TJS系列很特殊,通信技术实验卫星只是个名字,其实是各种各样的同步轨道特殊用途卫星。你只要看到tjs,就要知道这是同步轨道特殊用途的卫星,大多数不是去验证通信技术的。tjs-1据信是一颗拥有32米可展开环形天线的电子信号监听卫星。类似当年的长空一号的作用,专门监听收集美国佬的电子信号 ,还有日韩台的tjs-2据信是一颗基于风云4号平台的早期预警卫星。tjs-3,tjs-4还不清楚具体用途。这颗tjs-5显然是一颗和tjs-2类似的以风云4号平台为基础的早期预警卫星。
Nowadays, even in low light conditions, digital camera can quality pictures with higher ISO, noise and hot pixels have been gradually reduced. Sony has introduced back illumination process for consumer market. Sony BSI sensors evolved from Exmor to now Exmor RS( stacked) technology. This stacked technology allows further chip size reduction, which has strong demands in smartphone camera market. Digital astrophotography is also benefited from such advances, utilising Back Side Illumination technology Exmor: Within the CMOS sensor, it outputs low-noise digital signals by "on-chip column AD conversion" and "dual noise reduction" to suppress noise in the first half of the process In low light conditions, when a wide aperture is desirable to collect as much light as possible. At apertures wider than f/2.0, back-illuminated Exmor R sensors are significantly more efficient at collecting light than conventional, front-illuminated sensor...
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