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, 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 ...


5
Louis A Stilp, Curtis A Knight, John C Webber: System for locating a source of bursty transmissions cross reference to related applications. Associated RT, Woodcock Washburn Kurtz Mackiewicz & Norris, March 4, 1997: US05608410 (199 worldwide citation)

A system for determining the location of a mobile transmitter is disclosed. The mobile transmitter receives a message signal and responds to the message signal by transmitting a responsive signal, wherein the responsive signal is indicative of the identity of the mobile transmitter. One preferred em ...


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
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 ...


10
Louis A Stilp, Joseph W Sheehan, Alan E E Rogers, Robert J Anderson, Andrew F Harbison: Antenna selection method for a wireless location system. TruePosition, Massachusetts Insitute of Technology, Woodcock Washburn, June 4, 2002: US06400320 (130 worldwide citation)

An antenna selection method is used in a wireless location system that determines the geographic location of a mobile wireless transmitter. The wireless location system includes signal collection systems connected to multiple antennas at a plurality of cell sites and a location processor for process ...