Direction-finding for multiple cochannel sources
First Claim
1. A method for determining the angles of arrival of multiple simultaneous radio frequency (RF) cochannel signals received at a P-element antenna array, the method comprising:
- receiving multiple simultaneous RF cochannel signals at the array;
sequentially forming mixtures of the received RF cochannel signals using RF mixture weights, thereby enabling nonsimultaneously sampled mixtures;
forming a downconverted baseband mixture for each RF mixture using single channel downconversion;
forming data cumulants based on the baseband mixtures; and
searching over appropriate degrees of freedom in a mixture manifold including a set of possible data cumulants associated with the array to establish a best fit between the formed data cumulants and the possible data cumulants, thereby determining angle of arrival (AOA) estimates for each of the received cochannel signals.
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Abstract
Techniques for determining the angles of arrival of multiple simultaneous cochannel sources using only a single RF receiver sampling and downconversion channel is disclosed. This is accomplished by sequentially forming several known mixtures of multiple antenna signals in the RF domain prior to downconversion and digitization. Angle of arrival information is then recovered through the application of higher order statistics and subspace fitting techniques. The same principles can be applied to other P-element receiver arrays (e.g., acoustical receiver array).
30 Citations
26 Claims
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1. A method for determining the angles of arrival of multiple simultaneous radio frequency (RF) cochannel signals received at a P-element antenna array, the method comprising:
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receiving multiple simultaneous RF cochannel signals at the array; sequentially forming mixtures of the received RF cochannel signals using RF mixture weights, thereby enabling nonsimultaneously sampled mixtures; forming a downconverted baseband mixture for each RF mixture using single channel downconversion; forming data cumulants based on the baseband mixtures; and searching over appropriate degrees of freedom in a mixture manifold including a set of possible data cumulants associated with the array to establish a best fit between the formed data cumulants and the possible data cumulants, thereby determining angle of arrival (AOA) estimates for each of the received cochannel signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for determining the angles of arrival of multiple simultaneous cochannel signals received at a P-element antenna array, the method comprising:
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receiving multiple simultaneous cochannel signals at the array; sequentially forming mixtures of the received cochannel signals using mixture weights, thereby enabling nonsimultaneously sampled mixtures; forming data cumulants based on the formed mixtures; and searching over appropriate degrees of freedom in a mixture manifold including a set of possible data cumulants associated with the array to establish a best fit between the formed data cumulants and the possible data cumulants, thereby determining angle of arrival (AOA) estimates for each of the received cochannel signals. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A system for determining the angles of arrival of multiple simultaneous cochannel signals received at a P-element receiver array, the system comprising:
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two or more elements adapted to receive multiple simultaneous cochannel signals; a mixture forming section adapted to sequentially form mixtures of the received cochannel signals using mixture weights, thereby enabling nonsimultaneously sampled mixtures; a form cumulants module adapted to form data cumulants based on the formed mixtures; and a subspace fitting search module adapted to search over appropriate degrees of freedom in a mixture manifold including a set of possible data cumulants associated with the array to establish a best fit between the formed data cumulants and the possible data cumulants, thereby determining angle of arrival (AOA) estimates for each of the received cochannel signals.
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Specification