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| Number | Title | Issue Date |
| 6937183 | Object detecting method and object detector Beams are irradiated in three directions by switching an irradiation direction of a mainlobe of an antenna by stages, and an echo is received from a detection object obtained in the mainlobe or a sidelobe in each irradiation direction. Then, reflection power intensi... | 08/30/2005 |
| 6809679 | Surveillance system and method for aircraft approach and landing A system and method for measuring and predicting information on the position of approaching aircraft are disclosed. The system features a processor, an interrogating antenna, a receiving antenna, and a data link. The processor schedules interrogations and suppressio... | 10/26/2004 |
| 6282487 | Runway reservation system Weather information is stored in a weather information storage unit. Information of aircraft flight situation, flight plan, air traffic flow management, and condition status is stored in an aircraft information storage unit. On the basis of information st... | 08/28/2001 |
| 6094169 | Multilateration auto-calibration and position error correction The accuracy of multilateration systems can be greatly improved by using a correction method based on the SLS (Sideband Lobe Suppression) signal produced by a Secondary Surveillance Radar (SSR). Multilateration is a cooperative surveillance technique for ... | 07/25/2000 |
| 5539407 | Radar apparatus provided with ECCM facilities A radar apparatus that is provided with auxiliary antennas (5, 10) of an omnidirectional nature. In addition to customary ECCM applications, such as side-lobe suppression and side-lobe blanking, the auxiliary antennas (5, 10) are also used for the emissio... | 07/23/1996 |
| 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 |
| 5525990 | Coherent antenna sidelobe suppression system A sidelobe suppression system including an antenna with a variable phase ter, a transmitter for transmitting an expanded phase-coded pulse, a receiver for receiving target echos, a pulse expander/compressor for phase coding the expanded transmitted pulse... | 06/11/1996 |
| 5512900 | Aircraft landing systems An MLS system comprising ground based equipment which includes a microwave signal transmitter arranged to feed microwave signals to radiator elements of an array antenna via phase shifter modules one of which is provided for each of the said elements, whe... | 04/30/1996 |
| 5481270 | Radar with adaptive range sidelobe suppression A method and apparatus for identifying a remote target includes a transmitter for transmitting pulses of energy toward the target for generating echo signals, and a receiver for receiving the echo signals, and for generating received signals representing ... | 01/02/1996 |
| 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 |
| 5374932 | Airport surface surveillance system An airport surface traffic surveillance and automation system addresses a wide variety of airport surface conflict scenarios using a combination of runway-status lights, controller alerts, and enhanced controller displays. Runway-status lights, composed o... | 12/20/1994 |
| 5302953 | Secondary radar antenna operating in S mode This invention concerns a secondary radar antenna operating in S mode. The antenna comprises a row of columns (1) of radiating elements powered by a hyperfrequency distribution circuit (2) containing a summing channel (Σ), a difference channel (Ɗ) and a seco... | 04/12/1994 |
| 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 |
| 5173706 | Radar processor with range sidelobe reduction following doppler filtering A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with &#b1;45° coverage in azimuth, from 0° to 60° in elevation. Each antenna element of each phased... | 12/22/1992 |
| 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 |
| 4689623 | Monopulse processing systems A secondary surveillance radar system in which monopulse processing is used to obtain angle estimation of azimuth bearing, involving a monopulse processor, two independent phase detectors in respective A and B channels, the arrangement being such that a l... | 08/25/1987 |
| 4656477 | Perfectioning in reply type radar systems, in particular the SSR type The invention regards a perfectioning in reply type radar systems, in particular SSR (Secondary Surveillance Radar) or IFF (Identification Friend or Foe). The invention has as its aim that of eliminating or reducing undesired replies due to reflections fr... | 04/07/1987 |
| 4540986 | Video processor for air traffic control beacon system A circuit for use in a transponder located in an aircraft or the like for identifying a true side lobe suppression signal being transmitted by a ground located transmitted system. The true side lobe suppression signal includes at least pulses P1 and P2. T... | 09/10/1985 |
| 4468667 | Detection of an identification signal contained within a composite signal, without false signal recognition A system for detecting the presence in a sampled composite signal of an identification signal having a predetermined frequency without falsely recognizing other sharp signal transitions in the sampled signal as the identification signal. The system includ... | 08/28/1984 |
| 4467326 | Method and apparatus for preventing the response of a radar beacon to receive radar pulses originating from the side lobes of a transmitter and an arrangement A method for preventing a radar beacon's response to received pulses from a vessel which originate from the side lobes of the vessel antenna. The carrier frequency of the radar signal pulses to and received by the beacon is measured and a value of this fr... | 08/21/1984 |
| 4316190 | Secondary surveillance radar A secondary surveillance radar is provided with means for reducing the effect of undesirable reflections on the interrogation pulses transmitted by the radar and the replies received in response to the interrogations. In addition to a directional antenna ... | 02/16/1982 |
| 4296414 | P-I-N type diode high frequency switch for secondary radar interrogation devices and transponders A P-I-N type diode high frequency switch in a secondary radar interrogation device working with ISLS and RSLS and consisting of a transmitter, two receivers and two antennas. So as to reduce the high cost for P-I-N type diodes, including driver stages for... | 10/20/1981 |
| 4135187 | Transponder decoder/encoder circuitry A single crystal controlled oscillator provides clock pulses that are used to drive both the decoder shift register and the encoder shift register of an ATC transponder. An input pulse of the interrogation signal from a ground station is shifted down in t... | 01/16/1979 |
| 4100544 | Beacon system employing ramped gain receiver A beacon receiver or IFF system in which the gain of the receiver is time varied to enhance the discrimination between response from transponders located ahead of the interrogator as compared with the responses from transponders in the side or rear lobe r... | 07/11/1978 |
| 4075631 | System for identifying objects equipped with an automatic transponder There is described a system for interrogating objects equipped with an automatic transponder in which a fixed station transmits an interrogation signal formed by at least two characteristic pulses and the transponder returns a coded response consisting of... | 02/21/1978 |
| 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 |
