Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7920086 | Display for displaying compressed video A display is configured to display transformed video. The display includes a display unit comprising pixels. The display also includes a set of filter elements positioned adjacent to the display unit. The set of filter elements enable the display unit to display tra... | 04/05/2011 |
| 7847722 | Secondary surveillance radar and method of analyzing replies for secondary surveillance radar Provided is a secondary surveillance radar with an improved capability of eliminating an unnecessary Mode A/C target report, which includes a transmission unit transmitting interrogations, a reception unit receiving replies, from a transponder, corresponding respect... | 12/07/2010 |
| 7710308 | Mode S secondary surveillance radar system It is related to a mode S secondary surveillance radar system for carrying out a target (aircraft) surveillance with a high reliability, where a surveillance processor 39 produces a detection report of a acquisition surveillance by a scan of an antenna therea... | 05/04/2010 |
| 7663531 | Secondary surveillance radar system, and ground system for use therein A secondary surveillance radar system comprising a including a ground system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist, wherein the ground system compr... | 02/16/2010 |
| 7492307 | Collision risk prevention equipment for aircraft This equipment is of the TCAS type. In order to improve its integrity and the reliability of its measurements, its computing unit is provided with a cross-checking function carrying out the comparison between two values of a same parameter, for example a relative di... | 02/17/2009 |
| 7429950 | Method and apparatus to extend ADS performance metrics A method and system are provided for measuring and monitoring performance metrics of a non-ADS-B tracking system and generating performance metrics for the non-ADS-B tracking system in terms of ADS-B equivalent performance metrics. An aircraft transmits various tran... | 09/30/2008 |
| 7423590 | Method and apparatus for improving ADS-B security Security of ADS-B transmissions is improved in a first embodiment to detect position spoofing. The annunciated position source may then be compared with the derived source and a determination is made regarding the difference between the results. Any position differe... | 09/09/2008 |
| 7420501 | Method and system for correlating radar position data with target identification data, and determining target position using round trip delay data A method and system for using a single transceiver to correlate radar position data with target identification data. Two transceivers, operating in round trip delay mode, can be used to provide two possible positions for a given target when radar coverage is lost or... | 09/02/2008 |
| 7408498 | Secondary surveillance radar and its interrogation transmission method An interrogation transmission method of a secondary surveillance radar compares prediction angle ranges for transmitting interrogations with a beam-width of an antenna, and transmits the interrogations at every roll-call period if the prediction angle ranges for tra... | 08/05/2008 |
| 7408497 | Method and device for determining a reference value of a response, in particular of a mode S response received by a secondary radar The present invention applies to the surveillance of, in particular civil, air traffic, and more particularly, to cooperative aircraft ground systems which make it possible to pinpoint in radial distance and in azimuth the aircraft present in a certain volume and to... | 08/05/2008 |
| 7391359 | Mode S transponder transmission signal decoder and Mode S transponder transmission signal decoding method There are provided a differential processing unit which performs differential processing for a Mode S transponder transmission signal, an auto correlation arithmetic operation unit which performs an arithmetic operation of a degree of auto correlation between an inc... | 06/24/2008 |
| 7352318 | Method and system for real time pulse processing in ATCRBS/Mode-S transponders An apparatus for processing pulses in ATCRBS/Mode S interrogations includes an antenna for receiving a radio frequency interrogation signal. The radio frequency interrogation signal is downconverted by a downconverter to an intermediate frequency signal. The interme... | 04/01/2008 |
| 7333394 | Navigational aid for diver A diver unit computes the direction and distance to a specified target. When the target is obstructed, the diver unit receives navigation assistance data from another diver unit. The navigation assistance data includes direction information that is referenced to a c... | 02/19/2008 |
| 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 |
| 7286062 | Perspective view conformal traffic targets display A system and method for displaying traffic targets in a conformal perspective view. The system comprises a display screen for graphical display of data, one or more sensors for obtaining traffic data regarding traffic targets, and one or more processors for receivin... | 10/23/2007 |
| 7283844 | Multi-beam antenna wireless network system A wireless network system that utilizes a multi-beam antenna to communicate with multiple remote stations. The system includes a hub and one or more remote stations. The hub is connected to a source which requires communication with the remote stations, in order to ... | 10/16/2007 |
| 7256728 | Aircraft avoidance system for prohibiting an aircraft from entering an exclusion zone The present invention relates to an avoidance system and method for directing an aircraft away from an exclusion zone. The exclusion zone may be any three dimensional space for example about a building or city. The avoidance system uses a constant signal from a grou... | 08/14/2007 |
| 7248219 | Correlation of flight track data with other data sources A method of triangulating aircraft transponder signals using a number of receivers connected to a central station over communication links includes applying at least one logic rule at each receiver to incoming transponder signals to filter redundant transponder sign... | 07/24/2007 |
| 7215278 | Radar frequency hopping Apparatus and methods for adjusting or “hopping” the center frequency or the pulse repetition frequency of a radar system improve the co-locatability of multiple radars commonly located in a region. In a Time Domain Downconversion (TDDC) or Ultra-Wideband (UWB) ... | 05/08/2007 |
| 7212917 | Tracking, relay, and control information flow analysis process for information-based systems Methods and apparatus for controlling movement of aircraft through a defined air space are disclosed. In one embodiment, a method includes generating a model of the defined air space. The model is configured to indicate a safe subset of the defined air space for mov... | 05/01/2007 |
