Patent application number | Description | Published |
20090079623 | METHOD AND APPARATUS FOR GEOLOCATION DETERMINATION - The disclosure relates to method and apparatus for geolocation determination. In one embodiment, the disclosure relates to a method for detecting an erroneous satellite measurement by a receiver, including the steps of (a) determining an approximate location of the receiver; (b) for each of a plurality of satellites from which the receiver receives a signal: (i) determining a range difference between an expected range between the receiver and the satellite and a measured range between the receiver and the satellite; (ii) determining a median value of the range differences; (iii) determining an offset value between the range difference and the median value; (iv) comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement. | 03-26-2009 |
20090085802 | METHOD AND APPARATUS FOR GEOLOCATION DETERMINATION - The disclosure relates to method and apparatus for geolocation determination. In one embodiment, the disclosure relates to a method for detecting an erroneous satellite measurement by a receiver, including the steps of (a) determining an approximate location of the receiver; (b) for each of a plurality of satellites from which the receiver receives a signal: (i) determining a range difference between an expected range between the receiver and the satellite and a measured range between the receiver and the satellite; (ii) determining a median value of the range differences; (iii) determining an offset value between the range difference and the median value; (iv) comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement. | 04-02-2009 |
20090146872 | METHOD AND SYSTEM FOR PROVIDING ASSISTANCE DATA FOR A-GPS LOCATION OF HANDSETS IN WIRELESS NETWORKS - A system and method for determining the location of a wireless device. A boundary for an approximate area in which the wireless device is located is determined and a plurality of satellites may be determined as a function of the boundary. Assistance data is transmitted to the device which includes information from the plurality of satellites, and the location of the wireless device may be determined from the information. In one embodiment, if the number of the plurality of satellites is greater than a predetermined threshold then the number of satellites may be reduced as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite. | 06-11-2009 |
20090146876 | SYSTEM AND METHOD FOR A-GPS POSITIONING OF A MOBILE DEVICE - A system and method for estimating the position of a mobile device using information from a constellation of satellites. A first set of satellites of the constellation may be selected and then a second set of satellites of the constellation may be selected as a function of signals received from the first set of satellites. Data may be transmitted to the mobile device based on signals received from the second set of satellites, and a location of the device estimated based on the data. One embodiment may select the second set as a function of an intersection of coverage areas of ones of the first set of satellites. Another embodiment may select the second set as a function of one or more satellites that are not occluded by the Earth from one or more of the first set of satellites. | 06-11-2009 |
20090146877 | SYSTEM AND METHOD FOR PREVENTING A-GPS DEVICES FROM SEARCHING FOR SPECIFIC SATELLITES - A system and method for estimating the location of a wireless device. A set of satellites may be determined as a function of an approximate area in which the wireless device is located. Assistance data is transmitted to the device including information from the set of satellites, and a location of the device may be estimated from the information where the assistance data prevents the wireless device from searching for signals from one or more satellites in the set of satellites. The one or more satellites may be an operable satellite but signals therefrom cannot be measured or acquired by the wireless device. | 06-11-2009 |
20090146878 | SYSTEM AND METHOD FOR POSITION CALCULATION OF A MOBILE DEVICE - A system and method for determining a location of a device. Plural signals from a first plurality of satellites may be received a the device where an estimated location of the device is determined as a function of frequency information from the signals. A location of the device may then be determined as a function of the estimated location and/or as a function of phase information from the signals. A second plurality of satellites may also be determined as a function of any one of the determined locations. In such embodiments, assistance data may be transmitted to the device that includes information from the second plurality of satellites. Another location of the device may then be determined from this information. | 06-11-2009 |
20100123622 | SYSTEM AND METHOD FOR DETERMINING THE LOCATION OF A MOBILE DEVICE - A system and method for determining the location of a mobile device. A first set of signals from a plurality of radio frequency (“RF”) sources may be received at a mobile device and then downconverted into a second set of signals. The mobile device may then time stamp the second set of signals and transmit the time stamped signals to a location determining system. The location of the mobile device may be determined at the location determining system as a function of the time stamped signals. | 05-20-2010 |
20100127920 | SYSTEM AND METHOD FOR DETERMINING FALSIFIED GEOGRAPHIC LOCATION OF A MOBILE DEVICE - A system and method for determining whether an estimated location of a wireless device includes one or more forged satellite measurements. An estimated location of the wireless device may be determined from signals received from a first set of satellites, and a set of residuals obtained as a function of the estimated location. The obtained set of residuals may then be compared to a reference set of residuals. If the comparison between the obtained set and reference set of residuals is less than a predetermined threshold, then the estimated location may be identified as having one or more forged satellite measurements. | 05-27-2010 |
