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Method for calibrating a wideband direction finding system

  • US 6,700,537 B2
  • Filed: 08/30/2001
  • Issued: 03/02/2004
  • Est. Priority Date: 08/31/2000
  • Status: Active Grant
First Claim
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1. A method of calibrating a sensor system of a wideband direction finder having at least two antenna elements using a noise source, the direction finder having at least two arms, each arm having a wideband tuner for receiving a noise on a per data frame basis from the noise source, with each arm coupled to the data processing means, the method including the steps of:

  • a) selecting a set of centre frequencies common for all wideband tuners in the direction finder;

    b) dividing a passband of the noise source into a number of time-sampled data frames, such that the dividing is dependent on the centre frequencies;

    c) for each time-sampled data frame received by each arm;

    c1) reading a gain and a phase of the noise at each wideband tuner for a given frequency;

    c2) processing the gain and the phase for each time-sampled data frame, to transform the gain and the phase into the frequency domain and to obtain intermediate results;

    c3) calculating a gain difference and a phase difference between the intermediate results output from each arm;

    c4) repeating steps c1) to c3) for each given frequency in a chosen group of frequencies, the chosen group of frequencies being within a frequency range of the time-sample data frame; and

    c5) averaging the gain and the phase difference obtained in step c4) for the time-sampled data frame to obtain a calibration factor having a gain component and a phase component; and

    d) adjusting the sensor system based on the calibration factor;

    wherein a passband of the noise source covers at least one portion of a desired radio frequency band.

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