1
Louis A Stilp, Robert J Anderson, Matthew L Ward: Applications processor including a database system, for use in a wireless location system. TruePosition, Woodcock Washburn, September 18, 2007: US07271765 (284 worldwide citation)

An Applications Processor (14) including a centralized database system is used in a wireless location system (WLS). The APs 14 may be used to manage resources in the WLS, including signal collection systems (SCSs 10) and TDOA location processors (TLPs 12). Each AP 14 contains a database containing t ...


2
Louis A Stilp: Calibration for wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, February 6, 2001: US06184829 (276 worldwide citation)

Methods and apparatus for calibrating a Wireless Location System to enable the system to make highly accurate TDOA and FDOA measurements are disclosed. An external calibration method in accordance with the present invention comprises the steps of transmitting a first reference signal from a referenc ...


3
Louis A Stilp: Method and system for synchronizing receiver systems of a wireless location system. TruePosition, Woodcock Washburn, February 26, 2002: US06351235 (237 worldwide citation)

In a wireless location system (WLS) including a plurality of geographically separated receiver systems, a system for synchronizing the respective receiver systems includes the use of an enhanced GPS receiver including a mechanism for receiving GPS signals and removing at least a portion of the timin ...


4
Robert J Anderson: Monitoring of call information in a wireless location system. TruePosition, Woodcock Washburn, August 24, 2004: US06782264 (211 worldwide citation)

In an overlay Wireless Location System, an Abis interface is monitored to obtain information used to locate GSM phones. Signaling links of the Abis interface are passively monitored to obtain certain information, such as control and traffic channel assignment, called number, and mobile identificatio ...


5
Robert J Anderson, Alan E E Rogers, Louis A Stilp: Method for estimating TDOA and FDOA in a wireless location system. TruePosition, Massachusetts Institute of Technology, Woodcock Washburn, April 5, 2005: US06876859 (210 worldwide citation)

A method, used in locating a mobile transmitter, includes providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimate and is produced by cross-correlating a reference signal with a cooperating signal. The reference si ...


6
Louis A Stilp, Joseph W Sheehan, Alan E E Rogers, Robert J Anderson, Vineet Sachdev: Mobile-assisted network based techniques for improving accuracy of wireless location system. TruePosition, Massachusetts Institute of Technology, Woodcock Washburn, October 8, 2002: US06463290 (180 worldwide citation)

The accuracy of the location estimate of a Wireless Location System is dependent, in part, upon both the transmitted power of the wireless transmitter and the length in time of the transmission from the wireless transmitter. In general, higher power transmissions and transmissions of greater transmi ...


7
Louis A Stilp, Robert J Anderson, Matthew L Ward: Multiple pass location processor. Trueposition, Woodcock Washburn, April 4, 2006: US07023383 (165 worldwide citation)

A multiple pass location processing method, for use in a wireless location system (WLS), comprises identifying a received transmission as requiring multiple pass location processing whereby the WLS produces a first, lower quality location estimate and then subsequently produces a second, higher qual ...


8
Michael John Kovach Jr, Anthony Richard Brigidi, John Solley, Edwin E McCook, Robert J Anderson, Vineet Sachdev, Thomas Ginter, Joseph W Sheehan, Louis A Stilp: Centralized database system for a wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, November 13, 2001: US06317604 (153 worldwide citation)

A centralized database system is used in a wireless location system that determines the geographical locations of mobile wireless transmitters, the wireless location system including signal collection systems, location processors for processing digitized RF data provided by the signal collection sys ...


9
Robert J Anderson: Monitoring of call information in a wireless location system. TruePosition, Woodcock Washburn, January 23, 2007: US07167713 (145 worldwide citation)

In an overlay Wireless Location System, an Abis interface is monitored to obtain information used to locate GSM phones. Signaling links of the Abis interface are passively monitored to obtain certain information, such as control and traffic channel assignment, called number, and mobile identificatio ...


10
Louis A Stilp, Charles C Counselman III: Bandwidth synthesis for wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, July 18, 2000: US06091362 (145 worldwide citation)

A wireless location system receives signals transmitted by wireless telephones at a plurality of signal collection sites. To improve the accuracy of the location information, the system synthesizes greater bandwidth, and thus greater time resolution, than would otherwise be available. The location s ...