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Method and apparatus for operating a surface detection surveillance radar using frequency agile pulse transmissions

  • US 5,659,319 A
  • Filed: 12/21/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 12/21/1995
  • Status: Expired due to Term
First Claim
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1. A surveillance radar for propagating electromagnetic pulse energy along a propagation path sweeping in range and azimuth across a region in space including a surveillance area, and processing return energy therefrom, comprising:

  • transmitting means for generating a sequence of at least two pulses of carrier signals, the frequency of the carrier signal of each of said pulses in said sequence being controllable so as to be of a different frequency;

    a rotating, frequency squinting, slotted array antenna, responsive to said pulses of carrier signals for transmitting said pulses of carrier signals so as to successively illuminate specific antenna beam positions with electromagnetic energy pulses during rotation of the antenna, and receiving return signals in response to energy reflected from said beam positions by each of said successively transmitted pulses of carrier signals;

    receive means for receiving each of said return signals and developing video signals representative thereof;

    processing means for processing each of said video signals, said processing means being responsive to the frequency (FR) of each transmitted pulse of carrier signals for determining a frequency dependent squint angle for the transmitted pulse of carrier signals and the mechanical pointing angle (Mech. AZ) of the antenna at the time of transmission of each pulse of carrier signals, for determining the actual beam pointing angle (True AZ) for each of the successively received video signals, and then integrating groups of said video signals together which have physically adjacent actual beam pointing angles; and

    display means for displaying said video signals so as to enable a user to detect targets in said surveillance area.

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