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    • 43. 发明授权
    • Radio-wave arrival-direction estimating apparatus and directional variable transceiver
    • 无线电波到达方向估计装置和方向可变收发器
    • US06897807B2
    • 2005-05-24
    • US10817978
    • 2004-04-05
    • Takaaki KishigamiTakashi FukagawaYasuaki YudaMasayuki Hoshino
    • Takaaki KishigamiTakashi FukagawaYasuaki YudaMasayuki Hoshino
    • G01S3/74G06K9/00G01S5/02
    • G06K9/0057G01S3/74
    • A radio-wave arrival-direction apparatus calculates a correlation matrix of received signals by correlation calculation between antenna elements, and calculates a noise spatial eigenmatrix, of which each row or column is an eigenvector belonging to a noise eigen-space, by eigenvalue factorization of the correlation matrix. The apparatus also factorizes a matrix including a product of the noise spatial eigenmatrix and a conjugated and transposed matrix of it to an upper or lower triangular matrix, using cholesky factorization. The apparatus calculates an angle evaluation value in a predetermined angle range of an arrival-angle evaluation function using the derived upper or lower triangular matrix, and determines an arrival angle based on the calculation result. A calculation amount in a variable angle range can be thus reduced without causing accuracy degradation of arrival direction, in an algorism requiring all angle sweep for arrival angle estimation of MUSIC method or the like.
    • 无线电波到达方向装置通过天线元件之间的相关计算来计算接收信号的相关矩阵,并且通过特征值因子分解来计算其每行或列是属于噪声特征空间的特征向量的噪声空间本征矩阵 相关矩阵。 该装置还使用cholesky因式分解将包括噪声空间本征矩阵的乘积和其共轭和转置矩阵的矩阵分解为上或下三角矩阵。 该装置使用导出的上下三角矩阵来计算到达角度评估函数的预定角度范围内的角度评估值,并且基于计算结果确定到达角度。 在可能的角度范围内的计算量可以在不需要对MUSIC方法等的到达角度估计进行所有角度扫描的算法中而不会导致到达方向的精度降低而降低。