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Correlation function measuring method and apparatus

  • US 6,594,605 B2
  • Filed: 01/29/2001
  • Issued: 07/15/2003
  • Est. Priority Date: 02/03/2000
  • Status: Expired due to Fees
First Claim
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1. A correlation function measuring method in which a first monitored signal is processed by a first signal processing means to give a first spectrum, a second monitored signal is processed by a second signal processing means to give a second spectrum, and a correlation function between the first spectrum and the second spectrum is measured, the method comprising the steps of:

  • inputting, before measuring the correlation function, correction signals to the first signal processing means and the second signal processing means, and obtaining correction values corresponding to frequencies of the correction signals, based on spectrums from the first and second signal processing means; and

    in measuring the correlation function, producing a correlation function between the first spectrum and the second spectrum by using the correction values corresponding to the frequencies;

    wherein when obtaining the correction values, first correction signals are supplied to the first and second signal processing means and their frequencies swept to produce magnitude correction data corresponding to the frequencies based on spectrums from the first and second signal processing means, and second correction signals are supplied to the first and second signal processing means to produce phase correction data corresponding to the respective frequencies based on spectrums from the first and second signal processing means, and the correction values corresponding to the respective frequencies are obtained based on the magnitude correction data and the phase correction data;

    wherein the first correction signals are continuous waves while the second correction signals are modulated waves.

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