Adaptive azimuth processing for monopulse IFF interrogators

Details Adaptive azimuth processing for monopulse IFF interrogators Adaptive azimuth processing for monopulse IFF interrogators

1997-10-27

1999-04-06

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Determining direction

Monopulse

342 45, 342140, 342195, G01S 1344

Patent

active

058924787

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.

REFERENCES:
patent: 4128839 (1978-12-01), McComas
patent: 5128682 (1992-07-01), Kruger
patent: 5450089 (1995-09-01), Hui et al.

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