Patents by Inventor James C. Rennie

James C. Rennie 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: 4198631
    Abstract: The apparatus generates a train of pulse signals in real time which are fed to a Plan Position Indicator radar display video bright-up circuit. A line is formed on the display at a bearing .theta..sub.R , the direction of a VHF/DF fix, and passes through a point having the coordinates R.sub.o, .angle..theta..sub.o .degree., the position of the VHF/DF receiver, with respect to the center of the plan position indicator rotating radial scan. The radial scan operates at a radar trigger pulse repetition frequency F and rotates at a frequency f to subtend an angle .DELTA..theta.=360.degree..times.f/F per scan. The apparatus includes an up-counter for storing a count of R.sub.o sin (.theta..sub.R -.theta..sub.o), and a down-counter coupled to the up-counter and enabled at the pulse repetition frequency F to receive the count from the up-counter. The down-counter is adapted to provide an output pulse signal to the video bright-up circuit when its count reaches 0.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: April 15, 1980
    Assignee: Canadian Patents & Development Limited
    Inventors: James C. Rennie, Philip M. Thompson, Vernon I. Davies