11
Robert J Anderson, Louis A Stilp, Matthew L Ward: Multiple pass location processor. TruePosition, Woodcock Washburn, March 29, 2005: US06873290 (118 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 ...


12
Louis A Stilp, Joseph W Sheehan, Tim J Harris, Jeffrey F Bull, Robert J Anderson: Architecture for a signal collection system of a wireless location system. TruePosition, Woodcock Washburn Kurtz Mackiewicz & Norris, July 24, 2001: US06266013 (112 worldwide citation)

A signal collection system (SCS) for use in a Wireless Location System is disclosed. The SCS performs wideband energy detection and reporting at the front end of the SCS receiver. Other aspects of the SCS include a protocol for efficiently setting levels for wideband energy detection, DSP sharing wi ...


13
Louis A Stilp, Joseph W Sheehan, Alan E E Rogers, Robert J Anderson: Collision recovery in a wireless location system. TruePosition, Massachusetts Institute of Technology, Woodcock Washburn, May 13, 2003: US06563460 (109 worldwide citation)

A collision recovery method for use in a Wireless Location System includes receiving a transmission from a wireless transmitter at multiple signal collection systems and multiple antenna ports of each of the multiple signal collection systems. At each of the multiple signal collection systems, the t ...


14
Louis A Stilp, Joseph W Sheehan, Jeffrey F Bull, Robert J Anderson: Signal collection system for a wireless location system. TruePosition, Woodcock Washburn, May 14, 2002: US06388618 (108 worldwide citation)

A signal collection system (SCS) is used in a wireless location system that determines the geographical locations of mobile wireless transmitters. The SCS includes a first receiver module, a first digital signal processing (DSP) module, a control and communications module, a timing signal generator ...


15
Louis A Stilp, Joseph W Sheehan, Alan E E Rogers, Robert J Anderson: Station based processing method for a wireless location system. TruePosition, Massachusetts Institute of Technology, Woodcock Washburn Kurtz Mackiewicz & Norris, September 4, 2001: US06285321 (107 worldwide citation)

A station-based method for use in a wireless location system determines the geographic location of a mobile wireless transmitter. The wireless location system includes signal collection systems and location processors for processing digital data provided by the signal collection systems. The station ...


16
Robert J Anderson: Automatic synchronous tuning of narrowband receivers of a wireless location system for voice/traffic channel tracking. TruePosition, Woodcock Washburn, November 11, 2003: US06646604 (104 worldwide citation)

In a wireless location system, narrowband receivers are used in a mode, known as automatic synchronous or sequential tuning, in which the receivers are tuned sequentially and in unison to a plurality of predefined RF channels. Signal transmissions of interest in these channels are digitally recorded ...


17
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 Institute of Technology, Woodcock Washburn, December 9, 2003: US06661379 (103 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 ...


18
Louis A Stilp, Joseph W Sheehan, Alan E E Rogers, Robert J Anderson, Andrew F Harbison: Baseline selection method for use in a wireless location system. TruePosition, Massachusetts Institute of Technology, Woodcock Washburn, November 19, 2002: US06483460 (102 worldwide citation)

A Wireless Location System includes signal collection systems and location processors for processing digital data provided by the signal collection systems. To determine the geographic location of a mobile wireless transmitter, time difference of arrival, or TDOA, data is determined with respect to ...


19
Robert J Anderson: System and method for interference cancellation in a location calculation, for use in a wireless location system. TruePosition, Woodcock Washburn, July 20, 2004: US06765531 (101 worldwide citation)

In a Wireless Location System, reception and demodulation of signals is often performed at many sites. A collision may occur, e.g., in a TDMA, AMPS, GSM, GPRS, EDGE, CDMA, CDMA 2000, or WCDMA system, when a signal of interest (a transmission from a mobile transmitter to be located) and an interferin ...


20
Louis A Stilp, Robert J Anderson, Joseph W Sheehan: Modified transmission method for improving accuracy for E-911 calls. TruePosition, Woodcock Washburn, February 11, 2003: US06519465 (93 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 ...