In-flight antenna optimization

Details In-flight antenna optimization In-flight antenna optimization

1997-12-19

1999-07-27

Issing, Gregory C.

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

Directive

Including a steerable array

342 81, 342174, 342368, H01Q 324

Patent

active

059298103

ABSTRACT:
A method and system for phased array radar antenna calibration to be made in flight employs a synthesized initial transmission signal having a notch in the main direction of beam. This has the effect of returning reflected receiver signals that are main lobe clutter free, but contain clutter returned solely from the sidelobe radiation. The received clutter data is processed to yield a set of coefficients that, when combined with subsequent radar signal return resulting from a signal having a main lobe, provides a return signal that is free from aircraft induced distortions and misalignments that can result in sidelobe induced false alarms. All data processing is conducted in the time domain rather than the frequency domain, thus, avoiding Doppler frequency foldover problems due to ambiguities from signals received at multiple aspect angles.

REFERENCES:
patent: 3787850 (1974-01-01), Sletten et al.
patent: 3858208 (1974-12-01), Parke et al.
patent: 4488155 (1984-12-01), Wu
patent: 5229776 (1993-07-01), Kelly et al.
patent: 5283587 (1994-02-01), Hirshfield et al.
patent: 5530449 (1996-06-01), Wachs et al.

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