Milestone-Proposal:LORAN: Difference between revisions
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Standard Loran is a hyperbolic system that was developed primarily for navigation over water. It operate on one of several frequencies between1700and 2000 kc/seeand thereforeenjoyspropaga- tion characteristics determined primarily by soil conductivity and ionospheric conditions. Transmitters now in use radiate about 100kw and give a ground-wave range oversea water of about 700 nautical miles in the daytime. The day timer ange over land is seldom more than 250 miles even for high-flying aircraft and is scarcely100miles at the surface of the earth. At nightthe ground-wave range oversea water is reduced to about 500 miles by the increase in atmospheric noise, but sky waves, which are almost completely absorbed by day,become effective and increase the reliable night range to about 1400miles. | Standard Loran is a hyperbolic system that was developed primarily for navigation over water. It operate on one of several frequencies between1700and 2000 kc/seeand thereforeenjoyspropaga- tion characteristics determined primarily by soil conductivity and ionospheric conditions. Transmitters now in use radiate about 100kw and give a ground-wave range oversea water of about 700 nautical miles in the daytime. The day timer ange over land is seldom more than 250 miles even for high-flying aircraft and is scarcely100miles at the surface of the earth. At nightthe ground-wave range oversea water is reduced to about 500 miles by the increase in atmospheric noise, but sky waves, which are almost completely absorbed by day,become effective and increase the reliable night range to about 1400miles. | ||
HISTORY - USE POINT TO USCG | HISTORY - USE POINT TO USCG | ||
The following paragraphs tell the story of Loran's beginning, its first leaders, location where the work was performed, the installation of the first | The following paragraphs tell the story of Loran's beginning, its first leaders, location where the work was performed, the installation of the first | ||
Engineering is not a solo activity. When a grande long-lived engineered system like LORAN, .. this nomination milestone gives credit to those persons that worked on the so-called Project 3 or C of the Radiation Laboratory of MIT during 1941 to c1946. This group of individuals did not work in the Rad Lab building, having nothing to do with microwave or radar. These individuals work in the Hood Building and other building in Boston and Cambridge. The USCG had a permanent office working on this project. One person in particular that deserves mention is Coast Guard Lt. Cmdr. L.M. Harding who provided supervision and direction for the Pacific Loran ... | Engineering is not a solo activity. When a grande long-lived engineered system like LORAN, .. this nomination milestone gives credit to those persons that worked on the so-called Project 3 or C of the Radiation Laboratory of MIT during 1941 to c1946. This group of individuals did not work in the Rad Lab building, having nothing to do with microwave or radar. These individuals work in the Hood Building and other building in Boston and Cambridge. The USCG had a permanent office working on this project. One person in particular that deserves mention is Coast Guard Lt. Cmdr. L.M. Harding who provided supervision and direction for the Pacific Loran ... | ||
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Refer to Pierce article | Refer to Pierce article | ||
INSERT IMAGE HERE showing the extent of coverage in 5 years of effort... 1946 | INSERT IMAGE HERE showing the extent of coverage in 5 years of effort... 1946 | ||
LORAN first signal began transmissions during the summer 1941. New LORAN transmitting stations were added around the Atlantic coast throughout WW2 and the continental United States. The LORAN-C system became obsolete, replaced by GPS navigation system and the LORAN system was terminated in a special ceremony orchestrated by USGC Washington headquarters in 8 February 2010.theHow the LORAN project was initiated, organized and managed is very interested, if not note worthy. | LORAN first signal began transmissions during the summer 1941. New LORAN transmitting stations were added around the Atlantic coast throughout WW2 and the continental United States. The LORAN-C system became obsolete, replaced by GPS navigation system and the LORAN system was terminated in a special ceremony orchestrated by USGC Washington headquarters in 8 February 2010.theHow the LORAN project was initiated, organized and managed is very interested, if not note worthy. | ||
