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計概作業(28.29號)
1.
通訊頻道、微波、通訊衛星和T載波 陳怡晴、周宛穎
2.
通訊衛星-1 通訊衛星(COMMUNICATIONS SATELLITE,簡稱「CS」) 是太空中應用於通信的人造衛星。 現代通訊衛星使用地球同步軌道、莫尼亞(MOLNIYA)軌道或低緯度軌道。 衛星軌道離地很高,天線波束能覆蓋地球廣大面積, 且電波傳播不受地形限制,能實現地面遠距離通訊。
3.
通訊衛星-2 衛星裝有由接收和發射設備組成的轉發器,將收到的信號經放大、移頻後發射 給地面, 軌道高度和傾角可有多種,但常用的是對地靜止軌道, 如果用3-4顆對地靜止軌道上的通訊衛星組網,可以實現全球實時通訊, 這種衛星除了具有人造衛星一般的分系統設備外, 還裝有通訊轉發器、對地姿態穩定控制、對地定向天線、衛星位置保持等分系 統設備。 通訊衛星是為了補足海底電纜通信的不足,通常用於移動通信。 如船隻或飛機等遠離陸地的交通工具,無法使用有線通訊時,便需要通訊衛星。
4.
T載波-1 1.中文名稱:T載波 2.英文名稱:T CARRIER 3.定義:美國的准同步數字系列標准中,各個等級時分複用系統和設備的總稱。 4.應用學科:通信科技(一級學科);線纜傳輸與接入(二級學科) 以上內容由全國科學技術名詞審定委員會審定公布
5.
T載波-2 常見的有T1、FRAC-TIONAL T1、T3, 其中T1、T3屬于T載波系統(T-CARRIER SYSTEM),是貝爾實驗室于1960年 代所研發, 爲了在數位傳輸線上傳送語音訊號所發展的多工傳送方式, 其資料傳送速度分別是1.544MBPS,44.736MBPS, FRACTIONAL
T1是指將T1的頻寬加以分割,提供給頻寬需求低于T1速度的使 用者。
6.
通訊頻道-1 1. 定義:是信號在通信系統中傳輸的通道,由信號從發射端傳輸到接收端所 經過的傳輸媒介所構成。 2. 狹義通道的分類:有線通道、無線通道和存儲通道 3.
有線通道:有線通道以導線為傳輸媒介,信號沿導線進行傳輸,信號的能 量集中在導線附近,因此傳輸效率高,但是部署不夠靈活。EX.電話線 4. 無線通道:以輻射無線電波為傳輸方式的無線電通道和在水下傳播聲波的 水聲通道等,因為在自由空間上傳播信號,所以傳輸效率較低,並且很容 易被他人截獲。但是,無線通信擺脫了對導線的依賴。 5. 存儲通道:磁帶、光碟、磁碟等數據存儲媒質可以被看作是一種通信通道。
7.
通訊頻道-2 • 廣義通道的分類:按照其功能進行劃分,可以分為調制通道和編碼通道。 • 調制通道:指信號從調制器的輸出端傳輸到解調器的輸入端經過的部分。 •
編碼通道:指數字信號由編碼器輸出端傳輸到解碼器輸入端經過的部分。
8.
微波(MICROWAVE) • 定義:指波長介於紅外線和特高頻(UHF)之間的電磁波。微波的波長範 圍大約在1M至1MM之間,所對應的頻率範圍是 300MHZ至300GHZ。 •
微波在雷達科技、ADS射線武器、微波爐、電漿發生器、無線網路系統 (如手機網路、藍芽、衛星電視及無線區域網路技術等)、感測器系統上 均有廣泛的應用。 • 在技術領域協定使用的四個頻率分別為800MHZ,2.45GHZ,5.8GHZ和 13GHZ。微波爐使用2.45GHZ,此頻率亦被作為ISM波段,使用在航空通 訊領域。
9.
END 感謝聆聽
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