Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.
利用AT 89s51单片机及实时时钟集成电路ds1643，设计了一个电子钟系统，实现了日期、时间显示及报时功能。
New integrated Marine navigation system, the Marine celestial navigation system based on the Electronic Chart Display and Information system (ECDIS), is presented and established in this paper.
本文提出并建立了一种新的舰船组合导航系统，即基于ECDIS(电子海图)系统的舰船天文导航系统。
New integrated Marine navigation system, the Marine celestial navigation system based on the Electronic Chart Display and Information system (ECDIS), is presented and established in this paper.
本文提出并建立了一种新的舰船组合导航系统，即基于ECDIS(电子海图)系统的舰船天文导航系统。
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