The invention refers to a method for enhancing the ratio between the main lobe (5) and grating lobes (7) in an antenna array (1) comprising a number of n antenna elements (2). The method comprises the steps of; receiving analog signals on a number of m antenna array (1) elements (2); producing a radiation diagram for the array (1) from the values in the signals. The method is characterised in that a number of antenna elements (2') are switched off or reduced during different times and that the corresponding radiation diagrams for the different times are added to each other such that a sum radiation diagram is produced. The invention also refers to an antenna array system comprising means for performing the method.
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