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。
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