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Passive range and angle measurement system and method

  • US 6,806,828 B1
  • Filed: 09/22/2003
  • Issued: 10/19/2004
  • Est. Priority Date: 09/22/2003
  • Status: Expired due to Fees
First Claim
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1. A method of determining range from a moving platform to an emitter comprising the steps of:

  • (a) receiving a RF signal from the emitter;

    (b) counting a number of phase reversals of the received RF signal during a period of time;

    (c) measuring a Doppler frequency during the period of time; and

    (d) determining the range to the emitter based on both the number of phase reversals counted in step (b) and the Doppler frequency measured in step (c).

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