Adaptive azimuth processing for monopulse IFF interrogators
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Oct 27, 1997
filing date -
Oct 27, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When an IFF system interrogates a target aircraft and receives IFF reply signals, monopulse processing of the reply signals can provide more accurate determination of target azimuth. However, when reply signals have amplitudes close to noise or jamming levels, azimuth processing by non-monopulse techniques such as beamsplitting or center of gravity analysis can provide better accuracy than monopulse azimuth processing. Methods are described to enable adaptive selection of the type of azimuth processing to be employed. Such selection is based on active comparison of received signal magnitudes against monopulse sum and difference signal threshold values and a noise threshold value. Monopulse azimuth processing can thus be used at all times, except when non-monopulse azimuth processing is chosen by such adaptive selection.
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