How do you know where you are going underwater?
Submarine Navigators and Quartermasters use ocean navigational charts just like other ships, but probably pay closer attention to the depth of water. Submarines have a computer that knows how fast the ship is going and in what direction. This computer can also sense when the submarine turns; the Quartermaster sets a position where the ship starts from and the computer keeps track of where the ship is at any time after that. Submarines also have an antenna that can receive signals from Global Positioning System (GPS) satellites when near enough to the surface to receive a signal. When on the surface, the quartermasters may use a sextant to obtain navigation fixes as a backup to our modern day systems.
譯:在水下你(潛艦)如何知道要往哪兒去?
潛艦上的航海官及航海士官長們使用的海圖跟其他船舶是一樣的,不過或許對水深會比較注意。潛艦上面有一部可以知道航行的速度以及航向的計算機(電腦),而這部計算機也能感測潛艦的轉向;航海士官長會先設定好船位的起始位置,之後計算機會一直隨時保持潛艦位置的軌跡。當離水面夠近到足以收到信號的時候,潛艦也有一組天線可以接收來自全球定位系統(GPS)衛星的信號。當在水面時,航海士官長們可以使用六分儀來獲得航行定位以作為我們現代定位系統的備用資料。
翻得不好,請多包含
d2211 wrote:jljl wrote:
潛艇下潛後在一定深度內是使用拖曳式天線以ELF(超低頻)來通信,並可利用於接收衛星的定位,在完成定位校正後則以精密慣性導航來行駛,據聞美蘇先進科技一次定位校正後可以持續18天.....
小弟想冒昧的請教一下jljl大大上述資訊是從何得知的,沒有冒犯的意思,只是想長長見聞
因為就小弟理解,GPS信號屬於SHF頻段,照理來說潛艦的VLF或ELF天線是根本不可能接收,而且SHF的信號似乎也無法穿透水面到水下深處,因為那只有VLF或ELF的電磁波才辦得到
可否幫小弟釋疑一下?感激不盡:)
sorry ! 是小弟語意不清,而且您似乎已自己找到答案了!
我原意是分成二部份,潛艇下潛後在一定深度內可以使用拖曳式天線以ELF(超低頻)來進行通信,這是回覆幾位朋友有關水下通信的問題;而衛星訊號則是以主天線或拖曳式天線來接收,當然一樣會有深度的限制.....
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