InterRange Instrumentation Group(IRIG-B(AC))code is usually used in the shooting range test for time information transmission and systems time synchronization.According to IRIG-B(AC)code format and modulation pr...InterRange Instrumentation Group(IRIG-B(AC))code is usually used in the shooting range test for time information transmission and systems time synchronization.According to IRIG-B(AC)code format and modulation principle,this paper presents IRIG-B(AC)coding circuit design scheme based on field programmable gate array(FPGA).The B(AC)code signal is generated by AD7245,a digital-to-analog(D/A)converter.After amplified,the signal can be used directly for system time synchronization,and the amplitude of the signal can be adjusted according to different requirements.The IRIG-B(AC)encoder designed has been verified by test.The test results show that it can output accurate time information and has higher practicality.展开更多
针对卷积-RS码级联译码器中的帧同步问题,提出了一种高速并行结构。该结构采用符号域同步算法替代传统的比特域同步算法,克服了传统级联译码器中帧同步器的速率瓶颈。该算法使用多路并行相关,再由状态机根据各路相关结果进行同步判断。...针对卷积-RS码级联译码器中的帧同步问题,提出了一种高速并行结构。该结构采用符号域同步算法替代传统的比特域同步算法,克服了传统级联译码器中帧同步器的速率瓶颈。该算法使用多路并行相关,再由状态机根据各路相关结果进行同步判断。设计中同时考虑了帧头容错和抗滑码功能。在Stratix II FPGA上,该帧同步器结构的实现可以达到1.2 Gbit/s以上的数据处理速率。展开更多
基金The 10th Postgraduate Science and Technology Fund of North University of China(No.20131020)
文摘InterRange Instrumentation Group(IRIG-B(AC))code is usually used in the shooting range test for time information transmission and systems time synchronization.According to IRIG-B(AC)code format and modulation principle,this paper presents IRIG-B(AC)coding circuit design scheme based on field programmable gate array(FPGA).The B(AC)code signal is generated by AD7245,a digital-to-analog(D/A)converter.After amplified,the signal can be used directly for system time synchronization,and the amplitude of the signal can be adjusted according to different requirements.The IRIG-B(AC)encoder designed has been verified by test.The test results show that it can output accurate time information and has higher practicality.
文摘针对卷积-RS码级联译码器中的帧同步问题,提出了一种高速并行结构。该结构采用符号域同步算法替代传统的比特域同步算法,克服了传统级联译码器中帧同步器的速率瓶颈。该算法使用多路并行相关,再由状态机根据各路相关结果进行同步判断。设计中同时考虑了帧头容错和抗滑码功能。在Stratix II FPGA上,该帧同步器结构的实现可以达到1.2 Gbit/s以上的数据处理速率。