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Passive tracking system and method

  • US 6,618,010 B2
  • Filed: 11/14/2001
  • Issued: 09/09/2003
  • Est. Priority Date: 11/14/2001
  • Status: Expired due to Fees
First Claim
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1. A passive system for locating a transmitter, said transmitter having a transmitter frequency, said transmitter producing a transmitter signal, said system comprising:

  • at least one antenna array having a first antenna element, a second antenna element and a third antenna element, said first antenna element being operable for receiving a first received signal from said transmitter, said second antenna element being operable for receiving a second received signal from said transmitter, and said third antenna being operable for receiving a third signal from said transmitter; and

    electronic circuitry for said antenna array to determine a first phase difference Φ

    1 and a second phase difference Φ

    2 between said first received signal, said second received signal, and said third received signal, said electronic circuitry being operable for utilizing said first phase difference and said second phase difference for determining location information using the equations φ

    =arctan

    (Φ

    2
    Φ

    1
    )
    embedded imageand θ

    =arcsin(Φ

    12
    +Φ

    22
    π

    )
    embedded imagewhich are related to a vector (sin θ

    cos Φ

    , sin θ

    sin Φ

    , cos θ

    ) oriented in a direction of said transmitter with respect to said at least one antenna array.

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