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Unwrapping of phase values at array antenna elements

  • US 7,936,302 B2
  • Filed: 10/05/2006
  • Issued: 05/03/2011
  • Est. Priority Date: 10/06/2005
  • Status: Expired due to Fees
First Claim
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1. A method of processing a signal received by a phased array antenna, said method comprising:

  • (i) receiving the signal via a plurality of antenna elements of said phased array antenna, said antenna elements being situated at a set of n loci;

    (ii) measuring the phase of the signal at each locus to produce a set of n sequential phase values;

    (iii) calculating the differences between neighboring phase values in the sequence according to;


    DIFF1k

    measuredk+1

    Φ

    measuredk (k=1 to n−

    1)where Φ

    measuredk is the kth phase value in the sequence;

    (iv) calculating the differences between neighboring values of DIFF1k according to;


    DIFF2k=DIFF1k+1

    DIFF1k (k=1 to n−

    2)(v) rounding the values of DIFF2k to the nearest integral multiple of complete phase cycles to produce the set of rounded values DIFFk;

    (vi) summing neighboring values in the set of rounded values DIFFk to provide a set of values, dΦ

    k, according to;




    k+1=dΦ

    k+Diffk


    1=0 (k=1 to n−

    2)(vii) summing neighboring values of dΦ

    k to give the set of values Φ

    k according to;


    Φ

    k+1

    k+dΦ

    k
    Φ

    0=0 (k=1 to n−

    1)and(viii) adding the values Φ

    k to the corresponding values Φ

    measuredk to produce unwrapped phase values.

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