RQ-4A“全球鹰”的结构介绍

“全球鹰”机身长13.5米，高4.62米，翼展35.4米，最大起飞重量11622千克。翼展和波音747相近，因此“全球鹰 ”是一种巨大的无人机。“全球鹰” 机载燃料超过7吨，最大航程可达25945千米，自主飞行时间长达41小时，可以完成跨洲际飞行。可在距发射区5556千米的范围内活动，可在目标区上空18288米处停留24小时。飞行控制系统采用GPS全球定位系统和惯性导航系统，可自动完成从起飞到着陆的整个飞行过程。

The Global Hawk is 44.4 ft. long, 15.2 ft height, wingspan 116.2 ft., Weight 25,600 lbs. The wingspan is similiar to the Boeing 747, so it is a very large UAV. It can carry over 7t fuel, maxium range 25945km, and is able to self-control over-continent flight for 41 hours. In another word, it can fly to 5556km away from the base, stay there for 24 hours 60000ft high. The flight control system contains GPS & INS, which insured auto takeoff & landing, as well as the whole flight process.

德国装备的全球鹰：

德国即将装备的“全球鹰”，与美国型号有少许区别

“全球鹰”可同时携带光电、红外传感系统和合成孔径雷达。光电传感器工作在0.4到0.8微米波段，红外传感器在3.6到5微米波段。光电系统包括第三代红外传感器和一个柯达(KODAK)数字式电耦合器件(CCD)。合成孔径雷达具有一个X波段、600MHZ、3.5千瓦峰值的活动目标指示器。该雷达获取的条幅式侦察照片可精确到1米，定点侦察照片可精确到0.30米。对以每小时20到200千米行驶的地面移动目标，可精确到7千米。一次任务飞行中，“全球鹰 ”既可进行大范围雷达搜索，又可提供7.4万平方千米范围内的光电/红外图像，目标定位的圆误差概率最小可达20米。装有1.2米直径天线的合成孔径雷达能穿透云雨等障碍，能连续的监视运动的目标。

The more advanced advantage of the Global Hawk is that linked with systems such as the Joint Deployable Intelligence Support System (JDISS) and the Global Command and Control System (GCCS), imagery may be transferred NRT to the operational commander for immediate use, such as targeting, warning, fast attack & re-attack and combat evaluation. And the RQ-4A is capable to fit for different communicaion and control systems of Army, Airforce or Navy. It can use broadband satellite communication as well as the line-of-sight data transmission. The broadband system is good support up to 274 megabits per second, but not currently supported, and 50 megabits per second by a Ku band SATCOM. Global Hawk also carries back-up datalinks.