| 7196638 | Embedded digitization system An embedded digitization system enables a military platform to receive, transmit and process a variety of types of information for a variety of purposes. An apparatus and method provides a means to ensure information interoperability between the invention and extern... | 03/27/2007 |
| 7170441 | Target localization using TDOA distributed antenna This invention is a system and method of locating a target using distributed antenna. The antenna consists of several receiving elements in known locations. At least one of the receiving elements is also a transmitter and transmits an interrogation signal to a targe... | 01/30/2007 |
| 7158073 | Systems and methods for managing transmission power into a shared medium A system for transmitting into a shared medium includes a processor, a transmitter, and a receiver. The processor is coupled to the transmitter for transmitting in a manner, at a time, and at a power level as directed by the processor. The processor determines from ... | 01/02/2007 |
| 7126534 | Minimum safe altitude warning A ground-based CFIT warning system provides pilots with CFIT alerts. The system is based upon a ground-based tracking system, which provides surveillance of aircraft, such as the AirScene™ multilateration system manufactured by Rannoch Corporation of Alexandria, V... | 10/24/2006 |
| 7116266 | Traffic alert and collision avoidance system enhanced surveillance system and method A traffic alert and collision and avoidance system (TCAS) is disclosed. The TCAS comprises a first transponder and a first interrogator associated with a first aircraft. The first transponder sends an interrogation request. The TCAS also comprises a second transpond... | 10/03/2006 |
| 7095360 | Secondary surveillance radar system, ground equipment for use therein, and response signal checking method applied thereto A secondary surveillance radar system for use in surveillance of an airspace, which reliably achieves surveillance of the airspace even when an aircraft including a mode S transponder and an aircraft including an ATCRBS transponder are both located in the airspace, ... | 08/22/2006 |
| 7015856 | Device and method for SPR detection in a Mode-S transponder A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signals. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a Mode-S data segment and an SPR signal therein. The transponder also inclu... | 03/21/2006 |
| 7006032 | Integrated traffic surveillance apparatus An apparatus and method for combining the functionality of multiple airborne traffic surveillance systems that operate in the L-band frequency range. The apparatus and method combine the functionality of both a Traffic Alert Collision Avoidance System (TCAS) and a M... | 02/28/2006 |
| 6999022 | Surveillance system A surveillance system for an aircraft includes a first antenna comprising a four radiating element antenna. The first antenna is configured for electrical coupling to a first air traffic control transponder and a first traffic alert and collision avoidance system, a... | 02/14/2006 |
| 6985103 | Passive airborne collision warning device and method A passive airborne mounted collision warning system suitable for light aircraft that enables an observer aircraft to determine the position of a nearby transponder-equipped target aircraft. The transponder-equipped target aircraft transmits replies responsive to int... | 01/10/2006 |
| 6922166 | System and method for distance measurement by inphase and quadrature signals in a radio system A system and a method for distance measurement utilizes a radio system. The distance is measured in coarse resolution, and in fine resolution that corresponds to distance attributes. The distance between first and second radio transceivers is determined from the coa... | 07/26/2005 |
| 6912461 | Multiple approach time domain spacing aid display system and related techniques A method for displaying a separation time interval of at least one of a plurality of objects approaching a reference includes estimating a transit time of the at least one of the plurality of objects assigned to a corresponding first path to the reference, determini... | 06/28/2005 |
| 6856274 | Device and method for SPR detection in a Mode-S transponder A method is provided for controlling when a transponder replies to Mode-S interrogation signals. The method includes receiving Mode-S signals containing P5 and P6 pulses. The received P5 and P6 pulses have certain amplitudes. Each P6 pulse contains a sync phase reve... | 02/15/2005 |
| 6844855 | Aircraft phased array antenna structure including adjacently supported equipment An aircraft phased array antenna system has transmit and receive antenna structures externally mounted on the aircraft fuselage. Each antenna comprises a plurality of phased array elements and antenna power and support equipment. Aerodynamically shaping antenna stru... | 01/18/2005 |
| 6819282 | Super-resolution processor/receiver to discriminate superimposed secondary surveillance radar (SSR) replies and squitter A super resolution processor/receiver to discriminate superimposed secondary surveillance radar (Mode S, Mode A/C) replies and squitter that uses frequency-domain analysis to suppress interference between replies. In particular, the processor/receiver uses a spectra... | 11/16/2004 |
| 6816105 | Vehicle surveillance system An algorithm for improved tracking of Air Traffic Control Radar Beacon System transponders is disclosed. The algorithm can be combined with a system that includes an interrogator which transmits an interrogation signal to an associated vehicle transponder at a first... | 11/09/2004 |
| 6788245 | Device and method for SPR detection in a mode-S transponder A method is provided for controlling transponder replies to Mode-S interrogation signals. The method includes receiving Mode-S signals containing P5 and P6 pulses each having certain amplitudes. Each P6 pulse contains a sync phase reversal (SPR)... | 09/07/2004 |
| 6768445 | Device and method for SPR detection in a mode-s transponder A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signal. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a Mode-S data segment and an SPR signal therein. The transponder also... | 07/27/2004 |
| 6765498 | Embedded digitization system An embedded digitization system which enables a military platform to receive, transmit and process a variety of types of information for a variety of purposes. The system includes a mission processing capability, a digital message communications capability, a time a... | 07/20/2004 |
| 6628225 | Reduced split target reply processor for secondary surveillance radars and identification friend or foe systems A method of processing reply signals received in response to an interrogation by a secondary surveillance radar system. The method includes the steps of receiving a reply signal from each of a plurality of targets, and enabling each of a plurality of targ... | 09/30/2003 |