20100127928 | SYSTEM AND METHOD FOR SERVER SIDE DETECTION OF FALSIFIED SATELLITE MEASUREMENTS - A system and method for determining whether a wireless device has transmitted one or more forged satellite measurements. An estimated location of the wireless device may be determined as a function of information from a cellular network. Acquisition assistance data may be determined for a first set of satellites as a function of the estimated location, the assistance data including an uncertainty window. If measured code phase information in the satellite measurements substantially correlates to the uncertainty window, then the wireless device may be transmitting forged satellite measurements. | 05-27-2010 |
20100156704 | Method and Apparatus for Determining the Geographic Location of a Device - A method and apparatus for determining the location of a device from signals provided by a plurality of satellites. A device receives a first plurality of signals comprising one signal from each of a first plurality of satellites and determines a first location of the device as a function of the first plurality of signals. The device then determines a second location thereof as a function of a second plurality of signals if the first location is not within a predetermined threshold. The second plurality of signals is a first subset of the first plurality of signals. | 06-24-2010 |
20100156707 | Method and Apparatus for Determining the Geographic Location of a Device - A method and apparatus for determining the location of a device from signals provided by a plurality of satellites. A device receives a first plurality of signals comprising one signal from each of a first plurality of satellites and determines a first location of the device as a function of the first plurality of signals. The device then determines a second location thereof as a function of a second plurality of signals if the first location is not within a predetermined threshold. The second plurality of signals is a first subset of the first plurality of signals. | 06-24-2010 |
20100156713 | SYSTEM AND METHOD FOR DETERMINING A REFERENCE LOCATION OF A MOBILE DEVICE - A system and method for determining a reference location of a wireless device wherein a location request may be received for the wireless device where the location request fails to identify an approximate location for the wireless device. A reference location may be determined for the wireless device, the reference location selected from the group consisting of: an area defined as a function of at least one of a mobile country code, mobile network code, and/or a location area code; an area defined by a mapping of a provided Internet protocol address to a location; an area determined as a function of a position information element in the location request; a default area; and combinations thereof. | 06-24-2010 |
20100171655 | METHOD AND SYSTEM FOR SELECTING OPTIMAL SATELLITES FOR A-GPS LOCATION OF HANDSETS IN WIRELESS NETWORKS - A system and method for determining a set of satellites for which assistance data may be provided to a wireless device. A boundary for an approximate area in which the wireless device is located may be determined and one or more sets of satellites may be determined as a function of the boundary. An optimum set of satellites from the one or more sets of satellites may then be determined using a satellite selection function on the one or more sets of satellites at predetermined points substantially on the boundary. | 07-08-2010 |
20100231448 | METHOD AND SYSTEM FOR SELECTING OPTIMAL SATELLITES IN VIEW - A system and method for determining one or more satellites in view of a wireless device. A request for satellite assistance data may be received from a requesting entity and a reference location determined as a function of the request. A set of satellites may be determined as a function of the reference location. Subsequent cached information may be determined for each satellite in the set of satellites if cached information already existing for each satellite in the set of satellites has been cached for greater than a predetermined time period. This subsequent cached information may then replace the previously existing cached information for the reference location. One or more satellites in view of the wireless device may then be determined as a function of either the subsequent cached information or previously existing cached information, and assistance data may be provided to the requesting entity to determine an estimated location of the wireless device. | 09-16-2010 |
20100238070 | SYSTEM AND METHOD FOR CONCURRENTLY DETERMINING LOCATIONS OF MOBILE DEVICE IN WIRELESS COMMUNICATION NETWORK - A method for a mobile location center (MLC) to determine a location of a mobile device in a wireless communication network includes receiving a request to determine the location of the mobile device; concurrently requesting global navigation satellite system (GNSS) measurements from the mobile device and terrestrial measurements from transceivers in the wireless communication network, and receiving the GNSS measurements and at least one of the terrestrial measurements. A GNSS location of the mobile device is calculated as a function of the GNSS measurements, and the calculated GNSS location is determined to be the location of the mobile device when the calculated GNSS location meets a predetermined accuracy threshold. A terrestrial location of the mobile device is calculated as a function of the terrestrial measurements, and the calculated terrestrial location is determined to be the location of the mobile device when the calculated terrestrial location meets the predetermined accuracy threshold. | 09-23-2010 |
