Method and wideband antenna system to minimise the influence of interference sources
AssigneeSaab AB
InventorKent Falk
Life of this patent
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Abstract
A method to minimize influence of interference sources by control of a signal to noise/interference ratio of a wideband antenna system connected to an electronic system. The wideband antenna system includes at least one array of at least two antenna elements/sub arrays. The signal to noise/interference ratio control includes establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources. The wideband antenna system is operational over a system bandwidth and operates with an instantaneous bandwidth. Estimation of interference source parameters is performed in an evaluation process. A wideband antenna system implementing the method.
Claims19
A method to minimise an influence of interference sources by control of a Signal to Noise/interference Ratio of a wideband antenna system connected to an electronic system and comprising at least one array of at least two antenna elements/sub arrays, the signal to noise interference ratio control comprising
- establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources, the signal to noise interference ratio control being achieved by affecting waveforms between the antenna elements and the electronic system with phase shifts or time delays obtained from an optimisation process for maximising the array processing gain of said array, wherein the wideband antenna system is operational over a system bandwidth and operating with an instantaneous bandwidth, and wherein the cancellation directions in the direction of the interference sources over the instantaneous bandwidth B, are accomplished by:
- a transforming module inserted between at least all but one of the antenna elements and the sub arrays in the wideband antenna system and the electronic system, a sub array comprising at least two sub elements, or the transforming module being integrated in the antenna element/sub array or the electronic system,
- parameters, being optimised by using the optimisation process over the instantaneous bandwidth for maximizing the array processing gain of said array, and
- the transforming module affecting the waveforms between at least all but one of the antenna elements and the sub arrays and the electronic system by use of the parameters obtained from the optimisation process over the instantaneous bandwidth.
A wideband antenna system arranged to minimise an influence of interference sources by an arrangement to control the Signal to Noise/interference Ratio of the wideband antenna system connected to an electronic system and comprising at least one array of at least two antenna elements/sub arrays, the signal to noise/interference control comprises means for establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources, the signal to noise/interference control being arranged to be achieved by affecting waveforms between the antenna elements and the electronic system with phase shifts or time delays obtained from an optimisation process for maximising the array processing gain of said array, wherein the wideband antenna system being arranged to be operational over a system bandwidth and arranged to operate with an instantaneous bandwidth and wherein the cancellation directions in the direction of the interference sources over the instantaneous bandwidth B, are arranged to be accomplished by:
- a transforming module arranged to be inserted between at least all but one of the antenna elements and the sub arrays in the wideband antenna system and the electronic system, a sub array comprising at least two sub elements, or the transforming module being integrated in the antenna element/sub array or the electronic system,
- parameters, being arranged to be optimised by using the optimisation process over the instantaneous bandwidth for maximizing the array processing gain of said array, and
- the transforming module being arranged to affect the waveforms between at least all but one of the antenna elements and the sub arrays and the electronic system by use of the parameters obtained from the optimisation process over the instantaneous bandwidth.
Dependencies are inferred from the claim text.