Patents Represented by Attorney Henry S. Huff

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  • Virtual ATCRBS using signals of remote SSR
    Patent number: 4899156
    Abstract: A virtual secondary surveillance radar (SSR) of the type described in U.S. Pat. No. 4,115,771 can produce inaccurate or indeterminate range information for a transponder positioned near or on a line between the actual SSR and the virtual SSR, owing to unfavorable geometrical relationships. When such condition occurs, the error or ambiquity is resolved by transmitting interrogations from the virtual SSR site toward the actual SSR. The time delay between transmission of an interrogation and reception of a reply to it is a direct measure of the range of the transponder from the virtual SSR.
    Type: Grant
    Filed: July 13, 1989
    Date of Patent: February 6, 1990
    Assignee: Litchstreet Company
    Inventors: George B. Litchford, Burton L. Hulland
  • Collision avoidance system
    Patent number: 4789865
    Abstract: The operation of a positive finding collision avoidance system at an Own station that determines Own's and Others' positions from SSR interrogations and replies thereto is initialized by briefly transmitting interrogations from Own station and receiving non-garbled replies thereto from Other stations to determine their direct ranges from Own. The range data is used in a trigonometric computation to obtain Own's and such Others' initial positions. Interference with the normal operation of the standard ATCRBS is limited to a minimum by transmitting from Own very briefly and only when necessary. The distance between pairs of SSRs is also computed.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: December 6, 1988
    Assignee: Litchstreet Co.
    Inventor: George B. Litchford
  • Collision avoidance system
    Patent number: 4768036
    Abstract: A position-finding collision avoidance system (CAS) at an Own station within the service areas of at least two identified SSRs at known locations derives differential azimuth (A), differential time of arrival (T), identity and altitude data regarding one or more transponder-equipped Other station from standard ATCRBS interrogations and replies. These data are used to compute the positions of Own and Other stations for display at the Own station.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: August 30, 1988
    Assignee: Litchstreet Co.
    Inventors: George B. Litchford, Burton L. Hulland
  • Radiolocation with respect to an Own station, using Omega signals or the like
    Patent number: 4191958
    Abstract: Radiolocation, with respect to an Own station, of a transmitter-equipped Other station by triggering the transmitter to transmit identification messages in response to timing signals from a reference source such as an Omega transmitter, receiving the messages and the timing signals at the Own station and comparing them to obtain a line of position of the Other station.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: March 4, 1980
    Assignee: H & L Co.
    Inventors: Burton L. Hulland, George B. Litchford