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| Number | Title | Issue Date |
| 8018383 | Method and apparatus for determining location using signals-of-opportunity A signal-of-opportunity location device (SOLD) that may be situated in a complex radio propagation environment with multiple RF signal obstructions receives RF signals from a distant transmitter. The RF signals from the distant transmitter interact with obstructions... | 09/13/2011 |
| 8004464 | Multiple object localisation with a network of receivers A technique is described for determining the correct locations of a plurality of objects by processing signals emitted by a transmitter and reflected by the objects to a plurality of receivers, No angle or elevation information is used. Object-receiver pair time dif... | 08/23/2011 |
| 7973716 | Systems and methods for transparency mapping using multipath signals Systems and methods for mapping a structure detect wireless signals, including at least one multipath signal that has experienced at least one reflection against a portion of the structure prior to the detection. The wireless signals are analyzed to estimate reflect... | 07/05/2011 |
| 7859463 | Method of detection in bistatic mode using non-cooperative passive radio transmissions The invention relates to the field of electromagnetic detection systems operating in bistatic mode, in particular to UHF/VHF bistatic radars. The method according to the invention consists in the simultaneous use of signals transmitted by one or more transmitting so... | 12/28/2010 |
| 7859464 | Robust low-frequency spread-spectrum navigation system Methods and apparatus are described for a navigation system. A process includes providing a plurality of transmitters distributed throughout a desired coverage area; locking the plurality of transmitters to a common timing reference; transmitting a signal from each ... | 12/28/2010 |
| 7782256 | Enhanced passive coherent location techniques to track and identify UAVs, UCAVs, MAVs, and other objects A system and technique is described which has the capability to track and identify, in real time, various aircraft and objects including Unmanned Aerial Vehicles (UAVs), Unmanned Combat Aerial Vehicles (UCAVs), and Micro Aerial Vehicles (MAVs). The system uses a com... | 08/24/2010 |
| 7764230 | Methods for locating transmitters using backward ray tracing According to a method for localizing a transmitter inside a building, a transmitter emits rays which undergo multiple reflections with the walls, ceilings and floors of the building. Each of K receivers receives rays from the transmitter, and the receivers estimates... | 07/27/2010 |
| 7679561 | Systems and methods for positioning using multipath signals A signal processing technique for RF active, passive, or aided localization approaches that utilizes multipath signals as additional measurements with a filter or estimator, e.g., a nonlinear filter. The filter uses indirect and direct path measurements or any other... | 03/16/2010 |
| 7427952 | Augmentation of commercial wireless location system (WLS) with moving and/or airborne sensors for enhanced location accuracy and use of real-time overhead imagery for identification of wireless device locations Mobile LMUs can be used in a Wireless Location System to provide detection coverage in areas lacking adequate receiver coverage. The mobile LMUs can be used to detect the radio frequency (RF) transmissions from wireless handsets and devices over a period of time to ... | 09/23/2008 |
| 7411550 | System for transmitting positioning signal A system for transmitting time-synchronized signals for positioning is provided. The system for transmitting positioning signals includes a transmitting apparatus mounted on artificial satellite, a repeater mounted on an artificial satellite, and a repeater mounted ... | 08/12/2008 |
| 7406320 | Method and system for location estimation in wireless networks A system and method for locating a wireless device in one or more wireless networks within a selected geographic region. The method includes generating a computer model of a selected geographic region including a layout and inputting information associated with one ... | 07/29/2008 |
| 7372403 | System and method for position determination by impulse radio A system and a method for position determination by impulse radio where first position information is determined for a first impulse radio using a positioning system, second position information is determined for the first impulse radio using at least one second imp... | 05/13/2008 |
| 7370362 | Method and apparatus for locating rogue access point switch ports in a wireless network Methods and apparatus are disclosed for locating and disabling the switch port of a rogue wireless access point. In one embodiment, a network management device is configured to detect the presence of a rogue access point on a managed wireless network. Once detected,... | 05/06/2008 |
| 7358898 | Method for calibrating an AOA location system for all frequencies in a frequency hopping signal A method for calibrating an antenna and signal processing system enabling angle of arrival (AOA) determination for a frequency hopping signal, in which a calibration coefficient is determined in response to one or more calibration signals injected into the system at... | 04/15/2008 |
| 7348918 | Mobile ballistic missile detection and defense system The present invention is directed towards a ballistic missile detection and defense system. The system of the present invention comprises a ship based interceptor or antiballistic missile, a missile launch detection and tracking system, and a signal processing syste... | 03/25/2008 |
| 7339524 | Analog decorrelation of ranging signals In a local positioning system, a receiver is adapted for receiving signals from a land-based transmitter. The receiver includes an analog decorrelator for decorrelating the transmitted spread spectrum signals. A down converter connected with an antenna may be spaced... | 03/04/2008 |
| 7315275 | Positioning system with intentional multi-path signal A positioning system includes a device, having an antenna and a reflector with a known position proximate to the antenna, that transmits at least an electromagnetic pulse having a carrier signal frequency. The device receives a return signal over a period of time, w... | 01/01/2008 |
| 7307575 | Through-the-wall frequency stepped imaging system utilizing near field multiple antenna positions, clutter rejection and corrections for frequency dependent wall effects Lower resolution and clutter-prone two-tone CW radars can have the displayed images dramatically improved by three techniques involved in the subject invention. The three techniques involved are the stepping of each of the multiple radars for readings at multiple fr... | 12/11/2007 |
| 7304314 | Quantum cross-ambiguity function generator A cross-ambiguity function generator (“CAF”) uses properties of quantum mechanics for computation purposes. The CAF has advantages over standard analog or digital CAF function generators, such as improved bandwidth. The CAF may be used for traditional geolocatio... | 12/04/2007 |
