Patents Assigned to ELTA SYSTEM, LTD
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Patent number: 8249618Abstract: There is provided a system and method for positioning a receiver, the system comprising an antenna array coupled to a common generating and switching unit. The generating and switching unit is configured to generate a periodic signal and to switch the signal between at least two antennas, constituting a positioning signal; such that an RF receiver receiving the positioning signal and having a phase difference estimator is capable to measure phase differences between portions of the positioning signal transmitted by the spaced-apart antennas, the phase differences indicating the orientation of the received relative to the positioning system.Type: GrantFiled: July 25, 2006Date of Patent: August 21, 2012Assignee: Elta Systems, Ltd.Inventor: Moshe Fireaizen
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Patent number: 8237607Abstract: A method and system for coordinating air-to-air tracking and air-to-ground tracking for an airborne tracked target that is landing or performing an airdrop. Air-to-air tracking data is analyzed to detect if the tracked target is landing, and a predicted landing location is computed. An air-to-ground sensor is activated, via a separate air-to-ground tracking module or via a mode change, and the air-to-ground tracking is initiated at the predicted landing location of a detected target. Both automated and manually-assisted air-to-ground activation are supported.Type: GrantFiled: December 25, 2008Date of Patent: August 7, 2012Assignee: Elta Systems Ltd.Inventor: Yahali Merhav
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Patent number: 8229472Abstract: There is provided a method and system for positioning a transponder, the system comprising an antenna array of at least two spaced-apart antennas coupled to a common generating and switching unit. The generating and switching unit is configured for generating a periodic signal and switching the signal between said at least two antennas, constituting a positioning signal transmitted to the transponder. The system comprises a receiver for receiving a returned signal and a phase difference estimator coupled to the receiver and operable to measure phase differences between portions of the returned signal. The system further comprises a positioning utility coupled to said phase difference estimator and configured to determine the position of the transponder relative to the positioning system.Type: GrantFiled: July 25, 2006Date of Patent: July 24, 2012Assignee: Elta Systems Ltd.Inventor: Moshe Fireaizen
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Patent number: 8228235Abstract: The present invention provides for an antenna and a method for providing an antenna for transmitting and/or receiving electromagnetic waves of at least one predefined frequency and a circular polarization, the antenna comprising at least a first support having upper and lower faces and at least one pair of substantially identical upper and lower radiating elements disposed on the upper and lower faces, respectively, each radiating element being capable of transmitting and/or receiving electromagnetic waves of circular polarization with a phase center located at a predefined position.Type: GrantFiled: January 25, 2006Date of Patent: July 24, 2012Assignee: Elta Systems Ltd.Inventors: Laurent Habib, Claude Samson
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Patent number: 8212716Abstract: A method for calibrating an antenna comprising a phased array of antenna elements connected to a plurality of transceivers, the method comprising providing an RF source located close to the antenna and synchronized with the transceivers, determining, per antenna element, a calibration ratio adapted to accommodate for presence of at least one interfering structure electromagnetically interfering with a signal transmitted from the RF source and received by the antenna, wherein the determining includes generating simulated far field and near field signals so as to simulate a signal transmitted by an RF source located at infinity and located near the RF source respectively, internally injecting an internal signal into the antenna via an internal injection network, using the RF source to externally inject an external signal into the antenna; and, for each individual antenna element, computing said calibration ratio by combining information characterizing the internal and external signals as received by the individType: GrantFiled: August 5, 2010Date of Patent: July 3, 2012Assignee: Elta Systems Ltd.Inventors: Elad Goshen, Yacov Vagman, Haim Reichman
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Patent number: 8121158Abstract: A light projection optical system is presented. The system comprises a cooling chamber containing: a light source operative at a cool temperature being lower than 240K; a cooler unit capable of cooling said light source to said cool temperature during the light source operation,- an optical window permitting light emergence outside from the cooling chamber; and an optical unit accommodated in the optical path of light emitted by said light source and enabling emergence of this light through said optical window outside from the cooling chamber.Type: GrantFiled: November 29, 2006Date of Patent: February 21, 2012Assignees: Elta Systems Ltd., Optigo Systems, Ltd.Inventors: Ori Aphek, Gil Tidhar
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Patent number: 8107558Abstract: A method and a calculating circuit for generating an output signal representing an actual amplitude of a received digitized signal having a magnitude of the actual amplitude equal or greater than a value of a saturation level of a dynamic range of a receiver. For the determination of the actual amplitude, firstly, a predetermined time interval is selected. Then, a total number of samples of the received digitized signal within the predetermined time interval is calculated. Further, a number of samples of the received digitized signal within the predetermined time interval with the amplitude equal to the saturation level is calculated. Thereafter, a ratio between the number of the samples with the amplitude value equal to the saturation level and the total number of the samples is calculated. For calculation of the magnitude of the actual amplitude a predetermined relationship between the magnitude of the amplitude and the ratio is applied and the output signal representing the actual amplitude is provided.Type: GrantFiled: January 8, 2009Date of Patent: January 31, 2012Assignee: Elta Systems Ltd.Inventor: Moshe Fireaizen
