Patent ID: 7477192
Filing Date: 2009-01-13
Classification: G01S

Abstract:
1. A direction finding system for determining the direction of arrival at a particular location of signals received by a plurality of antennas that are arrayed in a known pattern in relation to the particular location, the system comprising: means for coding signals provided by at least some of the plurality of arrayed antennas in response to receipt of the signals within a predetermined band of frequencies; means for combining coded signals from different sets of less than all of the plurality of arrayed antennas to provide an analog combined signal; means for down-converting the frequency band of the analog combined signal; means for converting the down-converted analog combined signal to a digital signal representative of the combined coded signals; means for processing the digital signal to derive signals from the plurality of signals respectively provided by the different sets of less than all of the plurality of arrayed antennas; signal processing means for processing the derived signals to determine the directions of arrival of the signals that are received by each set of antennas; and means for selecting the different sets of antennas from which the received signals are provided for said coding and combination; wherein the signal processing means include: