Theoretical Basics of Polarization Synthetic Aperture Radar

People have realized and been studying electromagnetic phenomena for thousands of years. However, electricity and magnetism have been treated independently for a long time, and knowledge has never been beyond the scope of qualitative understanding. Until the middle of the nineteenth century, the British physicist J. C. Maxwell inherited the field method of Faraday’s electromagnetism, and creatively proposed the concept of displacement current. Therefore, the macroscopic electromagnetic field equations—Maxwell’s equations and the electromagnetic wave theory of light are established. His achievements laid the foundation for the study of electromagnetic field theory and opened up a new era of knowing electromagnetic wave and making benefit for human society.