Method and Apparatus for Performing Bistatic Radar Functions
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Abstract
A bistatic radar system having a transmitter that generates unique signals at spatially independent transmitter degrees of freedom and a receiver that filters the signal at each receiver degree of freedom into a group of signals identical in number to the number of transmitter degrees of freedom. The receiver formats the filtered signals into a 2-dimensional array of elements. The receiver rotates the array so that the new axes are aligned with the Doppler gradient. The data is then re-sampled and projected to linearize the clutter signal. The receiver may be integrated with a broad class of adaptive and non-adaptive clutter mitigation approaches such as electronic clutter tuning and projected bistatic space-time adaptive processing, or STAP.
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Citations
22 Claims
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1-19. -19. (canceled)
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20. A method of filtering and processing a received radar signal comprising the steps of:
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receiving an element-level radar signal;
splitting said element-level radar signal into a plurality of signal components, each said signal component comprising energy scattered by a specific transmit element—
receiver—
element pair;
forming a 2-D array of data associated with a plurality of transmitter and receiver degrees of freedom;
rotating said 2-D array of data;
re-sampling said array of data to find new degrees of freedom; and
using a projection to eliminate residual degrees of freedom.
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21. A method of filtering and processing a received radar signal comprising the steps of:
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receiving an element-level radar signal;
splitting said element-level signal into a plurality of signal components, each said signal component comprising energy scattered by a specific transmitter element-receiver element pair;
generating a Complex Ambiguity Function by filtering said plurality of signal components, each filtered signal component comprising energy delayed by a specific value and Doppler shifted by a specific value relative to the direct path signal;
generating a plurality of 4-dimensional labels for components of signal energy; and
performing Reduced Rank STAP processing on said filtered signal components.
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22. A method of filtering and processing a received radar signal comprising the steps of
receiving an element level radar signal; -
generating a Complex Ambiguity Function by filtering said element-level radar signal into a first plurality of signal components, each of said first plurality of signal components comprising energy delayed by a specific value and Doppler shifted by a specific value relative to the direct path signal;
filtering said Complex Ambiguity Function into a second plurality of signal components, each of said second plurality of signal components comprising energy scattered by a specific transmit element and received by a specific receiver element;
generating a plurality of 4-dimensional labels for components of signal energy; and
performing Reduced Rank STAP processing.
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Specification