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“罗兰”(LORAN)一词是远程导航(Long Range Navigation)英文字头的缩写,是第二次世界大战时开始发展的一种脉冲式双曲线定位系统。目前已有A、B、C、D四种类型。罗兰—B因周期识别困难已停止发展。罗兰—A系统,从1943年即开始装备,它工作在1.75～1.95MHz频段上,其地波可达700浬,天波达1400浬,主要用于海上航线,这种系统实际上只能算是中程导航系统。罗兰—C系统是一种低频脉冲相位双曲线远程导航系统,由罗兰—A发展而来。1952年开始试验它的前身西塔克(CYTA
The term “LORAN” is an acronym for the English prefix of Long Range Navigation, a pulsed hyperbolic positioning system that developed during the Second World War. There are four types of A, B, C and D. Roland-B stopped its development due to the difficulty of identifying cycles. Roland-A system, starting from 1943 that is equipped, it works in the 1.75 ~ 1.95MHz band, the ground wave up to 700 天, up to 1400 天 wave, mainly used for sea routes, this system can only be considered in fact Navigation system. Roland-C system is a low-frequency pulse hyperbola hyperbolic navigation system developed by Roland-A. Its predecessor, Testa (CYTA), began its experiment in 1952