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关注：1
2013-05-23 12:21
求翻译：At wavelengths longer than the thermal infrared region, i.e. at the microwave region, the energy (radiation) level is very low. Therefore, we often use human-made energy source to illuminate the target (such as Radar) and to collect the backscatter from the target. A remote sensing system relying on human-made energy s是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
At wavelengths longer than the thermal infrared region, i.e. at the microwave region, the energy (radiation) level is very low. Therefore, we often use human-made energy source to illuminate the target (such as Radar) and to collect the backscatter from the target. A remote sensing system relying on human-made energy s
问题补充： |
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2013-05-23 12:21:38
在波长长于热红外区域，即在微波区域中，能量（辐射）的水平是很低的。
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2013-05-23 12:23:18
正在翻译，请等待...
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2013-05-23 12:24:58
正在翻译，请等待...
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2013-05-23 12:26:38
在波长长于热红外区域，即在该微波区域能源 (辐射) 水平是非常低的。因此，我们经常用人类取得的能源来源，照亮目标 （如雷达)，从目标收集后向散射。遥感系统依靠人类取得的能源称为"活跃"遥感系统。远程遥感依托能源来源，不是人为的被称为"被动"遥感。
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2013-05-23 12:28:18
正在翻译，请等待...
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