Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 8179316 | Set mode passive location in TOA/TDOA modes The present invention addresses the resolving of the problems associated with the passive location of targets in TOA (Time of Arrival) or TDOA (Time Difference of Arrivals) mode. The method of passively locating a target in TOA or TDOA mode implements a meshing (sub... | 05/15/2012 |
| 8174445 | Method and apparatus for enhanced 911 location using power control in a wireless system Methods of selecting a transmitter power for a mobile telephone include receiving a telephone number and transmitting a control message associated with selection of a transmitter power if the telephone number meets a predetermined criterion. For example, if the tele... | 05/08/2012 |
| 8174446 | Signal path delay determination Propagation time for a target signal path is determined by detecting and processing a plurality of unknown signals received at two locations. A third location is established, such that the propagation time between the third location and one of the two locations is k... | 05/08/2012 |
| 8130146 | Method for measuring the time of arrival of radio signals A method for measuring the time of arrival of radio signals within a network comprises receiving the received signals including at least a first pseudorandom code and a second pseudorandom code from at least one other node; identifying a frequency difference between... | 03/06/2012 |
| 8072382 | Method and apparatus for ADS-B validation, active and passive multilateration, and elliptical surveillance A system and method are disclosed to track aircraft or other vehicles using techniques including multilateration and elliptical surveillance. Unlike conventional approaches that use time difference of arrival for multilateration at a fixed set of reception points, t... | 12/06/2011 |
| 8072383 | Navigation and position determination with a multicarrier modulation signal of opportunity A multicarrier modulation position determination method that includes deploying at least one known receiver with a known location and a second receiver with an unknown location. At least two signals of opportunity with different locations are obtained by both the re... | 12/06/2011 |
| 8026850 | Apparatus and method for computing location of a moving beacon using time difference of arrival and multi-frequencies Provided is an apparatus and method for computing the location of a radio beacon by using Time Difference Of Arrival (TDOA) and multiple frequencies. The apparatus and method of the present invention compute the location of a radio beacon without limitation in dista... | 09/27/2011 |
| 7990317 | Signal path delay determination Propagation time for a target signal path is determined by detecting and processing a plurality of unknown signals received at two locations. A third location is established, such that the propagation time between the third location and one of the two locations is k... | 08/02/2011 |
| 7986270 | Clock phase ranging methods and systems A system and method for estimating the range between two devices performs two or more ranging estimates with subsequent estimates performed using a clock that is offset in phase with respect to a prior estimate. The subsequent estimate allows estimate uncertainties ... | 07/26/2011 |
| 7978136 | Associating a universal time with received signal A method of associating a universal time with time of arrival information of an identified component of a signal at a terminal of a radio positioning system is disclosed. In the method a marker signal with an associated universal time tag is obtained from a timing d... | 07/12/2011 |
| 7924224 | Variable coherence integration for the location of weak signals In a network-based Wireless Location System (WLS), geographically distributed Location Measurement Units (LMUs) must be able to detect and use reverse channel (mobile to network) signals across multiple BTS coverage areas. By using Matched Replica correlation proces... | 04/12/2011 |
| 7889132 | Method and device for travel time-based location identification with the aid of a triggered or self-triggering reference signal A method for the detection of an object by the TDOA principle is provided. The object transmits a signal, which is received by a plurality of stations having known positions. The stations' clocks can have different unknown time delays in relation to each other. An a... | 02/15/2011 |
| 7855682 | Time synchronization A transmitter of a platform is arranged to generate a transmission pulse, which is transmitted to a receiver of another platform and is also arranged to couple its transmission pulse to a digital receiver associated with its platform via an attenuator and a coupler.... | 12/21/2010 |
| 7817091 | Single input multiple output (SIMO) ranging and positioning systems A method estimates a delay in a time of arrival (TOA) of a transmitted signal by receiving the transmitted signal at multiple antennas via corresponding channels. Each received signal is correlated with the transmitted signal to obtain estimated channel coefficients... | 10/19/2010 |
| 7804448 | Portable, iterative geolocation of RF emitters Iterative geolocation of a stationary RF emitter through the use of TDOA may include the use of a single portable geolocation (e.g., TDOA) sensor, a pair of portable geolocation sensors and three of more portable geolocation sensors. Adding portable geolocation sens... | 09/28/2010 |
| 7710320 | System and method for position determination by impulse radio A method for producing a first time base for a first ultra wideband radio obtains a time reference signal and phase locks a clock signal to the time reference signal The clock signal is counted down using a counter to produce the first time base. The counter is a bi... | 05/04/2010 |
| 7663547 | Determining a geolocation solution of an emitter on earth based on weighted least-squares estimation Embodiments provide systems and methods for determining the geolocation of an emitter on earth based on weighted least-squares estimation based on two TDOA and two FDOA measurements, none of which need to be acquired at the same time. The four TDOA and FDOA measurem... | 02/16/2010 |
| 7616155 | Portable, iterative geolocation of RF emitters Iterative geolocation of a stationary RF emitter through the use of TDOA may include the use of a single portable geolocation (e.g., TDOA) sensor, a pair of portable geolocation sensors and three of more portable geolocation sensors. Adding portable geolocation sens... | 11/10/2009 |
| 7609207 | System and method for performing time difference of arrival location without requiring a common time base or clock calibration A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a packet transmitted from a reference wireless device (first wireless device... | 10/27/2009 |
