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| Number | Title | Issue Date |
| 7009560 | Adaptive variable true time delay beam-forming system and method System and method for signal processing and beam forming. A system for processing signals includes a first phase shifter, a second phase shifter, a first variable time delay system, and a second variable time delay system. Additionally, the system includes a first s... | 03/07/2006 |
| 6907270 | Method and apparatus for reduced rank channel estimation in a communications system A method and apparatus for estimating a communication channel in a wireless communication system having multiple transmitter antennas using reduced rank estimation. The method exploits redundant and/or a priori knowledge within a system to simplify the estimation ca... | 06/14/2005 |
| 6111543 | Method and device for analysing radio navigation signals A beacon transmission signal comprises at least one carrier (C+SB) including sidebands (SB) and one sideband only signal (SBO), said carrier and said signal being in any mutual phase relationship. The method of the invention includes the steps of demodula... | 08/29/2000 |
| 6097338 | Instrument landing system glide path transmitter device A glide path transmitter for an instrument landing system. The transmitter includes several antenna radiators by way of which high frequency signals containing various low frequency modulated carrier and side band components are radiated. The components o... | 08/01/2000 |
| 5689273 | Aircraft surface navigation system A surface guidance system for guiding aircraft equipped with Instrument Landing Systems along taxiways which utilizes two inductive loops (14,16) installed around the right half and the left half of the taxiways. Audio amplifiers (18,20) drive one loop (1... | 11/18/1997 |
| 4990921 | Multi-mode microwave landing system A guidance system for landing an aircraft is described which uses a source of signals identifiable with the aircraft and a ground station which is linked to the aircraft. Specifically, the ground station includes a receiver which is connected to one or mo... | 02/05/1991 |
| 4912480 | Offset phase-center antenna for aircraft landing system An azimuthal scanning antenna for an aircraft landing system is formed of a set of vertically disposed columnar radiators arranged side-by-side in a horizontal array. The columnar radiators are tilted back in pitch 7.5°. Individual ones of the radiators ... | 03/27/1990 |
| 4677442 | Microwave landing system with &#b1;90 degree azimuth clearance guidance and 360 degree data coverage A microwave landing system incorporates a set of antennas for the sequential transmission of guidance signals through a sequence of directions to enable the reception and decoding of the signals by an airborne receiver. Circuitry is included for the retra... | 06/30/1987 |
| 4617569 | Process for increasing the range and particularly the protection against jamming of an MLS landing system and means for performing this process A process and means for increasing the range and the protection against jamming of a MLS system. It consists of transmitting a supplementary or reinforced preamble for each MLS function or group of MLS functions, via a scanning antenna used for the azimut... | 10/14/1986 |
| 4559538 | Microwave landing system with protection against jamming In a microwave landing system or MLS, the bearing and/or elevation angular messages are in two parts a preamble transmitted by a sector antenna and a specific message transmitted by an electronic scan or scanning beam antenna. As the gain of the sector an... | 12/17/1985 |
| 4232316 | Aircraft landing-guiding apparatus An aircraft landing-guiding apparatus having an antenna system constituted by a plurality of antenna elements arranged in a line and intersecting the course of a runway substantially at right angles at the lengthwise center of the runway. Phases of sideba... | 11/04/1980 |
| 4196346 | Laser guided blind landing system for aircraft A laser guided blind landing system for aircraft comprising in combination: a longitudinally extending runway, a plurality of laser beam generators mounted in longitudinally spaced alignment therewith at one end thereof, said generators being positioned t... | 04/01/1980 |
| 4167739 | Instrument landing system glidepath antenna array and drive therefor An instrument landing system (ILS) glidepath antenna array and drive therefor which provides for lower susceptibility to above-ground interference and higher stability than the known M-array system. The antenna array also provides for a shorter image grou... | 09/11/1979 |
| 4164743 | Drive arrangement for an instrument landing system glidepath antenna A drive arrangement for an instrument landing system (ILS) glidepath antenna array, the drive system providing for a shorter image ground than is required by the known null reference, sideband reference or M-array systems. The drive system is applicable t... | 08/14/1979 |
| 4037173 | Multiple carrier modulation synthesis Two carriers are gated on and off in an alternating sequence. The same group of different digital sample point values signifying various modulation levels required for each carrier at successive points in time are read out in timed sequence and applied to... | 07/19/1977 |
| 3982249 | Microwave radiation method and apparatus with a combined diffraction edge and radiation screen In a directional microwave signal radiation system, low angle radiation problems are dealt with by inserting a combined diffraction edge and radiation screen in the lower portion of the radiation field to provide a diffraction pattern of radiation at low ... | 09/21/1976 |
| 3965443 | Electronic modulator for guidance systems An amplitude modulation system having a modulation control circuit including a limiter for the modulation signal, a detector for deriving a DC contr0l signal from the unmodulated carrier, a first adjustable network connected to the detector to produce a s... | 06/22/1976 |
| 3964067 | Glide path signal transmission system An aircraft glide path signal transmission system is provided with an antenna comprising two overlapping arrays which are in turn constituted by a number of antenna elements disposed in a vertical direction, with some of the elements of each array common ... | 06/15/1976 |
| 3950754 | Method of transmitting glide slope navigation signals for aircraft A multiple element antenna array provides a separate beam of carrier signal from each element in a pattern of beams spaced at different angles above the horizon. The array is adjusted upwardly to avoid obstructions on the horizon, and a program of modulat... | 04/13/1976 |
