[time-nuts] Aircraft ping timing

J. Forster jfor at quikus.com
Wed Mar 19 20:47:17 EDT 2014

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.



> My question was on what would be the expected accuracy of the circle's
> radius.
> Antonio I8IOV
>>----Messaggio originale----
>>Da: bill at 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 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 goes on.
>>Bill Hawkins
>>-----Original Message-----
>>From: iovane at inwind.it
>>Sent: Wednesday, March 19, 2014 6:46 PM
>>Those who say the missing aircraft should be searched along the two
>>corridors, what measurement are they relying on? I think it is a one-way
>>measurement of time-stamped pings, which implies good synchronization of
>>clocks between a geosynchronous satellite and a moving aircraft. Antonio
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