| CPC H04W 64/006 (2013.01) | 19 Claims |
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1. A direction finding method of determining bearings of radio signals by a direction finding system, the direction finding system comprising at least two antennas, at least two receivers being coupled with one of the at least two antennas, respectively, at least two analog-to-digital converters (ADCs), a pre-processing circuit, and an analysis circuit, the direction finding method comprising the steps of:
receiving, by the at least two receivers, electromagnetic waves via the at least two antennas, thereby obtaining at least two input signals;
digitizing, by the at least two ADCs, the at least two input signals, thereby obtaining at least two digitized input signals;
generating, by the pre-processing circuit, input signal data based on the at least two digitized input signals;
determining, by the analysis circuit, whether the received electromagnetic waves comprise at least one useful signal based on the input signal data;
determining, by the analysis circuit, a bearing of a first useful signal based on the input signal data;
removing, by the analysis circuit, data corresponding to the first useful signal from the input signal data, thereby obtaining modified input signal data, wherein the modified input signal data corresponds to the received electromagnetic waves with the first useful signal removed;
determining, by the analysis circuit, whether the modified input signal data comprises at least one further useful signal;
determining, by the analysis circuit, a bearing of a second useful signal based on the modified input signal data; and
removing, by the analysis circuit, data corresponding to the second useful signal from the modified input signal data.
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