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Topic: Decca Navigator System

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	Maretron
		The system is an arrangement of fixed, phase locked, continuous wave transmitters operating on harmonically related frequencies and special receiving equipment located on a vessel.
		The operation of the system depends of phase comparison of the signals from the transmitters brought to a common comparison frequency with the receiver.
		The NAVSAT system utilizes the Doppler shift of radio signals transmitted from the satellite to measure the relative velocity between the satellite and the navigator.
	www.maretron.com /support/glossary.php (6166 words)

	Arctic Corsair - Decca Navigation System (Site not responding. Last check: )
		The Decca Navigation system was a sophisticated and extremely accurate radio position-fixing system for marine, air and land use based upon continuous wave signals in the low frequency band of 70 - 130 kHz.
		Once the Decca Navigator had been switched on and setup, usually on leaving port, it will run continuously for the duration of the trip and the skipper need only to refer to the decometers of the two lanes he is using.
		This was a vast improvement on the previous system although, depending on atmospherics and weather conditions, accuracy was somewhere in the region of 100 yards.
	www.arcticcorsair.f9.co.uk /corsair/in-depth/deccanavigator.htm (1953 words)

	Decca Navigation System (Site not responding. Last check: )
		The Decca Navigator System was an early precursor to positioning like the American GPS system and the planned European Galileo positioning system.
		The system was deployed extensively in the Sea and was used by helicopters operating oil platforms.
		Decca Navigator headquartered in a large residential at Little Wymondley Hertfordshire had several chains through the UK and signal locking between systems was possible.
	www.freeglossary.com /Decca_Navigation_System (1447 words)

	Decca Navigator System - Wikipedia, the free encyclopedia
		The Decca Navigator System was a hyperbolic low frequency radio navigation system (also known as multilateration) that was first deployed during World War II when the Allied forces needed a system which could be used to achieve accurate landings.
		The system was deployed extensively in the North Sea and was used by helicopters operating to oil platforms.
		A three-station trial was held in conjunction with a large-scale assault and landing exercise in the Moray Firth in February/March 1944.
	en.wikipedia.org /wiki/Decca_Navigator_System (2068 words)

	[10.0] Radio Navigation Systems (Site not responding. Last check: )
		The Japanese system was relatively crude, requiring the navigator to perform timing with a stopwatch as part of the procedure to determine the position of his aircraft or vessel.
		Decca Navigator also provided another set of signals for lane identification; details of these signals are unclear, and apparently there were variations in them as the system evolved over time.
		Decca was developed with British Admiralty funding but kept in reserve during the war, only being used in support of the Normandy invasion to provide accurate guidance for minesweepers.
	www.vectorsite.net /ttwiza.html (5786 words)

	The world's top GPS - Global Positioning System websites
		Traditional navigation systems were based on observation of the relative position of the Sun, Moon and stars.
		Navigators could determine their latitude by measuring the sun's angle over the southern horizon (if the ship was north of the sun's declination) at noon, and comparing that to the known angle at the same date at their home port.
		Automated navigation systems are almost all based on measuring the time-of-flight of radio waves using the well-known speed of light to measure distance from a number of points.
	www.websbiggest.com /dir-wiki.cfm/Top/Shopping/Consumer_Electronics/GPS_-_Global_Positioning_System (2406 words)

	Hyperbolic Navigation System
		Decca Navigator System - The Decca Navigator System was a hyperbolic radio navigation system (also known as multilateration) and first deployed during World War 2 when the Allied forces needed a system which could be used to achieve accurate landings.
		Automotive navigation system - An automotive navigation system is a satellite navigation system designed for use in automobiles.
		Beidou navigation system - The Beidou navigation system is a project by the People's Republic of China to develop an independent satellite navigation system.
	gps.vvvvvv3.com /hyperbolicnavigationsystem.html (595 words)

	ION Awards
		For a career he devoted to the development and evaluation of successful techniques in air navigation; and to the conception, development and testing of navigation equipment, and his experience as a practical air navigator of the highest caliber.
		For the development of radio navigation systems including the Decca Navigator System, his contributions to Loran C and Omega, and his recognition as a leading authority on the use of phase comparison techniques for navigation.
		For his lifetime contributions to navigation, first as a practical navigator, then as a teacher and finally as a supervisor; during which time he was instrumental in the commercial evaluation of jet stream, Doppler, and inertial navigation.
	www.ion.org /awards/fellows2000_post.cfm (313 words)

