引入双程传播损耗的近场大型目标球面逆投影成像算法研究

Near Field Imaging Algorithm of the Large Target by Considering Roundtrip Propagation Loss

球面波双程传播损耗对大型目标近场成像的幅度影响显著,通过引入双程传播损耗补偿,改进了球面逆投影算法,改进后的算法可以明显提高成像的幅度精度.同理,利用双程传播损耗补偿可以得到改进的球面卷积-逆投影算法.二者的成像质量基本相同,但前者的计算量要更小.

The roundtrip propagation loss of spherical wave is remarkable for the near-field imaging of large and complicated targets. The spherical back-projection（SBP）algorithm was modified by introducing a compensation factor for the roundtrip propagation loss. The magnitude precision of the image is increased by the modified algorithm. In the same sense, the spherical convolution back-projection（SCBP）algorithm was also modified. Comparisons of the numerical simulating between the modified SBP and the modified SCBP indicate that the precisions of the two algorithms are almost the same but the computation cost of the modified SBP is reduced.