20100240389 | SYSTEM AND METHOD FOR LOCATING MOBILE DEVICE IN WIRELESS COMMUNICATION NETWORK - A method is provided for determining a location of a mobile device in a wireless network. The method includes receiving global navigation satellite system (GNSS) measurements from the mobile device, and receiving terrestrial measurements from corresponding transceivers in the wireless network, each terrestrial measurement indicating a distance between the corresponding transceivers and the mobile device. The method further includes selecting at least one terrestrial measurement having an uncertainty value within a predetermined accuracy threshold. The location of the mobile device is determined as a function of the GNSS measurements and the selected terrestrial measurement. | 09-23-2010 |
20100285813 | SYSTEM AND METHOD FOR DETERMINING A REFERENCE LOCATION USING CELL TABLE DATA MINING - A system and method for providing assistance data to a wireless device. A location request may be received for the wireless device, the location request identifying location information for the wireless device. A reference location for the wireless device may then be determined as a function of a comparison of the location information and a region determined as a function of at least one of a mobile country code (“MCC”), mobile network code (“MNC”), and an Area-Identification (“Area-ID”), such as a location area code (“LAC”) or a Radio Network Controller-Identification (“RNC-ID”). Assistance data may be provided to the wireless device as a function of the determined reference location. | 11-11-2010 |
20100302098 | System and Method for A-GPS Positioning of a Mobile Device - A system and method for estimating the position of a mobile device using information from a constellation of satellites. A first set of satellites of the constellation may be selected and then a second set of satellites of the constellation may be selected as a function of signals received from the first set of satellites. Data may be transmitted to the mobile device based on signals received from the second set of satellites, and a location of the device estimated based on the data. One embodiment may select the second set as a function of an intersection of coverage areas of ones of the first set of satellites. Another embodiment may select the second set as a function of one or more satellites that are not occluded by the Earth from one or more of the first set of satellites. | 12-02-2010 |
20100328148 | Method and System for Providing Assistance Data for A-GPS Location of Handsets in Wireless Networks - A system and method for determining the location of a wireless device. A boundary for an approximate area in which the wireless device is located is determined and a plurality of satellites may be determined as a function of the boundary. Assistance data is transmitted to the device which includes information from the plurality of satellites, and the location of the wireless device may be determined from the information. In one embodiment, if the number of the plurality of satellites is greater than a predetermined threshold then the number of satellites may be reduced as a function of one or more of the elevation of each satellite above the horizon, a distance between each satellite to one or more other satellites, and an altitude of each satellite. | 12-30-2010 |
20120007774 | METHOD AND SYSTEM FOR SELECTING OPTIMAL SATELLITES IN VIEW - A system and method for determining one or more satellites in view of a wireless device. A request for satellite assistance data may be received from a requesting entity and a reference location determined as a function of the request. A set of satellites may be determined as a function of the reference location. Subsequent cached information may be determined for each satellite in the set of satellites if cached information already existing for each satellite in the set of satellites has been cached for greater than a predetermined time period. This subsequent cached information may then replace the previously existing cached information for the reference location. One or more satellites in view of the wireless device may then be determined as a function of either the subsequent cached information or previously existing cached information, and assistance data may be provided to the requesting entity to determine an estimated location of the wireless device. | 01-12-2012 |
20120026037 | SYSTEM AND METHOD FOR SERVER SIDE DETECTION OF FALSIFIED SATELLITE MEASUREMENTS - A system and method for determining whether a wireless device has transmitted one or more forged satellite measurements. An estimated location of the wireless device may be determined as a function of information from a cellular network. Acquisition assistance data may be determined for a first set of satellites as a function of the estimated location, the assistance data including an uncertainty window. If measured code phase information in the satellite measurements substantially correlates to the uncertainty window, then the wireless device may be transmitting forged satellite measurements. | 02-02-2012 |
20120154220 | System and Method for Determining the Location of a Mobile Device - A system and method for determining the location of a mobile device. A first set of signals from a plurality of radio frequency (“RF”) sources may be received at a mobile device and then downconverted into a second set of signals. The mobile device may then time stamp the second set of signals and transmit the time stamped signals to a location determining system. The location of the mobile device may be determined at the location determining system as a function of the time stamped signals. | 06-21-2012 |
20120169533 | SYSTEM AND METHOD FOR LOCATING MOBILE DEVICE IN WIRELESS COMMUNICATION NETWORK - A method is provided for determining a location of a mobile device in a wireless network. The method includes receiving global navigation satellite system (GNSS) measurements from the mobile device, and receiving terrestrial measurements from corresponding transceivers in the wireless network, each terrestrial measurement indicating a distance between the corresponding transceivers and the mobile device. The method further includes selecting at least one terrestrial measurement having an uncertainty value within a predetermined accuracy threshold. The location of the mobile device is determined as a function of the GNSS measurements and the selected terrestrial measurement. | 07-05-2012 |