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| Number | Title | Issue Date |
| 5659319 | Method and apparatus for operating a surface detection surveillance radar using frequency agile pulse transmissions In accordance with the principles of the invention, a surveillance radar is provided with a rotating, frequency squinting, end-fed slotted array antenna, which is caused to transmit a plurality of different carrier frequency pulses for successively illumi... | 08/19/1997 |
| 5528244 | Processing for mode S signals suffering multipath distortion A communication system for receiving aircraft reply squits (transmissions) normally used in a radar beacon system for surveilling aircraft in a given geographic area. The communication system includes a plurality of omnidirectional receivers, each receive... | 06/18/1996 |
| 5424746 | Method and system for monitoring vehicles System for tracking a vehicle equipped with a transponder which emits a first reply signal containing data identifying the vehicle in response to a first interrogation signal and emits a second reply signal containing data specifying the altitude of the v... | 06/13/1995 |
| 5418535 | Mixed radar/graphics indicator A radar indicator comprising a source of radar image signals having a first (r,θ) format and a digital scan converter responsive to the radar image signals for converting the radar image signals from the first format to digital radar image signals having... | 05/23/1995 |
| 5262784 | System for monitoring aircraft position A system for locating and identifying aircraft while on an airport. Each aircraft has an IFF transponder which is interrogated from on board the aircraft to produce replies at a slower rate than normal interrogation rates. A plurality of receiving station... | 11/16/1993 |
| 5220329 | Monopulse reply extractor for SSR navigation systems An SSR reply decoding system for separating pulse codes of a series of closely-spaced or overlapping SSR replies is disclosed. A delay line is connected to receive pulses representing the leading edge of each SSR reply code pulse. The delay line has a len... | 06/15/1993 |
| 5144315 | System for accurately monitoring aircraft position during training exercises Tracking system for monitoring aircraft position during simulated training exercises. Standard IFF transponders on the aircraft are periodically enabled by a squitter transmitter mounted on the aircraft. On the ground a plurality of receiving stations are... | 09/01/1992 |
