| US 7,612,705 B2 | ||
| Mode S radar | ||
| Masami Ino, Kawasaki (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jan. 16, 2009, as Appl. No. 12/354,924. | ||
| Application 12/354924 is a division of application No. 11/764978, filed on Jun. 19, 2007, granted, now 7,501,977. | ||
| Claims priority of application No. 2006-173462 (JP), filed on Jun. 23, 2006; and application No. 2007-121013 (JP), filed on May 01, 2007. | ||
| Prior Publication US 2009/0121913 A1, May 14, 2009 | ||
| Int. Cl. G01S 13/91 (2006.01); G01S 13/74 (2006.01); G01S 13/93 (2006.01) | ||
| U.S. Cl. 342—37 [342/38; 342/32] | 2 Claims |
| 1. A Mode S radar which specifies an aircraft by transmitting interrogations to a Mode S transponder installed in an aircraft,
by receiving replies to the interrogations, and by then decoding the contents of the received replies, the Mode S radar comprising:
acquisition means, which transmits a Mode S only all-call interrogation, and which thereby accomplishes an initial acquisition
of an aircraft equipped with a Mode S transponder;
first obtainment means, which transmits UF=4 and UF=5 as Mode S selective interrogations to the Mode-S-transponder-equipped aircraft with the initial acquisition having been accomplished
by the acquisition means, and which thereby obtains a Mode A code as a DF=5 reply from the Mode-S-transponder-equipped aircraft;
scan counting means, which counts the number of scans performed on the Mode-S-transponder-equipped aircraft after the initial
acquisition;
second obtainment means, which transmits UF=4 and UF=5, as Mode S selective interrogations, to the Mode-S-transponder-equipped aircraft every time the number of scans counted by
the scan counting means reaches a preset optimal number of scans after a Mode A code is obtained by the first obtainment means,
and which thereby re-obtains a Mode A code as a new DF=5 reply from the Mode-S-transponder-equipped aircraft; and
generation means, which generates a detection report on the aircraft.
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