Explanation

[tfede]

Hi,


what is the meaning of the figures behind the "C-" when a C traffic is received in proximity ?
(see pictures below)


Federico

[Admin]

Hi Federico

Mode-C is very difficult to handle, each time a new Mode-C response is received, a machine learning algorithm attempts to determine if this is a previously received response. Bear in mind the only data we have available for a Mode-C response is an altitude, a signal strength and a time of arrival
This data is combined to see how likely this is to an existing aircraft in our database, terms of its delta change of alt/strength/time, this algorithm is also used to determine that it is not an alias to an existing Mode-S or ADS-B transponder response.
If the machine learning algorithm determines it is a new aircraft, a counter is incremented and this new value is assigned to this response, and prefixed with C-, so the figure you see is a hexadecimal counter which goes from C-0001 to C-FFFF

That is a very simple explanation of an algorithm which is incredibly complicated 

Thx
Lee

[mariko]

Thanks for you promply answer.
And what kind of positional traffic shows the tag #UNDEF# ?

[Admin]

PilotAware->Configure->Flight-ID : (default value = UNDEF)

this should be updated using your tail reg or flight ID

thx
Lee

[mariko]

PilotAware->Configure->Flight-ID : (default value = UNDEF)

this should be updated using your tail reg or flight ID

thx
Lee

So, if i see an #UNDEF#, it means it is a Rosetta and not a ADS-B?

[exfirepro]

Mariko,

A Reg ID bracketed by ‘#’ marks at both ends indicates that the aircraft is running PilotAware and has the same ‘Group ID’ as yourself (normally the ‘default’ PAWGRP) set in ‘Configure’.

This feature is designed to allow pilots - for example on a flyout - to easily distinguish aircraft in their own group amongst all those on screen by all setting an agreed ‘Group ID’ e.g. EOSM for East of Scotland Microlights prior to takeoff.

See Page 13 in the current User Manual on www.pilotaware.com/documents

Regards

Peter