CAJ | 학술논문

提出一种基于信号子空间转换法（signal subspace transform，SST）与快速子空间测向算法（fast subspace estimation of DOA ，FDOA）的局放超声阵列信号高精度测向新方法。首先利用SST算法对局放超声阵列信号进行聚焦处理，使得原始信号的宽频空域信息被最大限度地保留，从而实现宽带信号方位信息的累积。然后采用FDOA对聚焦后的窄带信号进行波达方向估计，FDOA无需特征分解，无需估计整个协方差矩阵，可提高运算速度，且具有更高的测向精度。在此基础之上，应用医学宽频超声信号和4′4超声阵列传感器模型，进行局放超声阵列信号测向仿真研究，仿真结果表明，测向误差小于2°，验证了该方法的正确性。
제출일충기우신호자공간전환법（signal subspace transform，SST）여쾌속자공간측향산법（fast subspace estimation of DOA ，FDOA）적국방초성진렬신호고정도측향신방법。수선이용SST산법대국방초성진렬신호진행취초처리，사득원시신호적관빈공역신식피최대한도지보류，종이실현관대신호방위신식적루적。연후채용FDOA대취초후적착대신호진행파체방향고계，FDOA무수특정분해，무수고계정개협방차구진，가제고운산속도，차구유경고적측향정도。재차기출지상，응용의학관빈초성신호화4′4초성진열전감기모형，진행국방초성진렬신호측향방진연구，방진결과표명，측향오차소우2°，험증료해방법적정학성。
A new high-precision method to orient the ultrasonic array signals of partial discharge in power transformer, which is based on the combination of signal subspace transform （SST） with fast subspace estimation of direction-of-arrival （FDOA）, is proposed. Firstly, the SST algorithm is used to focus the ultrasonic array signals of PD to reserve broadband spatial information of original signals to greatest extent to cumulate the position information of broadband signals; then FDOA is used to estimate the direction-of-arrival （DOA） of focused narrowband signals to speed up the calculation because FDOA need not eigen-decomposition, so only sub-matrix is to be estimated but not the whole covariance matrix, and a higher precision of orientation can be achieved. On this basis, the simulative research on orientation of ultrasonic array signals of partial discharge is carried out by ultrasonic wideband signals often used in medical supersonics and 4×4 plane ultrasonic array sensor model. Simulation results show that the orientation error is less than 2°, thus the correctness of the proposed method is verified.