发信人: dahuang (Straightman), 信区: Aero
标 题: 海盾号接收信号为33.3kHz而非37.5kHz
发信站: 水木社区 (Mon Apr 7 23:49:22 2014), 站内
http://abcnews.go.com/International/wireStory/ping-discovery-prompts-phase-plane-search-23219127
THE SIGNALS
U.S. Navy Capt. Mark Matthews said on both occasions the Ocean Shield detected sounds, the pings were emitted about 1 second apart — consistent with those that could be sent from the black boxes: the flight data recorder and cockpit voice recorder.
The signals were broadcast at 33.3 kilohertz rather than the 37.5 kilohertz frequency at which black boxes are supposed to broadcast pings. Matthews said that according to the manufacturer, the frequency of the black boxes can drift near the end of the device\'s shelf life, which is about six years.
Matthews said the signals are man-made. He said there\'s always the possibility they\'re getting a false reading, for instance from a device on their own ship, but they are careful to avoid that.
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※ 来源:·水木社区 newsmth.net·[FROM: 118.186.220.*]
标 题: 海盾号接收信号为33.3kHz而非37.5kHz
发信站: 水木社区 (Mon Apr 7 23:49:22 2014), 站内
http://abcnews.go.com/International/wireStory/ping-discovery-prompts-phase-plane-search-23219127
THE SIGNALS
U.S. Navy Capt. Mark Matthews said on both occasions the Ocean Shield detected sounds, the pings were emitted about 1 second apart — consistent with those that could be sent from the black boxes: the flight data recorder and cockpit voice recorder.
The signals were broadcast at 33.3 kilohertz rather than the 37.5 kilohertz frequency at which black boxes are supposed to broadcast pings. Matthews said that according to the manufacturer, the frequency of the black boxes can drift near the end of the device\'s shelf life, which is about six years.
Matthews said the signals are man-made. He said there\'s always the possibility they\'re getting a false reading, for instance from a device on their own ship, but they are careful to avoid that.
--
※ 来源:·水木社区 newsmth.net·[FROM: 118.186.220.*]
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