華盛頓領空遭無人機入侵 空域安全存在漏洞

4月23日導讀：

[本日voa聽抄音頻時光為:02分28秒]

He was quickly surrounded and taken away by police,his aircraft was checked for explosives, and now hefaces several years of prison.

But his stunt highlighted once more that the airspace around most of the public buildings iseasily penetrated by drones and light piloted aircraft, too small and flying too low to be safelyprevented from reaching their goals.

John Hansman a professor of Aeronautics and Astronautics at Massachusetts Institute ofTechnology, said small, flying vehicles are not easy to detect and stop.

“If you have a very small target, like a gyrocopter, which doesn't have a very large radar cross-section, so it's not reflecting much energy back, and it's close to the ground, you might getsome signal coming there, but you may actually think it's a building or a car moving on theground, not a helicopter."

Hansman says heavy traffic in downtown Washington makes it even more difficult.

“If you have a complex environment like an area around Washington where you have lots ofother vehicles on the ground, you have vehicles in the air, and you have something very smalllike this, it's actually not that difficult for it to slip through the protection.”

The chairman of the American Leadership and Policy Foundation, David Stuckenberg, is a formermilitary pilot who writes about the airspace security.Speaking via Skype, he said the presentsafety systems are inadequate.

“We need to understand that we've been lucky and as technology increases and as dronesproliferate people will increasingly look at these as weapons of opportunity or technologiesthat can be adapted for ill intent.”

Stuckenberg said a lot more needs to be done before such systems are in place, such asconducting thorough analyses and bringing new regulations.