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    • 7. 发明授权
    • Synchronous/asynchronous independent single sideband acoustic telemetry
    • 同步/异步独立单边带声学遥测
    • US4432079A
    • 1984-02-14
    • US317357
    • 1981-11-02
    • Gerald R. MackelburgStanley J. WatsonAlan Gordon
    • Gerald R. MackelburgStanley J. WatsonAlan Gordon
    • H04B1/68H04B11/00H04J1/04
    • H04B1/68H04B11/00H04J1/04
    • An undersea communications system provides for improved data transmission pabilities. Two separate sources of information respectively modulate the upper and the lower sidebands of an acoustic carrier. The discretely modulated sidebands are simultaneously transmitted without the acoustic carrier or the acoustic carrier can be added to allow asynchronous or synchronous demodulation and use of the two modulating informations. Separation of the information in the two discretely modulated sidebands is assured by shifting the modulating information to ultrasonic regions and filtering out upper and lower sidebands of modulating information. Next, the shifted sidebands are modulated by an acoustic carrier which, optionally, is transmitted along with the discretely modulated upper and lower sidebands. A phase locked loop in the receiver portion assures synchronous demodulation or a crystal oscillator allows asynchronous demodulation of the discretely modulated upper and lower sidebands.
    • 海底通信系统提供改进的数据传输能力。 两个独立的信息源分别调制声载波的上边带和下边带。 离散调制的边带在没有声载波或声载波的情况下被同时传输,以允许异步或同步解调和使用两个调制信息。 通过将调制信息移动到超声波区域并滤除调制信息的上边和下边带来确保两个离散调制边带中信息的分离。 接下来,移动的边带由声载波调制,声载波可选地与离散调制的上边带和下边带一起传输。 接收器部分中的锁相环确保同步解调,或者晶体振荡器允许离散调制的上边带和下边带的异步解调。
    • 9. 发明授权
    • Precision doppler effect compensator
    • 精密多普勒效应补偿器
    • US4905211A
    • 1990-02-27
    • US326951
    • 1989-03-22
    • Gerald R. MackelburgStanley J. WatsonJayson T. DurhamAlan Gordon
    • Gerald R. MackelburgStanley J. WatsonJayson T. DurhamAlan Gordon
    • H04B11/00
    • H04B11/00Y10S367/904
    • A precision Doppler effect compensator provides Doppler compensation in astic transmission by simultaneously sending a known reference signal with an information signal. The information signal and reference signal undergo identical Doppler effects. The compensator uses the Doppler shifted reference signal to sample the analog Doppler affected information signal. The analog information signals are digitally converted and stored in a first in first out shift register. The samples are read out of the FIFO at a rate corresponding to the frequency of a non-Doppler shifted reference signal so as to precisely reconstruct the information signal as transmitted. The samples read from the FIFO are reconverted from digital to analog form to be presented to a receiving modem for further information processing.
    • 精密多普勒效应补偿器通过同时发送具有信息信号的已知参考信号来提供声传播中的多普勒补偿。 信息信号和参考信号经历相同的多普勒效应。 补偿器使用多普勒偏移参考信号对模拟多普勒影响的信息信号进行采样。 模拟信息信号被数字转换并存储在先进先出移位寄存器中。 样本以与非多普勒偏移的参考信号的频率相对应的速率从FIFO读出,以便精确地重构所发送的信息信号。 从FIFO读取的样本从数字模式转换为模拟形式,以呈现给接收调制解调器以进一步进行信息处理。