| 7301471 | Communications monitor and control for consumer devices A method and apparatus which provide for simultaneously monitoring and controlling multiple consumer devices located in a fixed and/or mobile environment includes a handheld RF communications device having multiple controls. In addition, a transceiver device is prov... | 11/27/2007 |
| 7295114 | Location management for radio frequency identification readers A Radio Frequency Identification (RFID) system for managing and identifying locations for an RFID reader is disclosed. An expected location of a fixed radio frequency identification (RFID) reader is determined. A first signal is transmitted from the reader to a firs... | 11/13/2007 |
| 7293088 | Tag location, client location, and coverage hole location in a wireless network Determining the location of a radio tag or client station of a wireless network, and the location of coverage holes by receiving from a plurality of wireless stations of the wireless network path loss information of the path loss of one or more location frames recei... | 11/06/2007 |
| 7286515 | Method, apparatus, and software product for detecting rogue access points in a wireless network A method, an apparatus, and a software program to implement a method to detect a rogue access point of a wireless network. The method includes maintaining an AP database that includes information about managed access point (APs) and friendly APs, including the MAC a... | 10/23/2007 |
| 7274332 | Multiple evaluators for evaluation of a purality of conditions A system and method is disclosed for locating people or objects. In particular, a system and method for locating a wireless mobile station using a plurality of mobile station location estimators is disclosed. The system is useful for 911 emergency calls, tracking, r... | 09/25/2007 |
| 7271766 | Satellite and local system position determination In a local positioning system, augmentation of the land-based system is provided by receiving signals from a GNSS. The signals from the land-based positioning system have a code phase accuracy better than one wavelength of a carrier of the signals from the GNSS. Dif... | 09/18/2007 |
| 7271764 | Time of arrival estimation mechanism According to one embodiment, a method is disclosed. The method includes receiving data at a first wireless radio device that has been transmitted from the first wireless radio device, receiving time stamp information from a second first wireless radio device and est... | 09/18/2007 |
| 7269387 | Method and apparatus for determining a distance between a base station and a mobile unit The present invention provides a method and an apparatus for detecting at least one repeater between a base station and a mobile unit. The method includes determining a first estimate of a distance traveled by a signal on a wireless communication link between the ba... | 09/11/2007 |
| 7265710 | Multipath height finding method A method for determining the height HT of a target above a surface, the method comprising the steps of determining a distance R from a source to a target, determining a distance L representative of a distance traveled by a signal from the target that is r... | 09/04/2007 |
| 7257411 | Selective fusion location estimation (SELFLOC) for wireless access technologies In an RF environment serviced by 802.11, Bluetooth(™), or other network transmitters, or combinations, location-estimation methods and systems can advantageously use redundancy to refine an estimated location of an RF receiver. In one embodiment, a method for find... | 08/14/2007 |
| 7256729 | Method for the observation of a number of objects The invention relates to a method for the observation of a number of objects, which move in a space monitored by a number of sensors, are recorded by the sensors and followed with continuous updating of at least the sensor track defining the kinematics of the object... | 08/14/2007 |
| 7250901 | Synthetic aperture radar system and method for local positioning A positioning system includes a passive, isotropic reflecting landmark at a fixed position and a device. The device transmits an electromagnetic pulse having a circular polarization and receives a return signal over a period of time. The return signal includes a ref... | 07/31/2007 |
| 7250906 | Methods and apparatus for identifying asset location in communication networks The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with sig... | 07/31/2007 |
| 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 |
| 7233287 | Method and system for positioning mobile units based on angle measurements A method and system for positioning mobile units using angle measurements taken by neighboring mobile units is disclosed. A selected mobile unit and mobile units in the vicinity of the selected mobile unit are selectively instructed to measure and report information... | 06/19/2007 |
| 7225004 | Mobile communication terminal A mobile phone unit is provided in which a characteristic of an antenna is improved and SAR is reduced without lowering an antenna gain during communication. An antenna 26 (electrical length λ/4), an antenna connection conductive member 22 (electrical... | 05/29/2007 |
| 7212159 | Positioning system, apparatus and method A positioning system, apparatus and method include a transmitter (2), a receiver (4) and a plurality of reflectors (6). A signal is transmitted from transmitter to receiver both directly and via the reflectors (6). A location server (8... | 05/01/2007 |
| 7212160 | Locating an object of interest using back tracked-rays derived from multipath signals Multipath signals (rays) emanating from an object of interest are processed to locate the object. Multipath signals may be accepted, screened, and associated with a specific object by an observer. Information (time, amplitude, and angle information) may be recorded ... | 05/01/2007 |
| 7212798 | Adaptive AGC in a wireless network receiver An apparatus, a carrier medium storing instructions to implement a method, and a method for controlling the gain of a radio receiver for receiving packets of information in a wireless network. The receiver is connected to an antenna subsystem and has receive signal ... | 05/01/2007 |
| 7212204 | System and method for graphics culling A method is disclosed for culling an object database in a graphics processing system. In one embodiment, the method comprises encoding per-object parameters and culling parameters. The per-object parameters are encoded in texture format thereby creating at least one... | 05/01/2007 |
| 7205933 | Hostile platform position location utilizing networked communications The communication system utilizes transmitters that provide communication transmissions having deterministic data. Receivers of the system have the digital processing capability for correlating received transmission reflections of the deterministic data amongst the ... | 04/17/2007 |
