名词
中文翻译：被动雷达
同义词：
['passive microwave radiometer', 'passive microwave detector']
例句：
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1. The new radar system has improved the accuracy of its detection.
新的雷达系统提高了其检测的准确性。
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2. The passive radar was able to detect a small object in the sky.
被动雷达能够探测到天空中的一个小物体。
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3. The military uses passive radar to monitor enemy aircraft without being detected.
军方使用被动雷达来监视敌方飞机，而不被察觉。