公开(公告)号：US4432079A

公开(公告)日：1984-02-14

申请号：US317357

申请日：1981-11-02

Applicant: Gerald R. Mackelburg ,  Stanley J. Watson ,  Alan Gordon

Inventor： Gerald R. Mackelburg ,  Stanley J. Watson ,  Alan Gordon

IPC: H04B1/68 ,  H04B11/00 ,  H04J1/04

CPC classification number: H04B1/68 ,  H04B11/00 ,  H04J1/04

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US3944967A

公开(公告)日：1976-03-16

申请号：US535542

申请日：1974-12-23

Applicant: Robert S. Acks ,  Stanley J. Watson ,  Howard B. McCracken

Inventor： Robert S. Acks ,  Stanley J. Watson ,  Howard B. McCracken

IPC: G01S3/808 ,  G01S3/80

CPC classification number: G01S3/8083 ,  Y10S367/91

Abstract: In a diver's navigation system employing a receiver having three equal, alarly disposed hydrophone locations, a digital signal processing circuit is employed which receives frequency shift keyed digital data from remote beacons. Circuitry is provided to process this data to derive a bearing indication to the beacon.

Abstract translation: 在潜水员的导航系统中，采用具有三个相等的，角度设置的水听器位置的接收器，采用数字信号处理电路，其从远程信标接收频移键控的数字数据。 提供电路以处理该数据以导出信标的方位指示。