Adaptive Uniform Circular Array Beamforming under Coherent Environment
Date Issued
2007
Date
2007
Author(s)
Shan, Chia-Hsin
DOI
zh-TW
Abstract
Gernerally, if there is no correlation or incoherent between the desired signal and the interference, adaptive antenna array can receive desire signals and suppress the interference. But there will be signal cancellation in the presence of coherent interference. The reason is that the output power minimination process not only suppresses the interference but also uses the coherent interference to cancel desire signals. Coherent interference usually occur in involving mutipath propagation or smart jammer.
Many approaches, such as Spatial Smoothing, Weight Spatial Smoothing, ITAM, are proposed for solving the signal cancellation due to coherent interference, but these methods can only be applied to Uniform Linear Array. However, the direction vectors of Uniform Circular Array don’t have the vandermonde structure. The above methods can not be applied to Uniform Circular Array (UCA). In this thesis, exploiting the estimates of coherent interference incident directions, coherent interference are eliminated from the transformation of received array data , to suppress incoherent interference, the output power is minimized by the transformation of received data subject to unit gain of the desired signal. Two methods, namely DMV and SMV, are extended to the structure of the wideband UCA and are accomplished to the structure of the generalized sidelobe canceller (GSC). Finally, we compare the performance between LCMV and GSC.
Subjects
圓形天線陣列 同調
Uniform Circular Array coherent
Type
thesis
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