 2014 at 3:37 AM, nuts n...@lazygranch.com wrote:
Note that the ADS-B mentioned is just a fancy version of the
transponder that was turned off.
I guess it depends on your concept of what a transponder does. Yes, ADS-B
does transmit in the same band as the standard transponder
FR24 got a bit picky with their latest generation receiver since so
many of the first generation units walked. What they have been doing
lately is giving them to flight schools, which are a bit more
responsible than your average schmuck.
You can monitor any of these decoders with
Hi
While you would *think* that LTE and PCS signals would be locked to “something
good”, that’s not always the case. If you decide to use something like this for
timing, it’s best to check things out carefully. Symmetricom learned this the
hard way on one of their boxes ….
Bob
On Mar 23,
jleik...@leikhim.com said:
In retrospect it is kind of crazy that fleet owners will put tracking
devices on $100K semi trucks and cranes yet $100 million aircraft have to
rely upon 60 year old technology (Transponders) and ACARS to keep track of
them. I don't question the utility of TCAS and
From: Hal Murray
There is a newer system getting phased in: ADS-B
http://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast
The plane broadcasts it's position and velocity every second.
The SDR folks are having fun with it. With one of the USB TV receiver
gizmos
and a
In message 532d1009.6040...@leikhim.com, Joe Leikhim writes:
In retrospect it is kind of crazy that fleet owners will put
tracking devices on $100K semi trucks and cranes yet $100 million
aircraft have to rely upon 60 year old technology (Transponders)
and ACARS to keep track of them.
Pilots
On 3/21/14 8:52 PM, nuts wrote:
On Thu, 20 Mar 2014 14:42:42 -0400
Joe Leikhim jleik...@leikhim.com wrote:
I just red somewhere that the last ping was the only one recorded
by Inmarsat system, Pings up to that point were presumed to occur due
to known reporting intervals. So there is no track.
On Fri, Mar 21, 2014 at 11:22 PM, Joe Leikhim jleik...@leikhim.com wrote:
In retrospect it is kind of crazy that fleet owners will put tracking
devices on $100K semi trucks and cranes yet $100 million aircraft have to
rely upon 60 year old technology (Transponders) and ACARS to keep track of
On 22/03/14 09:01, Poul-Henning Kamp wrote:
In message 532d1009.6040...@leikhim.com, Joe Leikhim writes:
In retrospect it is kind of crazy that fleet owners will put
tracking devices on $100K semi trucks and cranes yet $100 million
aircraft have to rely upon 60 year old technology
I'm not so sure it is worth much as parts, except possibly on the black
market. I believe the aircraft industry is big on tracking every part,
cradle to grave. After all an under spec bolt can cause a very expensive
crash.
YMMV,
-John
==
In retrospect it is kind of crazy
Actually traceability of parts for maintenance has nothing to do with unions
and national security. It has everything to do with failure analysis.
If a part fails it's entire path from manufacturer to maintanance and repair
shops can be traced so if a part starts experiencing failures at Sn
Can you imagine how much an aircraft like that is worth in spare parts
alone?
It is worth more as scrap metal.
There is no market for untraced spare parts for large passenger jets.
I was just going to say the same thing. Selling parts from a stolen
777 is like being an art thieve who just
On 22/03/14 21:19, Chris Albertson wrote:
Can you imagine how much an aircraft like that is worth in spare parts alone?
It is worth more as scrap metal.
There is no market for untraced spare parts for large passenger jets.
I was just going to say the same thing. Selling parts from a stolen
Hi Brian:
MH370 had both ACARS and ADS-B, they have not been of any help.
ACARS can send it's data using (in order) VHF, Inmarsat, HF.
The problem is that ACARS quit sending information.
MH370 did not have a contract wtih Inmarsat.
ADS-B is built using W.W.II IFF technology (1090/1030 MHz, i.e.
In message 532e01ee.3040...@pacific.net, Brooke Clarke writes:
There are two scenarios regarding MH370: [...]
Three: 3) Somebody stole the plane for some reason.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer |
At this time, the most likely story was written by a pilot and appeared
in Wired magazine.
Google MH370 smoke and look for the Wired reference.
Bill Hawkins
-Original Message-
From: Poul-Henning Kamp
Sent: Saturday, March 22, 2014 5:44 PM
In message 532e01ee.3040...@pacific.net, Brooke
On Thu, 20 Mar 2014 14:42:42 -0400
Joe Leikhim jleik...@leikhim.com wrote:
I just red somewhere that the last ping was the only one recorded
by Inmarsat system, Pings up to that point were presumed to occur due
to known reporting intervals. So there is no track.
