1. There are many methods for classifying electromagnetic interference sources. Generally speaking, electromagnetic interference sources can be divided into two categories: natural interference sources and human interference sources. The main sources of natural interference come from astronomical noise in the atmosphere and cosmic noise in the outer space of the Earth. They are not only a fundamental component of the Earth's electromagnetic environment, but also a source of interference to radio communication and space technology. Natural noise can interfere with the operation of artificial satellites and spacecraft, as well as the launch of ballistic missile launch vehicles. Human interference sources are electromagnetic energy interference generated by electromechanical or other artificial devices, some of which are devices specifically used to emit electromagnetic energy, such as radio equipment such as broadcasting, television, communication, radar, and navigation, and are called intentional emission interference sources. The other part is the emission of electromagnetic energy while completing its own functions, such as transportation vehicles, overhead transmission lines, lighting fixtures, electric machinery, household appliances, industrial and medical RF equipment, etc. Therefore, this part becomes an unintentional emission interference source. 1.2. From the perspective of electromagnetic interference properties, it can be divided into functional interference sources and non functional interference sources. Functional interference sources refer to direct interference caused by devices to other devices during the process of realizing their functions; Non functional interference sources refer to the side effects that occur or are added to the electrical device while achieving its own functions, such as arc discharge interference caused by switch closure or disconnection. 1.3. From the spectrum width of electromagnetic interference signals, they can be divided into broadband interference sources and narrowband interference sources. They are distinguished by their bandwidth relative to the specified receptors. If the bandwidth of the interference signal exceeds the specified sensor bandwidth, it becomes broadband interference, and vice versa, it is called a narrowband interference source
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