Method for calibrating a wideband direction finding system
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United States of America Patent
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Mar 2, 2004
Grant Date -
Oct 2, 2003
app pub date -
Aug 30, 2001
filing date -
Aug 31, 2000
priority date (Note) -
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Abstract
The invention is a method of calibrating the sensor system of a wideband direction finder using a noise source. The sensor system includes at least two wideband tuners, and an analog/digital (A/D) converter connected to each wideband tuner. The calibration method involves selecting a common set of center frequencies for each of the wideband tuners. The wideband tuners receive a signal from the noise source on a per data frame basis. The passband of the received signal is then divided into a number of time-sampled data frames. For each time-sampled data frame, both a gain variation and a phase variation are calculated for the noise received at each wideband tuner. Gain and phase differences between the signal received by each wideband tuner within the same frame are compared. Based on the time-sampled data collected, the phase and gain differences for the signals received at the tuners which have not been previously mapped can be determined. As a result, this calibration method determines a series of calibration factors for each frame, and for a wide range of frequencies.
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