Radar, a transliteration of radar in English, is derived from the abbreviation of radio detection and ranging, which means "radio detection and ranging", that is, using radio methods to find targets and determine their spatial positions.
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The advantage of radar is that it can detect long-distance targets day and night, and is not blocked by fog, cloud and rain.
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The first electromagnetic wave length used for search radar was 23cm, which was defined as L-band (the prefix of English long). Later, the central wave length of this band became 22cm.
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The role of radar is similar to that of eyes and ears. Of course, it is no longer a masterpiece of nature.
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The specific uses and structures of various radars are different, but the basic forms are the same, including transmitter, transmitting antenna, receiver, receiving antenna, processing part and display.
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The emergence of radar is due to the urgent need for a radar (Technology) that can detect metal objects in the air during the war between Britain and Germany during World War I, which can help search for German aircraft in the anti air raid war.
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Radar was invented through bats. It is a transliteration of radar in English, which comes from the abbreviation of radio detection and ranging, which means "radio detection and ranging"
2022/04/25
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