Communications: directive radio wave systems and devices (e.g. – Aircraft collision avoidance system – With transponder
Reexamination Certificate
2005-05-10
2009-08-04
Sotomayor, John B (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Aircraft collision avoidance system
With transponder
C342S032000, C342S037000
Reexamination Certificate
active
07570194
ABSTRACT:
A system able to locate and identify aircraft and vehicles based on the reception and processing, with novel means and methods, of signals emitted by the transponder of the secondary surveillance radar, shortly SSR. The system has a number of fixed stations distributed in the area of interest, e.g. in the airport area; any signal (the well known SSR reply/squitter) transmitted by the on-board transponder is received by four or more stations and the measurement of three or more differences of times of arrival (TOA) permits the reconstruction of the position of the transponder in spite of the fact that the transmission time is unknown. Suitable algorithms based on optimal estimation enhance both the accuracy of TOA measurements and the accuracy of the reconstructed position. The effects of possible overlapping of signal in time are avoided or mitigated by multiple source separation techniques based on least squares algebraic processing.
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patent: 7187327 (2007-03-01), Coluzzi et al.
patent: 2004/0233095 (2004-11-01), Galati et al.
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patent: 98/05977 (1998-02-01), None
International Search Report for PCT/IB2005/051519 dated Sep. 27, 2005.
Nixon & Vanderhye PC
Sotomayor John B
Università Degli Studi Di Roma “Tor Vergata”
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