Rapid construction under extreme weather conditions. System operation by operators from different nations: US, Canada and Denmark. Collaborative effort. MIT Lab was initially responsible for the entire program, but under close hands-on direction of the USCG. USGC's role increased. | Rapid construction under extreme weather conditions. System operation by operators from different nations: US, Canada and Denmark. Collaborative effort. MIT Lab was initially responsible for the entire program, but under close hands-on direction of the USCG. USGC's role increased. | ||
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LORAN-C was originally developed to provide radionavigation service for U.S. coastal waters & was later expanded to include complete coverage of the continental U.S. as well as most of Alaska. Twenty-four U.S. LORAN-C stations work in partnership with Canadian and Russian stations to provide coverage in Canadian waters and in the Bering Sea. They system provides better than 0.25 nautical mile absolute accuracy for suitably equipped users within the published areas. and provides navigation, location, and timing services for both civil and military air, land and marine users. It is approved as an en route supplemental air navigation system for both Instrument Flight Rule (IFR) and Visual Flight Rule (VFR) operations. The LORAN-C system serves the 48 continental states, their coastal areas, and parts of Alaska. Dedicated Coast Guard men and women have done an excellent job running and maintaining the LORAN-C signal for 52 years. It is a service and mission of which the entire Coast Guard can be proud. | LORAN-C was originally developed to provide radionavigation service for U.S. coastal waters & was later expanded to include complete coverage of the continental U.S. as well as most of Alaska. Twenty-four U.S. LORAN-C stations work in partnership with Canadian and Russian stations to provide coverage in Canadian waters and in the Bering Sea. They system provides better than 0.25 nautical mile absolute accuracy for suitably equipped users within the published areas. and provides navigation, location, and timing services for both civil and military air, land and marine users. It is approved as an en route supplemental air navigation system for both Instrument Flight Rule (IFR) and Visual Flight Rule (VFR) operations. The LORAN-C system serves the 48 continental states, their coastal areas, and parts of Alaska. Dedicated Coast Guard men and women have done an excellent job running and maintaining the LORAN-C signal for 52 years. It is a service and mission of which the entire Coast Guard can be proud. | ||
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Loran stations | |||
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http://www.scribd.com/doc/35814242/MIT-Radiation-Lab-Series-V2-Radar-Aids-to-Navigation | |||
THE COAST GUARD AT WAR | |||
IV LORAN VOLUME II | |||
Prepared in the Historical Section Public Information Division U.S. Coast Guard Headquarters Aug. 1, 1946 | |||
http://www.uscg.mil/History/STATIONS/loran_volume_2.pdf | |||
REFERENCES | REFERENCES | ||
JA Pierce, "An Introduction to Loran", IEEE AES Magazine 1990 (attached) | JA Pierce, "An Introduction to Loran", IEEE AES Magazine 1990 (attached) | ||
Bowditch, American Practical Navigator.U.S. Navy Hydrographic Office, 1958 pp. 333 - 343 | Bowditch, American Practical Navigator.U.S. Navy Hydrographic Office, 1958 pp. 333 - 343 | ||
Willoughy, Malcom Francis; The Story of LORAN in the U.S. Coast Guard in World War II, Arno Pro, 1980 | Willoughy, Malcom Francis; The Story of LORAN in the U.S. Coast Guard in World War II, Arno Pro, 1980 | ||
WEBSITES | WEBSITES | ||
THE COAST GUARD AT WAR. IV LORAN VOLUME II | |||
Prepared in the Historical Section Public Information Division U.S. Coast Guard Headquarters Aug. 1, 1946 | |||
http://www.uscg.mil/History/STATIONS/loran_volume_2.pdf | |||
http://www.loran-history.info/ | http://www.loran-history.info/ | ||
http://www.uscg.mil/history/stations/loran_volume_1_index.asp | http://www.uscg.mil/history/stations/loran_volume_1_index.asp | ||
Wikipedia, LORAN http://en.wikipedia.org/wiki/LORAN | Wikipedia, LORAN http://en.wikipedia.org/wiki/LORAN | ||
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http://www.uscg.mil/History/STATIONS/LORAN_Section_1.asp | http://www.uscg.mil/History/STATIONS/LORAN_Section_1.asp | ||
http://www.scribd.com/doc/35814242/MIT-Radiation-Lab-Series-V2-Radar-Aids-to-Navigation | http://www.scribd.com/doc/35814242/MIT-Radiation-Lab-Series-V2-Radar-Aids-to-Navigation | ||
TO PROBE FURTHER | TO PROBE FURTHER | ||
I. B.W. Sittelry, “ELEMENTS OFLORAN,” MIT Radiation Laboratoyr Re- port No. 499; March, 1944; also available as Navships 900, 027, Bureau of Ships, April 1944 | I. B.W. Sittelry, “ELEMENTS OFLORAN,” MIT Radiation Laboratoyr Re- port No. 499; March, 1944; also available as Navships 900, 027, Bureau of Ships, April 1944 | ||
Revision as of 22:56, 9 December 2010
This Proposal has not been submitted and may only be edited by the original author.
Pierce Loran.pdf
