Adaptive elevational scan processor statement of government interest
First Claim
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1. In a system for processing signals that employs a single receive channel, a method for space-time adaptive processing of said signals comprising the steps of:
- receiving a plurality of signals from an area potentially containing at least one target;
moving said single receive channel to combine said plurality of signals into a plurality of groups, each of said groups representing a distinct processing segment from a single coherent processing interval, each of said distinct processing segments corresponding to multiple spatial orientations;
correlating an interference component of said signals over a plurality of said distinct processing segments, whereby said step of correlating yields correlated interference for each of said distinct processing segments; and
canceling said correlated interference by adaptively combining said plurality of signals by means of an adaptive filter, whereby interference obscuring said at least one target is reduced.
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Abstract
A signal processing system applies space-time adaptive processing ("STAP") to an airborne surveillance Doppler radar comprised of a single-channel, electronically scanned antenna. The STAP substantially improves signal-to-interference-plus-noise ratio ("SINR") by synthetically creating angular degrees of freedom, thereby improving the detection of weak targets.
26 Citations
20 Claims
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1. In a system for processing signals that employs a single receive channel, a method for space-time adaptive processing of said signals comprising the steps of:
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receiving a plurality of signals from an area potentially containing at least one target; moving said single receive channel to combine said plurality of signals into a plurality of groups, each of said groups representing a distinct processing segment from a single coherent processing interval, each of said distinct processing segments corresponding to multiple spatial orientations; correlating an interference component of said signals over a plurality of said distinct processing segments, whereby said step of correlating yields correlated interference for each of said distinct processing segments; and canceling said correlated interference by adaptively combining said plurality of signals by means of an adaptive filter, whereby interference obscuring said at least one target is reduced. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for space-time adaptive processing of signals from which to identify one of presence and absence of at least one potential target, said apparatus including a single receive channel, which comprises:
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means for receiving a plurality of signals from an area potentially containing at least one target; means for moving said single receive channel to combine said plurality of signals into a plurality of groups, each of said groups representing a distinct processing segment from a single coherent processing interval, each of said distinct processing segments corresponding to multiple spatial orientations; means for correlating an interference component of said signals over a plurality of said distinct processing segments, thereby yielding correlated interference for each of said distinct processing segments; and means for canceling said correlated interference, said means including an adaptive filter for adaptively combining said plurality of signals, whereby interference obscuring said at least one potential target is reduced. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for space-time adaptive processing of signals from which to identify one of presence and absence of at least one potential target, which comprises:
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a device having a single channel for receiving said signals; said device being adapted for scanning continuously through a series of positions; said device occupying said series of positions consecutively to receive, when in each of said series of positions, each of a sequence of said signals; means for segmenting said sequence into at least two groups; means for transforming each of said at least two groups; and a signal combiner adapted for weighting and summing said transformed groups to cancel interference components thereof, whereby said at least one potential target is unmasked. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification