LORAN - Wikipedia
LORAN, in its original form, was an expensive system to implement, requiring a cathode ray tube (CRT) display. This limited use to the military and large commercial users. Automated receivers became available in the 1950s, but the same improved electronics also opened the possibility of new systems with higher accuracy.
Loran-C - Wikipedia
Loran-C is a hyperbolic radio navigation system that allows a receiver to determine its position by listening to low frequency radio signals that are transmitted by fixed land-based radio beacons. Loran-C combined two different techniques to provide a signal that was both long-range and highly accurate, features that had been incompatible.
2021年10月26日 · the Loran-C Radionavigation System and to present an introduction to its use. This revision reflects major changes in: the Loran-C system, Coast Guard operational technology, and Loran...
罗兰（导航及定位系统）_百度百科
罗兰 导航系统 long range navigation （在导航领域通常简称“罗兰”，即英文的Loran）是一种导航及定位系统，又称“劳兰”。 LORAN是远程 导航 的缩写，是在 二战 期间在美国开发的双曲线 无线电导航系统。 它类似于英国的 Gee 系统，但是在较低频率下运行，以便提供高达1500英里（2,400公里）的距离， 准确度 为几十英里。 它首先用于穿过大西洋的舰队，然后用于远程巡逻机，但主要用于太平洋战区的船舶和飞机。 原来LORAN是一种昂贵的系统，需要一个 阴极射线 …
Navigating waters before GPS: Why some mariners still refer to Loran-C
2018年4月17日 · Alternatively, some electronic chart systems allow you to display Loran-C lattices over current up-to-date charts, or to import a chart image, define its Lat/Lon origin, and utilize it with chart plotter software.
The prototype system is called a Loran-C Display System (LDS). It is designed to receive position reports from a number of cooperating vessels equipped with LDS Telemetry Units and show the positions of the vessels on a geographic map displayed on a CRT. The display incor-porates a number of operator support features that are useful to a VTS
The AN/ASN.24 computer processes the Loran-C data for direct presentation as (1) latitude-longitude, (2) range-bearing, or (3) along-course/off-course information. The encoder system is fitted entirely within the Receiver.lndicator chassis.
Long range navigation (Loran) and global positioning system (GPS) receivers are widely used in aviation. The Loran and GPS receivers are similar in size and function but derive their navigation signals from different sources. The design of the controls, displays, and computer logic is usually similar for the two types of receivers from a single
- [PDF]
CHAPTER 6
Although in some parts of the world LORAN-C is no longer supported, a new version called eLORAN (enhanced LORAN) is starting to be implemented in other parts due to the need for a precise positional system as backup to GPS. This updated version increases the accuracy by precise time scales independent of satellite systems.
sages from the internal Loran-C receiver. Current route number, range mnemonic (i.e., section of riv er), and heading angle to steer can also be called to the display. To compensate for seasonal variations, PLAD has a built-in autocalibration feature to mea sure small variations in the Loran-C coordinates at cal
- 某些结果已被删除