Algorithm of Interferometer in Direction Finding Based on Virtual Array Transformation
Zishu He · Modern Radar · 2012
A novel interferometer direction finding algorithm based on the virtual array transformation is proposed to solve the ambiguity problem in wide bandwidth direction finding.In this approach,new phase differences are computed through vector operations on the original phase differences measured in the actual array;these new phase differences are then considered as the phase differences obtained across adjacent elements of a virtual array from which the unambiguous incoming direction is calculated.The radius of virtual array obtained though virtual array transformation is greatly reduced and therefore the highest unambiguous frequency of the system is elevated to a larger extent.A new effective way of solving ambiguity can thus be derived.The results of computer simulation demonstrate the correctness of the virtual array transformation and the validity of the interferometer direction finding algorithm based on the virtual array transformation.