The Inmarsat data is a red
In retrospect it is kind of crazy that fleet owners will put tracking devices
on $100K semi trucks and cranes yet $100 million aircraft have to rely upon 60
year old technology (Transponders) and ACARS to keep track of them. I don't
question the utility of TCAS and Transponders, it is just the
On Wed, Mar 19, 2014 at 09:28:38PM -0700, nuts wrote:
A lot of these satellites have footprints for each antenna. I don't
know if the footprints are narrow enough to track a plane.
I do believe there is an time offset for each aircraft sent on
the forward control channel from the ground
In message 279331507.5734621395275538874.JavaMail.actor@webmail5, iovane@inw
ind.it writes:
My question was on what would be the expected accuracy of the circle's radius.
Projected onto the surface of the earth, the uncertainty leaves a band
approx 740km wide.
--
Poul-Henning Kamp | UNIX
On 3/20/14 12:07 AM, Poul-Henning Kamp wrote:
In message 279331507.5734621395275538874.JavaMail.actor@webmail5, iovane@inw
ind.it writes:
My question was on what would be the expected accuracy of the circle's radius.
Projected onto the surface of the earth, the uncertainty leaves a band
Would think they have many other aircraft with known position stationary or
moving with location known to help improve the estimate.
Stanley
- Original Message -
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Thursday, March 20, 2014 8:05 AM
Subject: Re: [time-nuts
In message 40280C39FE7D43C79313A1755BCAF58D@StanleyPC, Stanley writes:
Would think they have many other aircraft with known position stationary or
moving with location known to help improve the estimate.
They might have been able to do that while the plane responded, but
now that the plane is
In message 532ae780.4020...@earthlink.net, Jim Lux writes:
On 3/20/14 12:07 AM, Poul-Henning Kamp wrote:
Is there a document that describes the system somewhere? I've seen
various descriptions of what's going on. Do they use timing or amplitude
measurements?
It is a timing measurement and
On 3/20/14 8:53 AM, Poul-Henning Kamp wrote:
In message 40280C39FE7D43C79313A1755BCAF58D@StanleyPC, Stanley writes:
Would think they have many other aircraft with known position stationary or
moving with location known to help improve the estimate.
They might have been able to do that while
Subject: Re: [time-nuts] Aircraft ping timing
On 3/20/14 8:53 AM, Poul-Henning Kamp wrote:
In message 40280C39FE7D43C79313A1755BCAF58D@StanleyPC, Stanley
writes:
Would think they have many other aircraft with known position stationary
or
moving with location known to help improve the estimate
In message B55E2883CD3E43878AE5CB77C259E572@StanleyPC, Stanley writes:
Missing plane this ping was not lost why would others be lost ? This ping
was retrieved long after (days) it was received why would it be the only one ?
The point is that they might have been able to do more precise pings
in
I just red somewhere that the last ping was the only one recorded by
Inmarsat system, Pings up to that point were presumed to occur due to
known reporting intervals. So there is no track.
The Inmarsat data is a red herring. The plane could have ditched into
the water 85 minutes after the
They only got one ping from INMARSAT at 64E above the Indian Ocean.
There was no other ping to triangulate the position.
One ping projects a circle on the Earth. The maximum flying range of the
plane determined the ends of the NE and SE arcs of that circle.
The news only gets stranger as time
My question was on what would be the expected accuracy of the circle's radius.
Antonio I8IOV
Messaggio originale
Da: b...@iaxs.net
Data: 20/03/2014 1.21
They only got one ping from INMARSAT at 64E above the Indian Ocean.
There was no other ping to triangulate the position.
One ping
It depends on how accurately the bird can measure the round-trip time:
1 us = ca 500'
10 us = ca 1 mile
100us = ca 10 miles
1 ms = ca 100 miles
The arcs are loci of constant round trip time, projected on the globe.
-John
===
My question was on what would be the expected
Messaggio originale
Da: j...@quikus.com
Data: 20/03/2014 1.47
It depends on how accurately the bird can measure the round-trip time:
1 us = ca 500'
10 us = ca 1 mile
100us = ca 10 miles
1 ms = ca 100 miles
The arcs are loci of constant round trip time, projected on the globe.
This is
Hi Antonio:
It's my understanding that the satellite sends a ping to each aircraft in it's low gain antenna pattern once every hour
by aircraft ID number.
The aircraft replies with a very short data packet that's time stamped (but without any location or other info other
than the ID).
The
On 3/19/14 5:21 PM, Bill Hawkins wrote:
They only got one ping from INMARSAT at 64E above the Indian Ocean.
There was no other ping to triangulate the position.
One ping projects a circle on the Earth. The maximum flying range of the
plane determined the ends of the NE and SE arcs of that
A lot of these satellites have footprints for each antenna. I don't
know if the footprints are narrow enough to track a plane.
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