Optical nulling of wideband microwave signals

Adaptive nulling is a technique to reduce the detection of unwanted interference by selecting specifically against some characteristic of the interference. In the case of an antenna with several subapertures or channels, spatial selection of the interference is implemented through appropriate comple...

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Bibliographic Details
Published inProceedings of LEOS '93 pp. 512 - 513
Main Authors Schulz, P.A., Rispin, L.W., LeComte, W.L., Henion, S.R., Johnson, L.M., Roussell, H.V., Lummings, W.C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1993
Subjects
Frequency
Interference
Microwave technology
Optical attenuators
Optical filters
Optical modulation
Optical sensors
Photodetectors
Signal analysis
Wideband
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Summary:Adaptive nulling is a technique to reduce the detection of unwanted interference by selecting specifically against some characteristic of the interference. In the case of an antenna with several subapertures or channels, spatial selection of the interference is implemented through appropriate complex weighting of the channels to make the net antenna sensitivity orders of magnitude smaller in the direction of the interference. This paper describes how optics has been used to achieve a wide-bandwidth (2 GHz) null centered at 6 GHz for the case of two channels. Such a 33% bandwidth null could not be achieved with microwave technology alone.< >
ISBN:0780312635
9780780312630
DOI:10.1109/LEOS.1993.379286