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Exploitation of emitter RF agility for unambiguous interferometer direction finding

  • US 5,652,590 A
  • Filed: 04/10/1996
  • Issued: 07/29/1997
  • Est. Priority Date: 04/10/1996
  • Status: Expired due to Fees
First Claim
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1. A direction finding method for unambiguously estimating an angle of arrival of an RF agile signal derived from an RF agile emitter, said method comprising the steps of:

  • providing a long baseline interferometer for receiving RF agile radio frequency signals from the emitter;

    processing RF agile signals received from the emitter to determine the phase of the received signals;

    processing the phase signals to estimate the direction of arrival of the RF agile signals, which provides an ambiguous direction to the emitter;

    estimating the angle of arrival of the received RF agile signal from the emitter by determining the rate at which the phase of the received RF agile signal changes with respect to frequency to provide an independent estimate of angle to the emitter; and

    selecting the direction of arrival of the energy from the RF agile emitter as the angle derived from processing the phase rate information, or the angle determined by processing the phase rate information as resolved by the angle produced by processing the phase rate information.

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