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| Number | Title | Issue Date |
| 7994964 | Method for determining the position, notably in terms of elevation, of a target flying at very low altitude The present invention relates to a method for determining the position notably the elevation of a target flying at very low altitude. An electromagnetic detection system extracts the measurement of the elevation on the basis of the amplitude of the interference sign... | 08/09/2011 |
| 7414566 | System for monitoring airport area A system is for recognizing obstructions and monitoring movements on or above an airport area (1) with sensors (2, 3, 4). A sensor (2) is a radar device having a plurality of antenna elements (12, 14), which are affixed to a curved surfac... | 08/19/2008 |
| 7301497 | Stereo display for position sensing systems A method for display of radar data includes performing a first radar scan to obtain, for at least one object (24), a first range reading, a first azimuth reading, and a first altitude reading. A second radar scan is then performed to obtain, for the at least ... | 11/27/2007 |
| 6711478 | Receiver-autonomous vertical integrity monitoring A system and method for determining the vertical integrity of an altitude component of an aircraft navigational signal through the use of a receiver-autonomous vertical integrity monitoring (RAVIM) algorithm. The system and methods also provide timely warning to veh... | 03/23/2004 |
| 6604028 | Vertical motion detector for air traffic control A process and apparatus are disclosed for estimating changes in the vertical mode of flight of an aircraft. The process and apparatus utilize a vertical motion detection method (VMD) and a modified altitude post processor logic to reduce the time delay fo... | 08/05/2003 |
| 6600442 | Precision approach radar system having computer generated pilot instructions A computer generated pilot instruction system for providing spatial information to a pilot corresponding to the difference between the actual landing fight path and optimal landing flight path.... | 07/29/2003 |
| 6359583 | Ground based millimeter wave imaging system System and methods for a ground based millimeter wave imaging system that provides real-time millimeter wave images of an airport to one or more aircraft from one or more ground stations (18). The system includes at least one millimeter wave transceiver (... | 03/19/2002 |
| 6266583 | System and method for improving the accuracy of pressure altitude determinations in an inertial navigation system A system and method for improving the accuracy of altitude determinations in an inertial navigation system. Pressure measurements available to the inertial navigation system are used to initially calculate an estimated pressure altitude using the standard... | 07/24/2001 |
| 6094607 | 3D AIME™ aircraft navigation The apparatus of the present invention uses radar altimeter measurements and stored terrain altitude profiles to provide pre-filtered observations to a Kalman filter for estimating barometric offset at the airport runway, and barometric scale factor for o... | 07/25/2000 |
| 6085147 | System for determination of optimal travel path in a multidimensional space The present automated vehicle travel path determination system which computes a travel path for a vehicle from an origination point to a destination point based on the operating characteristics of the vehicle as well as phenomena extant in the multidimens... | 07/04/2000 |
| 5940035 | Method for calibrating aircraft altitude sensors A method for calibrating a pressure-sensing altitude sensor of an aircraft while the aircraft is in flight. The method includes the steps of obtaining a set of reference atmospheric pressures as a function of height above a base station by affixing a refe... | 08/17/1999 |
| 5703591 | Aircraft N-number control system An aircraft N-number control system includes a receiver for receiving aircraft identification information signals representing alphanumeric characters corresponding to an aircraft. A microprocessor operating in accordance with stored programming instructi... | 12/30/1997 |
| 5463398 | Method and apparatus for multiple reply rejection when decoding transponder replay signals Apparatus for rejecting multipath reply signals received from a target transponder within a selectable time period, comprising: a top antenna and a bottom antenna to detect reply signals; means for determining an altitude code associated with each reply s... | 10/31/1995 |
| 5402116 | Atmospheric pressure calibration systems and methods Systems are provided to derive a value of barometric pressure at a defined location in the atmosphere at a computed geometric height. By using the geometric height in a look-up table of pressure/height values representing a standard atmospheric profile, a... | 03/28/1995 |
| 5363109 | Method of correcting measurement errors caused by clock deviations in a secondary radar system Conventional secondary radar systems use mechanically rotating antennas to radiate a concentrated beam that rotates in a horizontal plane. Data exchange between ground stations and airborne transponders can only take place if the aircraft is struck by the... | 11/08/1994 |
| 5321406 | Method of track merging in an aircraft tracking system A method of processing a plurality of tracks representative of one or more target aircraft in a vicinity of a surveillance aircraft, where each track is generated in response to target reply signals provided by the target aircraft in response to interroga... | 06/14/1994 |
| 5252978 | Collision warning system A collision warning signal for at least one vehicle is provided by transmitting from the surface of the earth a radio signal, receiving at the surface of the earth, a radio signal returned by a vehicle in response to the transmitted radio signal, determin... | 10/12/1993 |
| 5089822 | Interrogation signal processor for air traffic control communications The present invention is directed to a Mode S uplink or interrogation signal demodulation system which can quickly recognize the Mode S signal and also filter out of noise present in the Mode S uplink or interrogation signal, thereby reducing the bit erro... | 02/18/1992 |
| 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 |
| 4970518 | Air traffic control radar beacon system multipath reduction apparatus and method A system and method for detecting and removing specular multipath reports from terminal ATCRB systems for aircraft targets having Mode 3/A transponder reporting capabilities. Reports are delayed for a first time, or azimuth, interval to determine whether ... | 11/13/1990 |
| 4454510 | Discrete address beacon, navigation and landing system (DABNLS) An aircraft surveillance, navigation, landing, guidance and collision avoidance system is provided which takes the form of a two-way data communication link between each of a plurality of controlled aircraft and a ground station, and appropriate measuring... | 06/12/1984 |
| 4293857 | Collision avoidance warning system An aircraft collision-avoidance system utilizing a known-location navigational ground station to enable a primary aircraft to determine its own location and employing a known-location air surveillance radar including an interrogator to determine the locat... | 10/06/1981 |
| 4197538 | Pilot's traffic monitoring system A pictorial display system in which continuously updated images of `other ship` aircraft within a specified airspace envelope are superimposed on a map display along with the pilot's `own ship` position, whereby collision threats are avoided by taking cor... | 04/08/1980 |
| 4161729 | Beacon add-on subsystem for collision avoidance system By adding an indicator control panel to the cockpit and a small receiver-decoder unit between the transponder and the antenna of aircraft having a conventional air traffic control radar beacon system transponder, mid-air collision avoidance capability is ... | 07/17/1979 |
| 4060805 | Integrated terminal area surveillance system An integrated airport terminal area surveillance system, including a plurality of spaced apart interrogating and receiving stations and central equipment for controlling the stations operates in search and track modes by transmitting interrogation message... | 11/29/1977 |
| 4050069 | Transponder based landing system An air traffic control system wherein a ground based interrogator/receiver nterrogates an aircraft transponder which, in addition to responding to the interrogation, also transmits automatic encoded altitude information. The interrogator/receiver unit proc... | 09/20/1977 |
| 4027307 | Collision avoidance/proximity warning system using secondary radar Proximity indication and evaluation of mobile vehicles, using the signals emitted by the hundreds of existing secondary radar ground stations and the nearly 100,000 cooperating transponders on the vehicles, to detect intrusion in a monitored proximity vol... | 05/31/1977 |
