陆基(舰载)警戒雷达受地球曲率的影响,探测距离近,预警时间短。为克服雷达的局限性,国外已采用多种手段进行空中预警。这些手段各有利弊,应用场合不一,其中预警机是最有效的空中预警手段。预警机升限高,机载雷达探测距离远达400多公里,预警时间长达25分钟;飞行速度快,机动灵活,生存能力较强;机舱容积大, Land-based (shipborne) surveillance radar is affected by the curvature of the Earth, with a short detection range and short warning time. In order to overcome the limitations of the radar, various means have been adopted by foreign countries for aerial warning. These measures have their own advantages and disadvantages, the application of different occasions, including early warning aircraft is the most effective means of early warning. AWACS ceiling high, airborne radar detection range up to more than 400 kilometers, warning time up to 25 minutes; flight speed, flexible, strong survivability; large cabin volume,