公开(公告)号：US4601043A

公开(公告)日：1986-07-15

申请号：US613665

申请日：1984-05-23

申请人： Ivan E. Hardt ,  Cynthia A. Bonebright ,  Ray C. Fuller

发明人： Ivan E. Hardt ,  Cynthia A. Bonebright ,  Ray C. Fuller

IPC分类号： H04B1/713 ,  H04B1/7156 ,  H04K1/00

CPC分类号： H04B1/7156 ,  H04B1/713 ,  H04B2001/71566

摘要： There is disclosed a digital communication system which utilizes software control through a universal synchronous/asynchronous receiver transmitter for providing improved communications performance in a digital frequency hopping communication system. The USART, under the control of a microprocessor and coupled to operate with a bit sync tracking circuit, is able to achieve synchronization and message processing of a demodulated digital signal during a receiving mode in a frequency hopping system, and initiate transmission and modulation on the pseudorandom hopping frequencies of the communication system. The USART functions as a data input/output device and may be multiplexed to handle the differing data rate for user and frame/burst data for transmission.

摘要翻译： 公开了一种通过通用同步/异步接收机发射机利用软件控制的数字通信系统，用于在数字跳频通信系统中提供改进的通信性能。 USART在微处理器的控制下并且被耦合以与位同步跟踪电路一起操作，能够在跳频系统的接收模式期间实现解调数字信号的同步和消息处理，并且启动对 通信系统的伪随机跳频。 USART用作数据输入/输出设备，并且可以被多路复用以处理用于用户和帧/突发数据的不同数据速率以用于传输。

公开(公告)号：US4807248A

公开(公告)日：1989-02-21

申请号：US613659

申请日：1984-05-23

申请人： Roger A. Pyatt ,  Ivan E. Hardt ,  Cynthia A. Bonebright

发明人： Roger A. Pyatt ,  Ivan E. Hardt ,  Cynthia A. Bonebright

IPC分类号： H04B1/713 ,  H04B1/7156 ,  H01K1/00 ,  H04L9/00

CPC分类号： H04B1/7156 ,  H04B1/713 ,  H04B2001/71563 ,  H04B2001/71566

摘要： There is disclosed a technique for providing resynchronization for message reception in digital transmission systems, and particularly in digital frequency hopping systems employing data framing techniques. In the transmission of framed data using known digital techniques for frequency hopping systems, synchronization is provided in frames preceding the message frames transmitting digital data. In addition, resynchronization information is transmitted in subsequent frames which are interspersed with data frames including the message data. A predetermined number of frames is set to provide all the resynchronization information so that once those frames have been detected, a receiver will have acquired resynchronization during message transmission. This technique allows improved signal acquisition by providing an opportunity following the first conventional synchronization frame to acquire synchronization or to reacquire synchronization during message transmission.

摘要翻译： 公开了一种用于在数字传输系统中，特别是在采用数据成帧技术的数字跳频系统中提供用于消息接收的再同步的技术。 在使用用于跳频系统的已知数字技术的帧数据传输中，在发送数字数据的消息帧之前的帧中提供同步。 另外，重新同步信息是在包含消息数据的数据帧散布的后续帧中发送的。 设置预定数量的帧以提供所有重新同步信息，使得一旦检测到这些帧，接收机将在消息传输期间获得重新同步。 该技术允许通过提供在第一常规同步帧之后的机会来获得同步或在消息传输期间重新获取同步来改进信号捕获。