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All weather tactical strike system (AWTSS) and method of operation

  • US 5,225,839 A
  • Filed: 12/29/1980
  • Issued: 07/06/1993
  • Est. Priority Date: 12/29/1980
  • Status: Expired due to Fees
First Claim
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1. Apparatus making up a receiving arrangement whereby the directions of targets illuminated by a radar beam are determined by a monopulse technique, such apparatus comprising:

  • (a) a phased array antenna having at least a four element diamond feed for transmitting and receiving pulses of energy in a radar beam;

    (b) a first, second, third and fourth receiver channel, each one thereof being connected to a different one of the four elements in the four element diamond feed, for producing first, second, third and fourth baseband signals corresponding to each signal received from illuminated targets;

    (c) means for periodically applying a reference signal at the frequency of the next-to-be transmitted pulse to each one of the receiver channels during dead times to produce baseband reference signals indicative of the relative phase shifts of signals passing therethrough; and

    (d) signal processing means, responsive first to the baseband reference signals out of the first, second, third and fourth receiver channels to produce error signals indicative of the phase shift induced in each of such receiver channels and then to the error signals and to the baseband signals out of the first, second, third and fourth receiver channels, to form monopulse sum and difference signals corresponding to the direction of each illuminated target.

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