	Gps Navigator System (Site not responding. Last check: )
		The Global Positioning System and Inertial Navigation is the first-ever reference to provide engineers and scientists with a detailed, top-to-bottom look at GPS and INS in a single volume.
		Decca Navigator System - The Decca Navigator System was a hyperbolic radio navigation system (using an approach similar to multilateration) and first deployed during World War 2 when the Allied forces needed a system which could be used to achieve accurate landings.
		The cost of maintaining the system is approximately US$400 million per year, including the orbital elements of their own motion, as determined by a set of ground-based observatories.
	gp18.motorists-mico.com /gpsnavigatorsystem.html (1388 words)

	Mizen Head Visitor Centre Ireland Visitor Attractions
		Radio navigation is defined as navigation using radio waves for determination of position or a line of position.
		The system is similar to GPS and may be used for general navigation by aircraft and ships, etc. The accuracy is 100m-horizontal, 150m vertical and 15cm/s velocity (all 95% probability).
		The Decca Navigator System, generally known as Decca, is a hyperbolic radio navigation system currently available in UK, Ireland and Baltic area of Europe.
	www.mizenhead.net /navigation.html (1242 words)

	System Approach
		System dynamics - System Dynamics is one approach to modeling the dynamics of complex systems such as population, ecological and economic systems, which usually interact strongly with each other.
		Data-base management systems, model-base management systems, system approach and dialog generation system approach and management systems are clearly described, with emphasis on how these make a decision support system feasible system approach and practical.
		This work established the now accepted distinction between hard systems thinking, in which parts of the world are taken to be systems which can be engineered, system approach and soft systems thinking in which the focus is on making sure the process of inquiry into real-world complexity is itself a system for learning.
	www.onenet-ici.com /systemapproach.html (994 words)

	Decca navigation system
		This system, which was primarily developed as a long distance marine navigational aid, is basically a 'range difference' system, but as c.w.
		For very long range navigation such as is involved in crossing the North Atlantic the Decca Navigator Company have proposed a system to which they have given the name Dectra.
		The method of establishing the hyperbolae, and of measuring phase differences in the air, differs from the normal Decca system in that the master and slave stations do not transmit simultaneously but alternately.
	www.radarpages.co.uk /mob/navaids/decca/decca1.htm (1097 words)

	EUR-Lex - Recherche simple
		The system is needed when these vessels navigate offshore, or the position of fishing grounds has to be repeated, or the vessel's track relative to the movement of the fish has to be established.
		According to Racal Decca this was because this receiver type was not accepted in the market for commercial receivers and therefore could not fill the gap between the MK 21 and MK 30 receivers and the new MK 53 in course of development.
		The fact alleged by Racal Decca that British government officials did not consider encoding a desirable solution is not sufficient, in the absence of further evidence, to prove that this opinion (a) was definitive, (b) was binding and (c) could not be overcome, for example, by proposing variations of the basic solution.
	eur-lex.europa.eu /LexUriServ/LexUriServ.do?uri=CELEX:31989D0113:EN:NOT (12886 words)

	Decca Navigator - System Overview
		A Decca chain normally consisted of a master station controlling the phase of three slaves, which were situated about 120 degrees apart, at a radius of 60 to 100 miles from the master.
		As the pattern is traversed by the Decca receiving equipment so the reading will be observed to alter steadily from 0 degrees to 360 degrees between the limits of each lane; the decometer, from which this reading is obtained, is therefore graduated in fractions of a lane instead of in degrees.
		The ambiguity of the Decca Navigator system has been resolved in the Mark V (or QM5) receiver by the addition of a fourth dial called a "Lane Identification Meter".
	www.jproc.ca /hyperbolic/decca_oview.html (2683 words)

	Sperry Marine: Corporate History
		The Decca marine group is a direct descendent of the famous Decca Company, which was first established before the First World War, manufacturing gramophones and subsequently gramophone records under the Decca label.
		The Decca Navigator System was introduced to commercial markets in 1946 and became a mainstay of electronic navigation throughout Europe and other regions for more than four decades.
		Decca is also a leader in marine machinery monitoring and alarm systems and is one of the leading suppliers of specialized electronics for the commercial fishing industry.
	www.sperrymarine.northropgrumman.com /Company-Information/Corporate-History (738 words)

