Radar selective interrogation system
US4137531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1977 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | May 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An aircraft ground movement monitoring system is provided similar to that described in co-pending U.S. patent application Ser. No. 608,214, now U.S. Pat. No. 4,109,248, that makes use of an aircraft's existing SSR transponder in a hyperbolic selective interrogation technique to monitor an aircraft's position on an airfield in which, in order to overcome the problems particularly involving spurious mode C (height) interrogations that arise in long base-line systems, it is arranged that transponders that would be spuriously interrogated are interrogated first and that the required transponder is interrogated before the already interrogated transponders have finished replying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.