ZHOU Cai-qin， LI Shi-zhong， LIANG Guo-qiang
(College of Mechatronic Engineering, North University of China, Taiyuan 030051, China)
Abstract： 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.
Key words： IRIG-B(AC) code; field programmable gate array (FPGA); amplitude modulation; time synchronization
CLD number： TN99Document code： A
Article ID： 1674-8042（2015）03-0291-05 doi： 10.3969/j.issn.1674-8042.2015.03.016
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基于FPGA的IRIG-B(AC）编码器设计
周彩亲， 李世中， 梁国强
（中北大学 机电工程学院， 山西 太原 030051）
摘要: IRIG-B(AC)码常用于靶场试验中传递时间信息和同步各系统时间。 根据IRIG-B(AC)码的格式及调制原理， 介绍了基于FPGA的IRIG-B(AC)编码电路的设计。 利用AD7245实现D/A转换转换产生B(AC)码信号， 信号经放大后可直接用于系统时间同步， 而且信号幅度可根据不同的使用需求进行调节。 经测试验证， 本系统输出的时间信息准确无误， 有较高的实用性。
关键词: IRIG-B(AC)码； FPGA； 调幅； 时间同步
引用格式：ZHOU Cai-qin， LI Shi-zhong， LIANG Guo-qiang. Design of IRIG-B(AC) encoder based on FPGA. Journal of Measurement Science and Instrumentation, 2015, 6(3)： 291-295. ［doi： 10.3969／j.issn.1674-8042.2015.03.016］
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