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引用次数: 3
摘要
DORT (decomposition de lpsilaoperateur de retourporel)方法是一种有效的将信号聚焦到目标上的方法。DORT方法要求测量阵列中所有元对的传播介质的元间脉冲响应。从这些响应中推导并对角化了时间反转算子。但对于非理想分辨散射体，当两个散射体放置得很近时，DORT方法的效果较差。因此，本文提出了加权最小二乘(WLS)与DORT方法相结合，在非理想分辨散射体情况下进行选择性聚焦。该方法可以实现比原DORT方法更高的空间分辨率和比自适应波束形成方法更快的计算速度的目标聚焦。
Weighted least squares DORT method in selective focusing
The DORT (decomposition de lpsilaoperateur de retournement temporel) method is an efficient technique to focus signal on the target. The DORT method requires the measurement of the inter-element impulse responses of the propagating medium for all pairs of elements in the array. The time reversal operator (TRO) is deduced and diagonalized from these responses. But DORT method has worse results in non-ideally resolved scatterer case that two scatterers are placed close with each other. Therefore, in this paper, weighted least-squares (WLS) combining with the DORT method are proposed to perform selective focusing in non-ideally resolved scatterer case. This technique can also perform target focusing with higher spatial resolution than original DORT method and faster computation than adaptive beamforming method.
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