| 7545325 | Method of signal processing The present invention is a method of finding propagation time and velocity of a transmitter. Specifically, receiving a signal at two or more receivers and using the scalar time relationship to determine propagation time and velocity of the transmitter for the purpos... | 06/09/2009 |
| 7525483 | Receive device and method for receiving a receive sequence A receive device for determining a location of a transmitter device includes an evaluator formed to determine a first location of the transmitter device from a time of arrival of a first receive sequence, and a second location of the transmitter device from a time o... | 04/28/2009 |
| 7508344 | Systems and methods for TDOA/FDOA location Systems and methods that may be implemented to determine the location of an emitter of electromagnetic radiation, such as an RF signal emitter having an unknown location, using at least two electromagnetic radiation sensor antennas that are co-located on a single se... | 03/24/2009 |
| 7477191 | System and method for performing time difference of arrival location without requiring a common time base or clock calibration A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a packet transmitted from a reference wireless device (first wireless device... | 01/13/2009 |
| 7468696 | Method and device for trilateration using LOS link prediction and pre-measurement LOS path filtering A method for trilateration may include receiving a signal via each of a plurality of LOS paths and predicting performance of each LOS path. The method may also include filtering out signals received via LOS paths with performance below a predetermined threshold valu... | 12/23/2008 |
| 7443342 | Reception time determining apparatus and distance measuring apparatus using the same The invention provides a reception time determining apparatus which can measure reception time to a high accuracy, without expanding an occupied bandwidth, and a distance measuring apparatus which uses the reception time determining apparatus. There is provid... | 10/28/2008 |
| 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 |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7411551 | System and method for asynchronous wireless positioning by ordered transmission Disclosed is a wireless positioning system and method that can perform a high-precision position tracking. The wireless positioning system includes a target device that is an object of wireless positioning, beacon devices and a processing unit. The beacon devices tr... | 08/12/2008 |
| 7411548 | Reference beacon identification using transmission sequence characteristics A method and apparatus for encoding information in a reference beacon signal for use in a time-difference-of-arrival/frequency-difference-of-arrival (TDOA/FDOA) geolocation system. Information is encoded in the reference beacon signal using variations in the times a... | 08/12/2008 |
| 7403157 | Radio ranging using sequential time-difference-of-arrival estimation A method determines a position of a target object. A window function is applied repeatedly to a first signal and a second signal of a pair of radio signals received at a pair of passive sensors from a target object while time shifting the window function during a co... | 07/22/2008 |
| 7391368 | Determining the time of arrival of a wireless signal In an example embodiment, a time of arrival circuit coupled to a wireless transceiver configured to determine a time of arrival of a wireless signal. The time of arrival circuit is operative to perform a coarse-scale frequency domain correlation of the actual sample... | 06/24/2008 |
| 7392015 | Calibration methods and structures in wireless communications systems Calibration methods and structures are provided for wireless communications devices that compensate across a signal bandwidth for relative gain and phase errors between spatial communication channels while utilizing existing transceiver structures and facilitating t... | 06/24/2008 |
| 7379744 | Positioning system, positioning method, and positioning server To provide a positioning system, a positioning method, and a positioning server, which are capable of improving accuracy in detection of a position. In a positioning system, three or more access points connected to a terminal station by wireless communication are co... | 05/27/2008 |
| 7375683 | Use of geo-stationary satellites to augment wide area multilateration synchronization The present invention improves WAMLAT Timing Availability by using timing from one or more of a variety of sources. These sources include unaugmented SATNAV timing, from GPS or/and GALILEO, GEO timing from pseudo SATNAV signals, additional GEO timing for non SATNAV ... | 05/20/2008 |
| 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 |
| 7369599 | Method and apparatus for reducing code phase search space A GPS communication system including a server and a client, each including a GPS receiver, for reducing the code phase search space of the GPS receiver of the client. The communication system includes a transmitter for transmitting timing information from the server... | 05/06/2008 |
| 7366492 | Method and system for mobile location detection using handoff information Methods and systems for mobile station location detection. A mobile station measures signal strength of each of a set of signals associated with the mobile station, then determines whether a number of signals in the set is less than a predetermined threshold. Based ... | 04/29/2008 |
| 7366675 | Methods and apparatus for increasing, monitoring and/or rewarding a party's compliance with a schedule for taking medicines Methods and apparatus are provided for increasing and/or for monitoring a party's compliance with a schedule for taking medicines. In a first embodiment, a method is provided that includes receiving information regarding whether at least two medicine containers were... | 04/29/2008 |
| 7365682 | System and method for distributed signal compression for cooperative geolocation A cooperative geolocation system and method. The system and method involves time stamping a plurality of received signals and modifying, such as compressing, one or more of the received signals, either with the same or with different rates of compression. A processi... | 04/29/2008 |
| 7363137 | Construction equipment discovery on a network Systems and methodologies that facilitate a search for construction equipment(s) (e.g., a welding terminal) via a locator component that searches a networked area as defined by a plurality of reference points. Upon locating a network address of the construction unit... | 04/22/2008 |
