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Method for harmonic number determination in a microwave frequency counter

  • US 5,008,610 A
  • Filed: 07/31/1989
  • Issued: 04/16/1991
  • Est. Priority Date: 07/31/1989
  • Status: Expired due to Fees
First Claim
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1. In a harmonic heterodyne converter wherein the frequency of an input signal is determined from a local oscillator frequency, an intermediate frequency obtained by mixing the local oscillator frequency with the input signal, and a harmonic number, a method for determining a generalized harmonic number H, comprising the steps of:

  • computing an estimated generalized harmonic number H1est from closely-spaced first and second local oscillator frequencies f01 and f02 and first and second intermediate frequencies fi1 and fi2 obtained by successively mixing said first and second local oscillator frequencies with the input signal;

    selecting a third local oscillator frequency f03 such that the corresponding generalized harmonic number H3 differs from the estimated harmonic number by a predetermined integer, k;

    measuring a third intermediate frequency fi3 obtained by mixing the third local oscillator frequency with the input signal; and

    computing a corrected generalized harmonic number H1crc from the first and third local oscillator frequencies and the first and third intermediate frequencies.

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