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Patent number: 8103167Abstract: A free space optical communication system is described that comprises a receiver node and a transmitter node communicating to each other via a control data communication channel and an information data communication channel operating at a wavelength region different from the wavelength region of the control data communication channel. The receiver node includes a receiver unit configured to receive an information data signal provided by the transmitter node through the information data communication channel, and to recover information from said information data signal; an interrogator unit configured for generating and radiating an interrogation data signal through the control data communication channel in order to initiate and terminate an information data communication session between the receiver node and the transmitter node; and a receiver node controller configured for controlling operation of the receiver unit and the interrogator unit.Type: GrantFiled: May 7, 2009Date of Patent: January 24, 2012Assignees: Elta Systems Ltd., Optigo Systems Ltd.Inventor: Gil Tidhar
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Patent number: 8076992Abstract: A method for fabrication of an inaccessible RF microwave waveguide structure is provided. The method includes providing an RF microwave waveguide network including an array of waveguide components that have one or more apertures in a wall. The method also includes providing one or more dummy load elements made of a ceramic material having high-temperature stable properties. The dummy load elements are mounted in a predetermined place on the wall in the vicinity of the aperture. The method also includes providing a blocking assembly configured for covering RF microwave waveguide network. The blocking assembly is connected to the RF microwave waveguide network by using dip brazing.Type: GrantFiled: September 4, 2010Date of Patent: December 13, 2011Assignee: Elta Systems Ltd.Inventors: Arie Rabi, Yehuda Green
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Patent number: 8022874Abstract: A respective electromagnetic parameter and spatial disposition of an unknown number of signal sources in a surveillance space simultaneously bombarded by multiple signals are determined by receiving multiple signals at each of a plurality of widebeam, wideband antennas equally spaced apart in a linear array. Respective antenna signals are simultaneously sampled to generate a two-dimensional array of values. A two-dimensional Fourier transform is computed whose peaks satisfy one or more predetermined criteria, each peak being indicative of a signal source in the surveillance space, whereby the location of the peak in the Fourier transform Fjk indicates the frequency and the azimuth of the respective signal source and the amplitude of the peak indicates the amplitude of the signal source.Type: GrantFiled: October 31, 2007Date of Patent: September 20, 2011Assignee: Elta Systems Ltd.Inventor: Moshe Frieaizen
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Publication number: 20110223908Abstract: The present invention provides an apparatus and method for intercepting and monitoring communications between target mobiles and a main station of a satellite communication system, wherein communication between the mobiles and a satellite is achieved by using a first-band spot beams, chosen by the mobiles and wherein communication between the satellite and the main station is achieved by using a wideband second-band link, and wherein the satellite is operable to change the mapping scheme of the first-band frequencies to the second-band frequencies, the apparatus comprises: at least one RF second-band and at least one RF first-band receive antenna which transmits the received signals to at least one RF second-band and at least one first-band receiver respectively; an intermediate frequency RF distributor which receives signals from said RF second-band and RF first-band receivers and splits the transmission into groups of frequencies; a plurality of demodulators which are tuned to cover sequentially the first-bType: ApplicationFiled: May 23, 2011Publication date: September 15, 2011Applicant: Elta Systems Ltd.Inventor: Benjamin GILOH
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Patent number: 8013783Abstract: A phased antenna arrangement and a method for estimating the calibration ratio of an active phased antenna having a plurality of phased array antenna elements are described. The phased antenna arrangement includes a plurality of antenna elements, a plurality of receiving channels, an injection unit for injection of calibrating signals into the receiving channels, a point RF-source, located in a far field zone, a distance measurement unit, an amplitude and phase measurement unit and a data processing unit. The method comprises injecting an internal calibrating signal having a known amplitude and phase to each antenna element. An external calibration signal from a stationary RF-source is sequentially injected to all of the phased array antenna elements so that different phases of the external calibration signal arrive at each of the antenna elements.Type: GrantFiled: June 28, 2010Date of Patent: September 6, 2011Assignee: Elta Systems Ltd.Inventors: Alexander Lomes, Yacov Vagman, Haim Reichman
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Patent number: 7928890Abstract: A phased array radar antenna includes at least two antennas (11, 12, 13, 14) adapted for simultaneous operation at different non-mutually interfering frequencies. The phased array radar antenna may be fitted to an aircraft having a fuselage supporting first and second radar side antennas (11, 12) on opposite sides thereof, a nose portion supporting a first radar end antenna (13), and a tail portion supporting a second radar end antenna (14). Respective radomes cover the first and second radar end antennas so as to provide a smooth aerodynamic contour, and a radar control unit (15) is disposed within the fuselage and coupled to the first and second radar side antennas and to the first and second radar end antennas for operating the first or second radar side antenna simultaneously with the first or second radar end antenna at respective first and second different frequencies.Type: GrantFiled: May 9, 2005Date of Patent: April 19, 2011Assignee: Elta Systems Ltd.Inventors: Jehezkel Grizim, Alexander Lomes, Yacob Wagman, Shmuel Ron, Haim Richman, Abraham Reich, David Rabia
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Patent number: 7920255Abstract: According to some embodiments of the invention a laser directed infrared countermeasures system (hereinafter: “LDIRCM system”) is mountable on a platform. According to some embodiments of the invention, a LDIRCM system may include a plurality of sector units. Each sector unit may include at least one laser unit and a laser guidance module. The laser unit may be adapted to generate a laser beam or laser energy that is intended for jamming a guidance system of a threat. The laser unit may be coupled to the laser guidance module. The laser guidance module may be adapted to steer at least a laser beam generated by the laser unit towards a threat.Type: GrantFiled: April 10, 2007Date of Patent: April 5, 2011Assignees: Elta Systems Ltd., Optigo Systems Ltd.Inventors: Ori Aphek, Gil Tidhar, Tal Goichman
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Publication number: 20110068969Abstract: A method and system for SNR enhancement in pulse-Doppler coherent target detection. In accordance with the method of the invention, complex signals are obtained for each of two or more sub-intervals of the time-on-target interval, allowing simultaneous range and Doppler measurements. A coherent integration is then performed on the signals to generate complex-valued folded matrices. The folded matrices are unfolded and target detection is then performed in a process involving one or more of the unfolded matrices. A pulse-Doppler coherent system is also provided configured for target detection by the method of the invention.Type: ApplicationFiled: November 29, 2010Publication date: March 24, 2011Applicant: Elta Systems Ltd.Inventors: Ella Beilin, Jehezkel Grizim, Yacov Vagman, Alexander Lomes
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Publication number: 20110025549Abstract: A method and system for coordinating air-to-air tracking and air-to-ground tracking for an airborne tracked target that is landing or performing an airdrop. Air-to-air tracking data is analyzed to detect if the tracked target is landing, and a predicted landing location is computed. An air-to-ground sensor is activated, via a separate air-to-ground tracking module or via a mode change, and the air-to-ground tracking is initiated at the predicted landing location of a detected target. Both automated and manually-assisted air-to-ground activation are supported.Type: ApplicationFiled: December 25, 2008Publication date: February 3, 2011Applicant: Elta Systems Ltd.Inventor: Yahali Merhav
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Patent number: 7864106Abstract: A method and system for SNR enhancement in pulse-Doppler coherent target detection for applications in the fields of radar and ultrasound. In accordance with the method of the invention, complex signals are obtained for each of two or more sub-intervals of the time-on-target interval, allowing simultaneous range and Doppler measurements. A coherent integration is the performed on the signals to generate complex-valued folded matrices. The folded matrices are unfolded and target detection is then performed in a process involving one or more of the unfolded matrices. A pulse-Doppler coherent system is also provided configured for target detection by the method of the invention.Type: GrantFiled: April 17, 2008Date of Patent: January 4, 2011Assignee: Elta Systems Ltd.Inventors: Ella Beilin, Jehezkel Grizim, Yacov Vagman, Alexander Lomes
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Publication number: 20100001896Abstract: There is provided a method and system for positioning a transponder, the system comprising an antenna array of at least two spaced-apart antennas coupled to a common generating and switching unit. The generating and switching unit is configured for generating a periodic signal and switching the signal between said at least two antennas, constituting a positioning signal transmitted to the transponder. The system comprises a receiver for receiving a returned signal and a phase difference estimator coupled to the receiver and operable to measure phase differences between portions of the returned signal. The system further comprises a positioning utility coupled to said phase difference estimator and configured to determine the position of the transponder relative to the positioning system.Type: ApplicationFiled: July 25, 2006Publication date: January 7, 2010Applicant: Elta Systems LTD.Inventor: Moshe FIEREIZEN
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Publication number: 20090248398Abstract: A system and method for instructing dynamic nodes in a dynamically changing mobile network how to maneuver. A receiver receives situation data indicative of a respective situation of each dynamic node in space and a situation unit coupled to the receiver determines the respective situation of each dynamic node. An analysis unit coupled to the situation unit analyzes the respective situation of each dynamic node in combination with specified criteria to generate respective situation awareness date for each dynamic node. A dynamic selector unit coupled to the analysis unit determines from the respective situation awareness data appropriate action to be performed by each node; and a communication unit coupled to the dynamic selector unit conveys to the respective dynamic node command data to permit rendering of a personalized command for informing the respective node of appropriate action to be carried out thereby.Type: ApplicationFiled: September 13, 2006Publication date: October 1, 2009Applicant: Elta Systems LtdInventors: Moshe Aviran, Alexander Zussman
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Publication number: 20090167308Abstract: In a method and system for monitoring an underground cable in a site of interest, multiple samples of magnetic field data and corresponding location data are collected periodically over a sampling period of extended time. The magnetic field data samples and corresponding location data are processed to determine respective topologies of one or more current-carrying conductors in the site and for each of the conductors respective magnetic field data relating to each sampled point are integrated with respect to a predetermined parameter of the respective conductor so as compute an integrated contribution of each sampled span along the respective conductor. The data relating to different conductors in the site are output in a manner that allows determination of a conductor for which the parameter changes during the sampling period.Type: ApplicationFiled: December 26, 2007Publication date: July 2, 2009Applicant: Elta Systems Ltd. Israeli CompanyInventor: Alexander LOMES