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High precision range measurement technique

  • US 6,492,937 B1
  • Filed: 11/02/2001
  • Issued: 12/10/2002
  • Est. Priority Date: 11/02/2001
  • Status: Expired due to Fees
First Claim
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1. A method of measuring distance between two platforms with high precision, comprising the steps of:

  • determining an estimate of distance D between the two platforms within a first range of error;

    transmitting an RF signal from a range-only radar located on a first platform;

    receiving the RF signal transmitted by the range-only radar on the first platform by a repeater located on a second platform;

    retransmitting the RF signal by the repeater on the second platform;

    receiving the retransmitted RF signal by the range-only radar located on the first platform;

    measuring phase difference between the RF signal transmitted by the range-only radar located on the first platform and the RF signal retransmitted by the repeater located on the second platform;

    converting the measured phase difference to a measure of distance δ

    ; and

    adding the estimate of the distance D to the measure of distance δ

    , to obtain a measure of total distance between the two platforms.

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