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| Number | Title | Issue Date |
| 7619557 | Method and device for filtering a video signal received by a secondary radar, particularly in order to eliminate mode S replies The invention applies to secondary radars. It makes it possible to carry out filtering when seeking to detect SSR responses, these SSR responses being overlapped by a mode S response. According to the invention, the pulses of the mode S response are filtered without... | 11/17/2009 |
| 7551120 | Method and a system for filtering tracks originating from several sources and intended for several clients to which they are supplied The present invention concerns a method and a system for filtering tracks originating from several sources and intended for several clients to which they are supplied. The method comprises at least a phase (8) for establishing a link between tracks res... | 06/23/2009 |
| 7397415 | System and method for detecting and de-interleaving radar emitters A method of classifying radar emitters includes the steps of: (a) receiving pulses from multiple radar emitters; (b) categorizing received pulses based on pulse data descriptors (PDWs); (c) forming clusters of received pulses based on the PDWs; and (d) de-interleavi... | 07/08/2008 |
| 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 |
| 7277043 | Tactical aircraft check algorithm, system and method A method of generating aircraft tactical alerts includes receiving track positions for two aircraft; receiving trajectories and static conformance bounds for the two aircraft; receiving current position for the two aircraft; generating tactical check segments and va... | 10/02/2007 |
| 7231194 | Localization of narrowband signals The invention relates to detecting a narrowband signals from received signals. According to the different aspects of the invention, a sample set is first formed from received signals, whereby elements of the sample set represent their absolute values, and a lower re... | 06/12/2007 |
| 7140040 | Protecting wireless local area networks from intrusion by eavesdropping on the eavesdroppers and dynamically reconfiguring encryption upon detection of intrusion Apparatus for eavesdropping within an area layer adjacent to and surrounding a LAN area periphery for potential wireless transmissions of an intruder having a lower frequency within a level below the LAN frequency; and an implementation responsive to said eavesdropp... | 11/21/2006 |
| 7120537 | System and method for characterizing traffic behavior at an airport A method is provided for characterizing traffic behavior at an airport. Scheduled and real-time flight information for the airport is obtained and used to determine, over a selected interval of time, flight delay information. The flight delay information is used to ... | 10/10/2006 |
| 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 |
| 7065443 | System and method for estimating aircraft flight delay A method and system estimate, in real time, the amount of any delay in departure of an aircraft flight from an airport. Various embodiments include receiving in a first computer process a conditions input that includes at least one member of a set including departur... | 06/20/2006 |
| 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 |
| 6985102 | Method and system for deinterleaving A method of deinterleaving parameter descriptor word (PDW) data includes parallel scoring of pulses in an a posteriori search for associating of pulses based on proximity within a multi-parameter problem space. The a posteriori search includes scoring an oldest puls... | 01/10/2006 |
| 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 |
| 6727842 | Digital IF processor Apparatus for processing a signal of a predetermined intermediate frequency (IF) to generate in-phase (I) and quadrature (Q) components thereof comprises: an analog-to digital converter circuit for sampling and digitizing the IF signal to generate digitized data sam... | 04/27/2004 |
| 6573858 | Tandem-cycle target/track assignment method in combined radar/ADS surveillance environment A target/track assignment method for a combined radar/ADS surveillance environment uses tandem cycles to help the air traffic control system update the order of system tracks, thereby permitting numerous target reports to be processed in real time.... | 06/03/2003 |
| 6483453 | Method for reducing transmit power for traffic alert and collision avoidance systems and airborne collision avoidance systems The present invention provides a method for efficient use of the transmit power of a Traffic Alert Collision Avoidance System (TCAS) that allows enhanced surveillance range and limits radio frequency (RF) interference in crowded airspace. The method reduc... | 11/19/2002 |
| 6337652 | SSR station and aircraft secondary surveillance network An SSR reply, which is sent out from an aircraft, is received and separated into one SSR reply to one SSR station and the other SSR reply to the other SSR station, thereby generating aircraft information of the aircraft based on one of the one SSR reply a... | 01/08/2002 |
| 6005510 | Method for the processing of multiple paths The invention relates to the processing of the multiple paths in an interrogator station which, in response to a salvo of interrogations, receives responses in the form of pulses. The station comprises at least two reception channels. The responses to eac... | 12/21/1999 |
| 5920278 | Method and apparatus for identifying, locating, tracking, or communicating with remote objects A broadband transmitter element, located at a remote object, transmits a broadband signal at a prescribed transmission time. A broadband receiver element, located at a base platform spaced from the remote object, receives electromagnetic radiation during ... | 07/06/1999 |
| 5596326 | Secondary surveillance radar interrogation system using dual frequencies A communication system is provided for identifying the position of aircraft in a surveillance area. The communication system includes a dual-frequency interrogator which produces two signals at different frequencies. These signals are transmitted over a n... | 01/21/1997 |
