Radar systems
US4109248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1975 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Aug 27, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2013/466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A secondary radar system for establishing the position and identity of aircraft etc. on airfields, particularly for controlling their ground movements during bad visibility, comprises a pair of spaced aerials each arranged to successively transmit a particular one of two interrogate pulses, the time relationship between the two pulses being varied such that a predetermined time relationship between the two interrogate pulses obtains at varying distances from said spaced aerials to afford selective interrogation of a transponder receiving the two interrogate pulses, and a third aerial spaced from the pair of spaced aerials for transmitting a further pulse in a second predetermined time relationship with one of the interrogate pulses whereby a selected transponder or transponders receiving said two interrogation pulses in said predetermined time relationship is caused to be suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.