Loading patent…
AssigneeThe Johns Hopkins University
InventorJames H Higbie
Estimating the term…
A system is provided which combines the advantages of Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection, as well as Adaptive Filtering, signal processing techniques and achieves the capabilities of all these techniques. The present invention represents the first successful integrated system for performing signal processing techniques associated with an Adaptive Antenna Array (AAA) system and an Adaptive Locally-Optimum Detection (ALOD) system. The system automatically distributes interference signals among Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection sub-systems according to which sub-system's algorithms can provide a more optimum suppression of the interference signals. The system permits an adaptive antenna array with a given number of antenna elements to effectively suppress a larger number of interferers than it otherwise could, and to adapt more quickly to a rapidly changing interference scenario. For an adaptive antenna array with a small number of antenna elements, e.g., two to four, the system provides added interference suppression capability than could be done by adding antenna elements to the adaptive antenna array. The system is primarily designed for incorporation within systems using Direct Sequence Spread Spectrum signals, such as Global Positioning System (GPS) signals. In a preferred embodiment the inventive system is incorporated within a conventional GPS receiver which tends to be vulnerable to jamming by interference signals.
A combined Adaptive Filtering, Adaptive Antenna Array and Adaptive Locally-Optimum Detection (AF-AAA-ALOD) system comprising:
A combined Adaptive Filtering, Adaptive Antenna Array and Adaptive Locally-Optimum Detection (AF-AAA-ALOD) system comprising:
A method for processing a plurality of input signals received by a plurality of antenna elements, the method comprising the steps of:
A combined Adaptive Antenna Array-Adaptive Locally-Optimum Detection (AAA-ALOD) system comprising:
A method for processing a plurality of input signals received by a plurality of antenna elements, the method comprising the steps of:
A combined Adaptive Antenna Array-Adaptive Locally-Optimum Detection (AAA-ALOD) system comprising:
A computer-readable medium comprising instructions which when executed on at least one processor, cause the at least one processor to perform a method for processing a plurality of input signals received by a plurality of antenna elements, the method comprising the steps of:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Drawings are temporarily unavailable. Open the PDF at USPTO
With countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or…:…
Means for null steering; Adaptive interference nulling: combination of a main antenna unit with an auxiliary antenna unit
Combination of a main antenna unit with an auxiliary antenna unit: the auxiliary unit being composed of a plurality of antennas
Weighted combining: joint weighting
Term end not estimated
1. Field of the Invention
The present invention relates to signal acquisition and processing. In particular, the present invention relates to a system that combines Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection signal processing techniques and achieves the capabilities of both techniques. The system automatically distributes interference signals among Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection sub-systems according to which sub-system's algorithms can provide a more optimum suppression of the interference signals. The present invention also relates to a system that combines Adaptive Filtering and Adaptive Locally-Optimum Detection signal processing techniques and achieves the capabilities of both techniques. The present invention also relates to a system that combines Adaptive Filtering, Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection signal processing techniques and achieves the capabilities of all three techniques. The system is primarily designed for incorporation within systems using Direct Sequence Spread Spectrum signals, such as Global Positioning System (GPS) signals. In a preferred embodiment the inventive system is incorporated within a conventional GPS receiver, which tends to be vulnerable to jamming by interference signals.
2. Description of the Related Art
FIG. 1 is a signal/data flow diagram illustrating the architecture of a prior art Adaptive Antenna Array (AAA) system;
FIG. 2 is a signal/data flow diagram illustrating the architecture of a prior art Adaptive Antenna Array (AAA) system with beamforming;
FIG. 3 is a signal/data flow diagram illustrating the architecture of a prior art Adaptive Filter-Adaptive Antenna Array (AF-AAA) system;
The present invention provides a system that combines the advantages of Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection, as well as Adaptive Filtering, signal processing techniques and achieves the capabilities of all these techniques. The present invention represents the first successful integrated system for performing signal processing techniques associated with an Adaptive Antenna Array (AAA) system and an Adaptive Locally-Optimum Detection (ALOD) system. The system automatically distributes interference signals among Adaptive Antenna Arraying and Adaptive Locally-Optimum Detection sub-systems according to which sub-system's algorithms can provide a more optimum suppression of the interference signals. For applications with a single antenna element, the present invention also provides an improved system for combining the advantages of an Adaptive Filter (AF) system and an ALOD system and achieving the capabilities of both these techniques.
The inventive system permits an adaptive antenna array with a given number of antenna elements to effectively suppress a larger number of interferers than it otherwise could, and to adapt more quickly to a rapidly changing interference scenario. For an adaptive antenna array with a small number of antenna elements, e.g., two to four, the inventive system provides a significant increase in interference suppression capability.
The system is primarily designed for incorporation within systems using Direct Sequence Spread Spectrum signals, such as Global Positioning System (GPS) signals. In a preferred embodiment the inventive system is incorporated within a conventional GPS receiver, which tends to be vulnerable to jamming by interference signals. The system is also appropriate for incorporation within systems using hybrid Direct Sequence and Frequency-Hopped Spread Spectrum signals, such as military AJ radio signals.