Patents by Inventor Jan A. Dijkstra

Jan A. Dijkstra 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).

  • Radar apparatus with jamming indicator and receiver device with jamming indicator
    Patent number: 5173701
    Abstract: A radar apparatus is provided with a jamming indicator (11), the jamming indicator (11) having the same bandwidth as the preselector filter (15) of the radar receiver (5).
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: December 22, 1992
    Assignee: Hollandse Signaalapparaten B.V.
    Inventor: Jan A. Dijkstra
  • Pulse radar apparatus and pulse discrimination circuit suitable for incorporation in a pulse radar apparatus
    Patent number: 5047780
    Abstract: A pulse radar apparatus is provided with a transmitting unit (4) for the transmission of a modulated transmitter pulse Y.sub.t, a mixer (9), an IF amplifier (11) and a quadrature detector (12) for the reception of signals Y.sub.r and the correlation of signals Y.sub.r with a replica X of the emitted modulated transmitter pulse Y.sub.t, to obtain an in time compressed correlation signal .sigma..sub.xy (.delta.). The pulse radar apparatus is also provided with a pulse discriminator (3) to enable, on the basis of at least one amplitude .vertline.Y.sub.r .vertline. of the received signal Y.sub.r and at least one amplitude .vertline..sigma..sub.xy (.delta.).vertline. of the correlation signal .sigma..sub.xy (.delta.), differentiation between the signals Y.sub.r, possessing modulation, and interference.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: September 10, 1991
    Assignee: Hollandse Signaalapparaten B.V.
    Inventor: Jan A. Dijkstra