Steerable antenna interferer rejection techniques
AssigneeNorthrop Grumman Corporation
InventorMichael H. Myers
Life of this patent
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Abstract
A steerable antenna array (10) includes a plurality of antenna elements (12a-12f) which receive broad band signals and narrow band interfering signals which together form antenna signals. The antenna signals are combined with weighting signals by combining functions (16a-16f) to form a combined signal, which is filtered by a filter function (30) to filter the narrow band signals. The filtered signals are sent to a weight processor (50) which also receives the antenna signals as an input. The processor (50) generates the weighting signals so that interference from the narrow band signals is reduced.
Claims19
In a steerable antenna comprising a plurality of antenna elements receiving a first type signal and an interfering second type signal different from the first type signal, the antenna elements generating corresponding antenna signals, the antenna signals being combined with weighting signals to form at least one combined signal, apparatus for nulling the interfering second type signals comprising:
- a filter arranged to filter the second type signal from the combined signal to generate a filtered signal, wherein the filter reduces said frequencies exceeding the average spectral density of the first type signal to an amplitude less than the average amplitude of the first type signals to generate the filtered signal;
- and
- a weight processor responsive to the filtered signal and the antenna signals to generate said weighting signals, whereby interference from the second type signal is reduced.
In a steerable antenna comprising a plurality of antenna elements receiving a first type signal and an interfering second type signal different from the first type signal, the antenna elements generating corresponding antenna signals, the antenna signals being combined with weighting signals to form at least one combined signal, a method of nulling the interfering second type signals comprising:
- filtering the second type signal from the combined signal to generate a filtered signal, wherein said filtering comprises converting said combined signal to a frequency domain, filtering the second type signal from the combined signal in the frequency domain to generate a corrected signal and converting the corrected signal to a time domain to generate the filtered signal;
- and
- generating said weighting signals in response to the filtered signal and the antenna signals, whereby interference from the second type signal is reduced.
Dependencies are inferred from the claim text.