复杂电磁环境基础知识（Basic knowledge of complex electromagnetic environment）.docVIP

复杂电磁环境基础知识（Basic knowledge of complex electromagnetic environment） I. concept Complex electromagnetic environment is in limited time and space, a band, a variety of electromagnetic signals in dense, overlapping, hinder the information system and the electronic equipment work of battlefield electromagnetic environment using weapons and combat operations have a significant impact. Two, the formation of complex electromagnetic environment (1) electromagnetic activity is the basis for the formation of electromagnetic environment Electromagnetic activity is based on electromagnetic radiation, propagation and reception of all kinds of military and civilian activities using electromagnetic waves, as well as scientific experiments and research behaviors. In the field of electromagnetic applications, electromagnetic spectrum is formed by arranging electromagnetic waves in order of frequency or wavelength. Radio waves and light waves, including X rays, are electromagnetic waves, but are very different in frequency or wavelength. Radio wave is mainly used for communication, and it is the earliest field of human electromagnetic activity. In the Russo Japanese war in 1904, radio was used by both sides. Radar is widely used in military, national economy and scientific research and other fields of electronic equipment. In 1935, Britain designed the worlds first practical radar. Since 70s, optical communication and laser guided and distance is widely used in the battlefield, expand the battlefield electromagnetic environment category, especially the use of high power laser, the battlefield electromagnetic environment to deeper development. (two) electronic warfare activities lead to complex evolution of Battlefield Electromagnetic Environment Communication countermeasures, radar countermeasures and electro-optical countermeasures are the three basic and most widely used electronic countermeasures. The communication countermeasure is to use the jamming signal or the interference noi