Title: Radio direction finder with means for reducing sensitivity to multipath propogation errors

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Abstract: A surface based direction finder for determining the direction of radiations from a remote station (aircraft for example), using a plural element linear or circular receiving antenna array. The arriving energy phases are measured in at least one element group with two element pairs, (for example) the elements of each pair being equally spaced and aligned so that a line joining elements of even ordinal number is parallel to the line joining the elements with odd ordinal numbers. The amplitudes (m1, m2, m3 and m4) and the phases (.alpha.1, .alpha.2) of the rf signal picked up by each element are measured separately and the phase .beta. of the desired wave is determined by computer solution of the typical equation derived from the law of consines; m1.sup.2 + m2.sup.2 -2m1 m2 cos (.alpha.1 - .beta.)= m3.sup.2 + m4.sup.2 - 2m3m4 cos (.alpha.2- .beta.). Other configurations employing three elements in line and elements in a circle are also described and the corresponding cosine law equations given.


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