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| Number | Title | Issue Date |
| 7423589 | Method for localising at least one emitter The invention relates to a method of localization of one or more sources, said source or sources being in motion relative to a network of sensors, the method comprising a step of separation of the sources in order to identify the direction vectors associated with th... | 09/09/2008 |
| 7292179 | Instantaneous passive range finding A method and apparatus for use in determining the range in a single time sample from a platform to a target are disclosed. The method includes receiving radiation emanating from the target at two points on the platform in a common time sample; detecting the received... | 11/06/2007 |
| 6914559 | Direction finding method and system using digital directional correlators In an interferometer system, a revolving antenna array is used to sufficiently resolve all ambiguities in determination of frequency and direction of arrival of a wave-front. The frequency and direction of arrival are determined by matching predicted phase differenc... | 07/05/2005 |
| 6861983 | Method and apparatus for reducing electromagnetic interference and jamming in GPS equipment operating in rolling environments A method and apparatus for reducing electromagnetic interference (EMI) and jamming in Global Positioning System (GPS) receivers operating on rolling or spinning platforms and/or environments is provided. An antenna system having a pair of diametrically-mounted eleme... | 03/01/2005 |
| 6859172 | System and method for locating a mobile phone A system includes antenna control stations and a system interface. Each antenna control stations directs an orientation of an associated antenna to search for an identification signal associated with a mobile phone. The antenna control station communicates a detecti... | 02/22/2005 |
| 6759982 | Radio direction and position finding apparatus A detection apparatus is provided to detect the direction of arrival and the position of an emission source of radio wave with high accuracy. The apparatus comprises; a first and a second directional antenna 1 and 10 which rotates with a desired angle ... | 07/06/2004 |
| 6646602 | Technique for robust characterization of weak RF emitters and accurate time difference of arrival estimation for passive ranging of RF emitters A system for locating the position of an emitter emitting a signal having time domain features is described. At least two platforms are used. Both have a receiver for detecting the emitter signal, an FFT channelizer to act as a bandpass filter for extract... | 11/11/2003 |
| 6373435 | Radio direction and position finding apparatus An object of the present invention is to provide a selective level measuring apparatus with wider dynamic range of effective value detection, compared with the range by a conventional one. The apparatus according to the present invention comprises a gain ... | 04/16/2002 |
| 6344797 | Digital electronic locator A digital electronic locator which assists in locating the position and direction of an object/animal/person is described. Three configurations of the locator are presented; the first one is the basic configuration which gives an alerting means (Audio and... | 02/05/2002 |
| 5296863 | Beam compression process for antenna pattern A beam of a main antenna is scanned at a constant speed in the direction of compression of the beam width over the range of from (c-a) degree to (c+a) degree with an arbitrary angle c set as a reference angle, and a beam of a sub antenna is scanned by usi... | 03/22/1994 |
| 5218361 | Interferometer ambiguity resolution using missile roll Apparatus and methods of achieving accurate, unambiguous angle information with a minimum number of antenna elements. The present invention resolves the ambiguities inherent in a long baseline phase interferometer by employing a minimum number of antennas... | 06/08/1993 |
| 5198822 | Method and apparatus for determining the angle of arrival of a radar signal at a spinning interferometer Method and apparatus for quickly determining the angle of arrival of a signal at a spinning interferometer based on the phase rate of changes and the cone angles between respective pulses received at the spinning interferometer.... | 03/30/1993 |
| 5134409 | Surveillance sensor which is provided with at least one surveillance radar antenna rotatable about at least one first axis of rotation The invention relates to a surveillance sensor provided with at least one surveillance radar antenna 1 and at least one co-located and co-rotating electro-optical surveillance sensor 5 mechanically connected to said radar antenna. A combined panoramic pic... | 07/28/1992 |
| 5099248 | Transmission signal direction finding apparatus and method An apparatus and method for determining the direction of origin of a received transmission signal using a spinning antenna pair generally provides the steps and apparatus for measuring the phase difference between signals simultaneously received, coarsely... | 03/24/1992 |
| 4983983 | Semi-automatic direction finding set A receiver selects and amplitude demodulates an RF signal from one of a pality of directional antennas. The demodulated signal is then delayed to put it in time synchronism with the same signal information from an omnidirectional antenna. A signal is the... | 01/08/1991 |
| 4845502 | Direction finding method and apparatus A direction finding method and apparatus utilizes two receiving antennas which are disposed on a baseline that is rotated around its midpoint at a constant angular velocity. Signals received from a transmitter by the antennas are processed by circuitry th... | 07/04/1989 |
| 4633261 | Method and apparatus for correlating target track data A target track data correlating decision in a multisensor system which decides whether the tracking data and observation data sent from a plurality of sensor sites are ones on the same target or different targets on the basis of the data. The correlation ... | 12/30/1986 |
| 4626861 | Two angle range and altitude measurement system and methods A passive system and related methods for detecting range and/or elevation of a target by using an X beam antenna system and by measuring the time delay between receipt of signals in the two planes of the X beam which are received directly from the target ... | 12/02/1986 |
| 4621267 | Bearing intersection deghosting by altitude comparison system and methods A passive system and related methods for detecting the location of a plurality of N targets by using two X-beam antenna systems and by (i) measuring the time delay between receipt of signals in the two planes of each X-beam which are received directly fro... | 11/04/1986 |
