IEEE
You are not logged in, please sign in to edit > Log in / create account  

Milestone-Proposal:LORAN

From GHN

(Difference between revisions)
Jump to: navigation, search
(Article updated via HTTP request)
(Article updated via HTTP request)
Line 1: Line 1:
{{ProposalEdit|a1=LORAN|a2a=Cambridge MA|a2b=Boston Section|a3=1940 to 1946|a4=What is loran? Loran is a hyperbolic system of navigation by which difference in distance from two points on shore is determined by measurement of the time interval  between reception of pulse- modulated synchronized signals from transmitters at the two points. The name loran is derived from long-range navigation. Both ground waves and sky waves can be used to provide coverage over an extensive area with few stations, depending on design frequencies.  An important advantage of loran at the time of its development during  WW2, was that a ship could  use loran without breaking radio silence. Loran transmitting stations work in pairs. Synchronization is achieved by letting the signals of the master station, control those of the slave station. To help overcome the disadvantage of requiring two transmitting stations for a single family of hyperbolic  lines of positions, loran  forms a chain of stations, so that each station except the end ones operate with the station on either side to form an intersecting lattice of position lines. Loran can be used for air-borne  navigation as well as by mariners.  To find their way, loran navigators must have an radio receiver-indicator, a time piece, and  a set of loran nautical charts or loran tables.  
+
{{ProposalEdit|a1=LORAN|a2a=Cambridge MA|a2b=Boston Section|a3=1940 to 1946|a4=What is loran? Loran is a hyperbolic system of navigation by which difference in distance from two points on shore is determined by measurement of the time interval  between reception of pulse- modulated synchronized signals from transmitters at the two points. The name loran is derived from long-range navigation. Both ground waves and sky waves can be used to provide coverage over an extensive area with few stations, depending on design frequencies.  An important advantage of loran at the time of its development during  WW2, was that a ship could  use loran without breaking radio silence. Loran transmitting stations work in pairs. Synchronization is achieved by letting the signals of the master station, control those of the slave station. To help overcome the disadvantage of requiring two transmitting stations for a single family of hyperbolic  lines of positions, loran  forms a chain of stations, so that each station except the end ones operate with the station on either side to form an intersecting lattice of position lines. To find their way, loran navigators must have an radio receiver-indicator, a time piece, and  a set of loran nautical charts or loran tables. Loran is also used for air-borne  navigation.
  
Loran was used
+
Description
Loran consist of three components: 1.  a chain of radio transmitters in operations 24/7 to create an electronic lattice or grid upon the surface of the earth.  2. a loran receiver-indicator in each ship or aircraft and  3. loran nautical and aeronautical charts or tables published by the US Navy Hydrographic Office. A simple explanation of how loran works can be found is section on loran as an Attachment named "American Practical Navigator"
+
Loran consist of three components: 1.  a chain of radio transmitters creating an electronic lattice or grid upon the surface of the earth.  2. a loran receiver-indicator, something like  an electronic timer with a cathode ray tube and  3. loran nautical and aeronautical charts or tables published, for example,  by the US Navy Hydrographic Office.  
INSERT OR REFER TO DOC..
+
 
 +
A simple explanation of how a navigator used loran in the 1940s to determine his position or fix  follows next: first the  line of position was established by measuring the relative time of arrival of two pulses which were known to have left two separate transmitters at times differing by a known interval. The time difference was noted in microseconds. With this information, charts and compasses, the navigator could plot a series of points on a chart plotting a line of position. No fix point yet. The navigator needs additional information to find the fix position. He may use a second pair of oran stations to determine a new line of position.  Crossing of these two lines of position is the loran fix.  For those wanting more details on the loran hyperbolic system of navigation,  see Chapter X111 of  Bowditch's American Practical Navigator.
  
 
Each ship or bomber required a radio receiver- indicator, something like a electronic stopwatch but with a cathode ray tube, timing circuits, etc. The third system component was Loran charts or tables wasThen the navigator
 
 
shipboard navigators
 
shipboard navigators
 
BRIEF DESCRIPTION
 
BRIEF DESCRIPTION

Revision as of 18:58, 10 December 2010

This Proposal has not been submitted and may only be edited by the original author.
Pierce Loran.pdf
Loran1.jpg .png
Loran_chart.png


This is a test