| 5583505 | Radar pulse detection and classification system A radar pulse detection and classification system receives times-of-arrival of pulses from simultaneous emitters over a wide range of pulse repetition frequencies (PRF's). The pulses are deinterleaved into bands of pulse repetition intervals (PRI's) so th... | 12/10/1996 |
| 5574459 | Device for the detection and characterizing of radar pulses The device comprises an analog-digital converter coupled between a pulse receiver and a device to extract the continuous level of the signal given by the receiver. The continuous level extraction device is coupled to an edge detection device and to a scra... | 11/12/1996 |
| 5486829 | Method of communicating information between an S-mode secondary radar and a target In a method of communicating data between a transmission/reception center and a target, a transaction is constituted by one or more interrogation pulses sent out by the center followed by one or more associated reception windows designed to receive the re... | 01/23/1996 |
| 5477225 | Method and apparatus for associating target replies with target signatures Apparatus for associating target reply signals with target signatures, wherein each reply signal is received from a target transponder within a selectable time period, and further wherein each target signature comprises a first set of parameter values tha... | 12/19/1995 |
| 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 |
| 5455586 | Pulse recognition method and device, and use thereof for the filtering of the S mode responses of a secondary radar Disclosed are a device for the detection of S mode responses received by a secondary radar receiver and its use for the filtering of the pulses contained in this response. The device furthermore comprises means to detect a signal S, means for the real-tim... | 10/03/1995 |
| 5432517 | Method and device for the filtering of responses in a secondary radar extractor A method for the defruiting of the responses from radar transponders received by a secondary radar in response to interrogations sent by the radar recurrently, a recurrence being formed by the interrogation and the responses received during a listening pe... | 07/11/1995 |
| 5406288 | Method and device to improve the probability of validity of the codes of secondary radar responses Disclosed are a method and device for the real-time processing of the responses constituted by pulse signals emitted by secondary radar transponders. The device has an analyzer of sampled magnitudes characterizing the pulses, said magnitudes being prepare... | 04/11/1995 |
| 5394152 | Radar processing apparatus and method A radar processor comprises a multi-port memory device having memory which can be accessed by at least three ports. A first port receives input data from a data providing means. A second port couples a first processor which performs radar processing. A th... | 02/28/1995 |
| 5387915 | Method and apparatus for detecting and decoding transponder reply signals Methods and apparatus for detecting and decoding transponder reply signals of the type having a plurality of associated time discrete pulses including two bracket pulses and a number of related data pulses that may have been transmitted at discrete data t... | 02/07/1995 |
| 5367303 | Parallel observer spatial evaluator A method and means for evaluating transponder reply signals in a secondary radar system to differentiate valid replies from false replies. Transponder reply signals received by the interrogating radar are decoded to establish conformity with an establishe... | 11/22/1994 |
| 5341139 | Method and device to detect the garbling of pulses received by a secondary radar In a method for the detection of the garbling of pulses received by a secondary radar, the secondary radar comprises a monopulse antenna that can be used to obtain a pulse power signal and a pulse difference measurement signal synchronous with the receive... | 08/23/1994 |
| 5317316 | Method of altitude track initialization in an aircraft tracking system A method of processing a plurality of replies of target aircraft provided in response to interrogation signals from the surveillance aircraft during surveillance periods to determine whether an altitude track may be initialized for use in a traffic alert ... | 05/31/1994 |
| 5317317 | Method and device to detect the garbling of pulses received by a secondary radar by phase analysis Disclosed are a method and a device to detect the intermingling, hence the garbling, of pulses received by a secondary radar by phase analysis. The monopulse reception antenna of a secondary radar delivering a sum signal given by its sum channel and a dif... | 05/31/1994 |
| 5264853 | Method of reducing false tracks due to suppression pulse replies in an aircraft tracking system In an aircraft which has a tracking system, the aircraft interrogates all target aircraft in the vicinity of the aircraft in order to determine potentially dangerous situations. The interrogation has a predetermined interrogation sequence which includes i... | 11/23/1993 |
| 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 |
| 5218365 | Beacon interrogator beamwidth control using sidelobe signal integration in transponders A method for inhibiting responses by transponders to interrogation signals originating in the side lobes of an interrogating radar of a secondary radar system. The interrogating radar first transmits a reference signal with the highest power level of the ... | 06/08/1993 |
| 5142287 | Technique for demodulating and decoding MLS DPSK transmissions using a digital signal processor A system for demodulating and decoding differential phase shift keying (DPSK) transmissions utilizes a bandpass filter, an analog to digital converter and a digital signal processor. Removal of the effects of unknown frequency component is achieved by app... | 08/25/1992 |
| 5126744 | Beacon and mode-4 defruiter A defruiter for filtering fruit replies from a reply data signal in a radar system. The defruiter includes a window memory, a main memory, a counter and a main defruiter. Another version of the defruiter includes the items listed above and, additonally, a... | 06/30/1992 |
| 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 |