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Loro antenna and pulse pattern detection system

  • US 5,247,311 A
  • Filed: 06/10/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 06/10/1992
  • Status: Expired due to Fees
First Claim
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1. A method for determining the relative position of an observer object from at least one set of target object transponder replies by measuring bearing and range from said observer object in an environment having at least one rotating pulsed synchronous or non synchronous interrogation signal source, said method comprising:

  • (a) receiving said interrogation signal source and said target object reply signals with a multi element antenna,(b) varying the attenuation of each of said multi element antenna received signal paths with time to result in a rotating shaped antenna pattern in space,(c) controlling said shaped antenna pattern rotation rate to be at least one revolution during each said interrogation signal source beam passage over said target object,(d) generating an antenna rotation reference signal each time said shaped antenna pattern maximum received signal position passes a specified reference direction angle,(e) summing said multi element antenna signal paths onto a single microwave receiver channel,(f) determining a base pulse repetition pattern on at least one set of said interrogation signal source signals by a pulse deinterleaving process,(g) determining a target pulse repetition pattern by a pulse deinterleaving process on at least one said target object transponder reply,(h) determining a matched pulse pattern for at least one said target pulse repetition pattern that correlates with said base pulse repetition pattern of said interrogation signal source,(i) determining at least one target object relative bearing angle BT by measuring the phase of the amplitude modulation envelope on said matched pulse pattern with respect to said antenna rotation reference signal,(j) determining at least one interrogation signal source relative bearing angle BR by measuring the phase of the amplitude modulation envelope on said base pulse repetition pattern with respect to said antenna rotation reference signal,(k) determining at least one interrogation signal source object range r by use of signal strength versus range transformation calculations for said base pulse repetition pattern signal pulse amplitudes,(l) determining the speed of rotation of said interrogation signal source antenna by measuring the time interval between successive sweeps past said observer object,(m) determining an inscribed angle BS from said speed of rotation by measuring a time between said target pulse repetition replies and said interrogation signal source antenna illumination of said observer object,(n) calculating at least one target object range t by using said representations BT, BR, r and BS,(o) calculating the relative position of the observer object from at least one said target object using said representations BT and t.

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