Patents by Inventor Alison K. Brown

Alison K. Brown has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6727846
    Abstract: A digital GPS receiver includes electronics to detect the presence of multipath GPS signals, determine the direction from which they are received at a multi-element GPS phased array antenna, adaptively generate an antenna pattern to provide gain in the direction of the desired GPS satellite signal, and to apply nulls in the direction of the detected GPS multipath signals. This adaptively-generated antenna pattern is applied to the signals received at the elements of the GPS phased array antenna to provide a composite signal to each of the processing channels of the digital GPS receiver, optimized for the particular GPS satellite being tracked by a corresponding channel.
    Type: Grant
    Filed: September 20, 2000
    Date of Patent: April 27, 2004
    Assignee: Navsys Corporation
    Inventor: Alison K. Brown
  • Patent number: 6246369
    Abstract: A miniature phased array antenna system employs a substrate having a high dielectric constant. A plurality of antenna elements are located on a surface of the substrate, and a superstrate having a high dielectric constant covers the antenna elements. The dielectric constant, thickness, and shape of the superstrate enable it to act as a dielectric lens for controlling the phase relationship of a signal received by the antenna elements. The design of the superstrate dielectric lens permits a reduction in the physical spacing between the antenna elements while maintaining spatial diversity in phase between signals arriving from different directions. Thus, the antenna array may be significantly smaller than conventional phased array antennas while maintaining a similar phase relationship to that achieved using conventional phased array antennas.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: June 12, 2001
    Assignee: NAVSYS Corporation
    Inventors: Alison K. Brown, Peter K. Brown, Amir H. Matini, John D. Norgard
  • Patent number: 6157621
    Abstract: The Satellite Communication System disclosed in the specification is a dynamic constellation (C) of satellites (S). The present invention is capable of offering continuous voice, data and video service to customers across the globe on the land, on the sea, or in the air. The preferred embodiment of the invention comprises a low Earth orbit satellite system that includes 40 spacecraft (S) traveling in each of 21 orbital planes at an altitude of 700 km (435 miles). This relatively large number of satellites employed by the preferred embodiment was selected to provide continuous coverage of the Earth's surface at a high minimum mask angle (1230a) of forty degrees. Each of the individual 840 spacecraft (S) functions as an independent sovereign switch of equal rank which knows the position of its neighbors, and independently handles traffic without ground control.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: December 5, 2000
    Assignee: Teledesic LLC
    Inventors: Alison K. Brown, Edward Fenton Tuck, David Palmer Patterson, Douglas Gene Lockie, Vilnis G. Grencions, Asu Ram Jha, Donald A. Ashford, Mark Alan Sturza, James R. Stuart, Moshe Lerner Liron, H. Beat Wackernagel, deceased
  • Patent number: 5379224
    Abstract: A low cost tracking system employing satellites of the global positioning system (GPS) is suitable for applications involving radiosondes, sonobuoys, and other objects. The tracking system includes a sensor mounted on each object which digitally samples the GPS satellite signals and records them in a data buffer. The digital samples are then transmitted, at a rate lower than that at which the GPS satellite signals were sampled, over a data telemetry link, interleaved with other telemetry data from the object. The GPS data is processed in a data processing workstation where the position and velocity of the sensor, at the time the data was sampled, is computed. The data buffer in the sensor is periodically refreshed, and the workstation periodically computes the new position and velocity of the sensor. Differential corrections are also provided at the workstation to aid in signal acquisition and to increase the precision of the position fix.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: January 3, 1995
    Assignee: NAVSYS Corporation
    Inventors: Alison K. Brown, Mark A. Sturza
  • Patent number: 5311194
    Abstract: A GPS precision approach and landing system for aircraft employs a fixed ground facility and a single satellite navigation receiver on board the aircraft. The fixed ground facility includes a reference receiver that measures differential corrections to the satellite code and carrier measurements and a pseudolite that is employed to transmit these corrections to a broadband GPS receiver on board the aircraft and to provide an additional code and carrier measurement to assist in the navigation solution. The pseudolite signal is broadcast at a frequency offset from the L1 GPS frequency in order to prevent interference with the satellite navigation system. The broadband GPS receiver on board the aircraft is capable of making phase coherent measurements from the GPS satellites, the pseudolite signal, and the GLONASS satellites.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: May 10, 1994
    Assignee: NAVSYS Corporation
    Inventor: Alison K. Brown
  • Patent number: 5225842
    Abstract: A tracking system employing global positioning system (GPS) satellites provides extremely accurate position, velocity, and time information for vehicles or any other animate or inanimate object within any mobile radio communication system or information system, including those operating in high rise urban areas. The tracking system includes a sensor mounted on each object, a communication link, a workstation, and a GPS reference receiver. The sensor operates autonomously following initialization by an external network management facility to sequence through the visible GPS satellites, making pseudo range and delta range or time difference and frequency difference measurements. No navigation functions are performed by the sensor, thereby permitting significant reductions in the cost thereof. The raw satellite measurements, with relevant timing and status information, are provided to the communication link to be relayed periodically back to the workstation.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: July 6, 1993
    Assignee: NAVSYS Corporation
    Inventors: Alison K. Brown, Mark A. Sturza
  • Patent number: 4862178
    Abstract: A codeless digital method and apparatus for obtaining measured phase from a plurality of L2 signal transmissions. An intermediate frequency signal is derived by mixing the L2 transmissions with a local oscillator. That signal is hardlimited and employed to terminate the count of a divide-by-32 counter that is clocked by the local oscillator signal and initiated by a signal in synchronization therewith whose frequency is a fraction of the local oscillator. The state of the counter is applied to a four bit latch. The state of the latch, which effectively discards the most significant bit of the count, provides the measured phase of the L2 transmissions from which position can be obtained by reference to the satellite phase and delta range values derived therefrom.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: August 29, 1989
    Assignee: Litton Systems, Inc.
    Inventors: Mark A. Sturza, Alison K. Brown
  • Patent number: 4754280
    Abstract: An attitude sensing system which incorporates the precision in attitude sensing of a satellite navigation system with the dynamic tracking capabilities of an inertial measurement unit. Optimally estimated attitude and system error signals are combined with the outputs of an inertial measurement unit to control the phase differences of signals received on an interferometer array from a navigation satellite. The outputs from the inertial measurement unit and the phase differences are processed in an optimal estimator filter to produce periodically updated attitude and system error signals. This permits inertial attitude sensing to benefit from the long term accuracy of attitude estimation based upon signals from the satellite navigation system.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: June 28, 1988
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Alison K. Brown, W. Michael Bowles, Tom P. Thorvaldsen
  • Patent number: 4634283
    Abstract: The use of a high speed moving average filter is shown to filter high speed errors, including white noise in angle and quantization errors, from the output data of a ring laser gyro while it is being tested. The filtered data permits investigation of the lower speed, random walk in angle error of the gyro being tested. For best results, several moving average filters are connected in series.
    Type: Grant
    Filed: March 19, 1984
    Date of Patent: January 6, 1987
    Assignee: Litton Systems, Inc.
    Inventors: John G. Mark, Alison K. Brown, Anthony Matthews