“passive electronic countermeasures”的概念、定义、翻译、参考文献-科学参考

单词	passive electronic countermeasures
释义	passive electronic countermeasures [`pas·iv i´lek`trän·ik `kau̇nt·ǝr´mezh·ǝrz] ^ELECTRONICS Electronic countermeasures that do not radiate energy, including reconnaissance or surveillance equipment that detects and analyzes electromagnetic radiation from radar and communications transmitters, and devices such as chaff which return spurious echoes to enemy radar.
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