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Coherent detection architecture for remote calibration of coherent systems using direct sequence spread spectrum transmission of reference and calibration signals

  • US 5,809,063 A
  • Filed: 10/25/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 10/25/1996
  • Status: Expired due to Fees
First Claim
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1. A transmission/receiving architecture for remote calibration of coherent systems using direct sequence spread spectrum transmission of reference and calibration signals comprising:

  • first and second binary antipodal waveform generators for synchronously generating first and second orthogonal signals P1 (t) and P2 (t), respectively;

    up converting means for generating first and second up converted signals;

    first transmitting means for applying amplitude and phase values to said first up converted signal and transmitting a calibration signal S1 (t);

    second transmitting means for receiving the second up converted signal and transmitting a reference signal S2 (t);

    a receiving antenna for receiving coherent calibration and reference signals from said first and second transmitting means;

    down converting means for generating the in-phase and quadrature components of the received coherent calibration and reference signals;

    third and fourth binary antipodal waveform generators for generating orthogonal delayed replica signals P1 (t-τ

    ) and P2 (t-τ

    ), respectively;

    processing means for generating estimates of the amplitudes and phases of said reference and calibration signals in the form of first and second values B1 and B2, respectively; and

    an estimator for receiving said first and second values B1 and B2 and producing amplitude and phase estimates of the received calibration signal for calibration decoding.

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