A Calculation Method of Electromagnetic Scattering of Space Targets Based on a Combination of Compression Block Scheme and MLFMA

To meet the increasing demand for efficient computation of electromagnetic scattering characteristics of space targets, a high-efficiency methodology for electromagnetic scattering calculations that integrates the compressed block scheme (CBS) with the multi-level fast multipole algorithm (MLFMA) is presented in this paper. This approach effectively addresses the challenges of excessively large impedance matrix size, high computational complexity, and low iterative solution efficiency in calculating the electromagnetic characteristics of space targets. Specifically, it employs the octree chunking operation of MLFMA to naturally divide the far-field impedance matrix into multiple sparse matrix blocks, and then uses CBS to compress and store them, effectively accelerating the vector multiplication of sparse matrix while significantly reducing memory consumption. Furthermore, the storage volume is further compressed by sharing the source function index during the storage process. Experimental results obtained from models of spheres, cubes, amygdalae, and satellites indicate that the proposed method effectively improves computational efficiency while maintaining high accuracy, thereby rendering it suitable for the rapid and precise determination of the electromagnetic scattering properties of space targets with complex structures.