passive remote sensing meaning in English

被动式遥感
被动遥感
无源遥感
自然源遥感

Now a method is suggested which uses a passive remote sensing equipment - microwave radiometer for detection and identification of air object
文中提出了微波辐射计去探测和识别空中目标的方法。
The main objective of the remote sensing group is research in the fundamental remote sensing science and its applications , including active and passive remote sensing data processing and analysis
遥测技术组之主要目标为研究遥测基础科学及其发展应用，包含主动和被动式遥测资料之处理、分析及相关科学研究与应用。