Scientists in Beijing have created 'the world's most powerful spy camera' which can pick out facial details from distances exceeding 63 miles (100km).
New laser-based imaging technology is reportedly capable of capturing millimeter resolution from over 60 miles away.
It means the spy camera could potentially be floating in space aboard a satellite while clearly seeing faces on Earth's surface.
Pictured is China's Tiangong Space Station
From LiveScience by Alan Bradley
Scientists in China have created a satellite with laser-imaging technology powerful enough to capture human facial details from more than 60 miles (100 kilometers) away.
This breakthrough represents a performance increase of 100 times or more compared to leading spy cameras and traditional telescopes, according to a report on the new technology in the South China Morning Post.
Amongst a broad gamut of potential applications, the technology could allow operators to surveil foreign satellites to a previously impossible level of detail.
The researchers at China’s Academy of Sciences’ Aerospace Information Research Institute outlined their findings in a new study published in the Chinese Journal of Lasers (Issue 52, Volume 3).
According to the South China Morning Post, the scientists conducted a test across Qinghai Lake in the northwest of the country with a new system based on synthetic aperture lidar (SAL), a type of laser radar capable of constructing two-dimensional or three-dimensional images.
According to the South China Morning Post, the scientists conducted a test across Qinghai Lake in the northwest of the country with a new system based on synthetic aperture lidar (SAL), a type of laser radar capable of constructing two-dimensional or three-dimensional images.
Chinese scientists' laser-based system could reportedly spy on Earth and scrutinise foreign military satellites with unparalleled precision
How this new powerful spy satellite works
SAL relies on the motion of an object (like a satellite) to provide finer resolution images than other, beam-scanning radar imagery systems.
SAL relies on the motion of an object (like a satellite) to provide finer resolution images than other, beam-scanning radar imagery systems.
Previous SAR systems have relied on microwave radiation, which has longer wavelengths, which results in lower resolution images.
However, this new system operates at optical wavelengths, which have much shorter wavelengths than microwaves and produce clearer images (though microwaves are better for penetrating into materials, because their longer wavelengths aren’t scattered or absorbed as easily).
However, this new system operates at optical wavelengths, which have much shorter wavelengths than microwaves and produce clearer images (though microwaves are better for penetrating into materials, because their longer wavelengths aren’t scattered or absorbed as easily).
This image shows the targets at one end of the lake top left (spelling out 'AIR') and their SAL imaging result (top right).
Bottom, a scene showing the placement of six pyramids and the SAL imaging result
This is a huge leap forward from previous milestones, like a 2011 test conducted by defense firm Lockheed Martin that was able to achieve an azimuth resolution of 0.79 inches (2 centimeters) from only 1 mile (1.6 km) away, or a Chinese test where scientists achieved a then-best 1.97 inch (5 cm) resolution at a distance of 4.3 miles (6.9 km).
To achieve this latest breakthrough, the Chinese team split the laser-beam driving the lidar system across a 4x4 micro-lens array, which in turn expanded the system’s optical aperture — the opening that controls the amount of light entering a camera system — from 0.68 to 2.71 inches (17.2 mm to 68.8 mm).
The experts conducted a successful test across the huge Qinghai Lake in the north-west of China
In this way, researchers could bypass the tradeoff of field of vision versus size of aperture, which has historically restricted such camera systems.
It’s important to note that testing took place during near perfect weather and atmospheric conditions with steady wind and limited cloud cover.
It’s important to note that testing took place during near perfect weather and atmospheric conditions with steady wind and limited cloud cover.
Inclement weather or other impairments to visibility could significantly impact the system’s precision and reliability.
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