基于系统函数优化的非规则天线阵列综合孔径辐射计亮温反演算法

为改善非规则天线阵列综合孔径辐射计反演图像质量,提出了基于系统函数优化的亮温反演方法。通过优化非规则天线阵列的系统函数,消除单元天线非规则排列对系统性能的影响,并在优化过程中引入正则化,稳定反演图像。为补偿正则化引起的反演图像质量损失,在反演算法中引入了迭代运算。仿真结果表明:所提出的反演算法能有效改善非规则天线阵列综合孔径辐射计的亮温反演图像质量,可应用于基于小卫星编队的分布式综合孔径遥感图像反演中,并能为基于小卫星编队的分布式综合孔径阵列优化提供理论基础。

Reconstruction Method for Nonuniform Aperture Synthesis Radiometers Based on System Function Optimization

In order to improve the reconstruction quality of nonuniform aperture synthesis radiometers (NASRs), the reconstruction method based on system function optimization is proposed in this paper for the first time. In the method, the system function of NASRs is optimized to mitigate the impact of nonuniformly distributed antennas on the system performance. In the process of optimization, the regularization is introduced to stabilize reconstructed images. However, the regularization degrades the reconstruction quality. To compensate for the loss of the reconstruction quality, the iteration method is introduced. The numerical results demonstrate that the method can effectively improve the quality of reconstruction images for non-ideal NASRs,which can be applied to image reconstruction of distributed aperture synthesis radiometers (ASRs) based on satellite formation flying. Additionally, this work can provide a valuable theoretical basis for array configuration optimization of distributed ASRs.