1
Louis A Stilp: Calibration for wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, February 6, 2001: US06184829 (227 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 ...


2
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 (213 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 ...


3
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 (193 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 ...


4
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 (191 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 ...


5
Louis A Stilp: Method and system for synchronizing receiver systems of a wireless location system. TruePosition, Woodcock Washburn, February 26, 2002: US06351235 (186 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 ...


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 (164 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 (139 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 (133 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 (127 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: Method for improving the accuracy of a wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, August 1, 2000: US06097336 (122 worldwide citation)


A method for locating a mobile transmitter comprises the steps of (a) making a first estimate of the location of the mobile transmitter on the basis of a first transmission from the mobile transmitter; (b) causing the mobile transmitter to emit a second transmission; (c) making a second estimate of ...



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