侦察是由战争出现时就有的军事行动,而对敌人的搜索行动可能在战争爆发前就开始了。军事上最初的侦察、搜索敌人的行动是没有辅助工具的,以后,望远镜的发明是侦察与搜索技术发展的第一步,而当飞机和空中摄影技术用于战争时,使侦察与搜索技术得到了重大的发展。第二次世界大战期间,出现了用近红外胶片的夜间摄影技术以及雷达侦察技术。今天,几乎所有的电磁谱波段,从紫外光 Reconnaissance is a military operation that has taken place at the time of the war, and search for enemies may begin before the war breaks out. The first military scout to search for enemy operations was the absence of aids, and the invention of telescopes was the first step in the development of reconnaissance and search technology in the future, and reconnaissance and search techniques were available when aircraft and aerial photography were used in war Significant development. During World War II, night-time photography with near-infrared film and radar reconnaissance techniques emerged. Today, almost all of the electromagnetic spectrum bands from ultraviolet light