The stability and space correlation about the sky-wave propagation time-delay in Loran-C system are studied.

研究了罗兰-C天波传播时延的稳定性与空间相关性。

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However, to do the same to the Loran system, you'd need a 40ft tower -- and around 25kW of juice to power it.

ENGADGET

Just one year ago, the Bush administration announced it would keep the ground-based LORAN system operational to serve as a backup for the satellite-based global positioning systems, which are becoming ubiquitous in cars, planes and ships.

CNN: Navigation system, aid to farmers among budget cuts

It's always nice to see an old tech stage a comeback and this time it's happening around the coasts of Europe, with nine low-frequency radio transmitters substituting for GPS' satellite-based system. eLoran's radiowave-based system is stronger than satellite signals and less jammable, based on the Loran system that was previously used for shipping navigation by both the British and US navy over 50 years ago.

ENGADGET