	Reference.com/Encyclopedia/Decca
		Decca Radar (later Racal-Decca Marine), a British marine electronics manufacturer, a spin-off from the gramophone and records company
		Decca Navigator System, a hyperbolic low-frequency radio marine and aeronautical navigation system
		Decca : the letters of Jessica Mitford, the collection of her correspondence edited by Peter Y. Sussman and published by Alfred A. Knopf in 2006.
	www.reference.com /browse/wiki/Decca (147 words)

	Marine radio navigation receivers: a report on the supply in the United Kingdom of marine radio navigation receivers ...
		The Commission was called upon to investigate whether or not a monopoly situation exists in relation to the supply in the UK of marine radio navigation receivers which are compatible with the Decca Navigator Systems (DNS).
		The Commission concludes in chapter 6 that: "Under section 6(1)(b) of the Fair Trading Act 1973 a monopoly situation shall be taken to exist where at least one-quarter of the supply of the relevant goods in the United Kingdom is supplied by members of one and the same group of interconnected bodies corporate.
		Evidence was sought from UK suppliers of marine radio navigation receivers which used DNS signal transmissions, and, from professional organisations and institutions and associations representing the merchant marine, commercial fishermen and pleasure boat users.
	www.bopcris.ac.uk /bopall/ref21586.html (315 words)

	Gps Navigator System
		Global Positioning System - The Global Positioning System, usually called GPS, is the only fully-functional satellite navigation system.
		Joint Precision Approach and Landing System - The Joint Precision Approach and Landing System (JPALS) is a military, all-weather landing system based on real-time differential correction of the GPS signal, augmented with a local area correction message, and transmitted to the user via secure means.
		Global Positioning and Navigation Systems Division - Global Positioning and Navigation Systems Division The Global Positioning and Navigation Systems Division's unique, state-of-the-art GPS test facilities are used to provide cradle-to-grave navigation system support, including verification of commercial and government GPS receivers for...
	gps.vvvvvv3.com /gpsnavigatorsystem.html (694 words)

	Jacinta In Depth - LORAN (Site not responding. Last check: )
		In the early 1970s the system was placed under civil control with stations staffed by the United States Coast Guard worldwide.
		This system was often used as a semi portable one for local surveys, particularly in oil exploration.
		British hyperbolic systems were deployed and one, the Decca Navigation System, was often deployed by private firms in a portable form for such operations as oil exploration.
	www.arcticcorsair.f9.co.uk /jacinta/in-depth/loran.htm (1100 words)

	The Orcadian Features - Signalling the end for Decca
		For over 40 years, the Decca station has transmitted a series of tones and pulses which helped fishing vessels, other shipping and aircraft to pinpoint their exact location.
		The Decca station in Dounby started transmitting from a group of wooden huts, in the same field now occupied by the three large masts, on September 1, 1955.
		The whole system became totally automated in January, 1994, and the individual stations were left unattended except for maintenance work carried out by a locally-based engineer.
	www.orcadian.co.uk /features/articles/decca.htm (1960 words)

	Automatic microprocessor-based receivers for the Decca Navigator system, The Radio and Electronic Engineer 54(7/8) ...
		The Mark 5 receiver uses the "orange" channel of the Decca Navigator transmissions, and is based on a design published by J.D. Last; but unlike Last's design, it computes a position fix by directly measuring the phase of the signal, using phase-locked-loop techniques, with software correction for interrupt latency.
		The system comprises a whip antenna and antenna coupler, a radiofrequency (RF) stage which converts the RF signal to baseband, a quadrature directdigital-synthesis local oscillator, and separate one-bit I and Q digital sampling channels.
		The system is versatile: the hardware can receive and process both Loran-C and Decca Navigator signals, and LF time signals and LF domestic broadcast signals can be received and used for frequency calibration.
	citeseerx.ist.psu.edu /showciting?cid=3054013 (604 words)

	Gps Navigator System (Site not responding. Last check: )
		Although GPS receivers are widely used in everyday life to aid in positioning and navigation, this is the only text that is devoted to complete coverage of their operation principles.
		Designed with the novice or rusty celestial navigator in mind, it even includes a celestial navigation primer.
		Technical description The system consists of a "constellation" of at least four satellites in 6 two wirelessly and receiver a reality, including then to (the satellite, vari...
	fl63.motorists-mico.com /gpsnavigatorsystem.html (1295 words)

	Portable Gps Navigation System (Site not responding. Last check: )
		The Decca Navigator System was an early precursor to positioning systems like the American GPS system and the planned European Galileo positioning system.
		The Decca Navigator system was deployed extensively in the United Kingdom after World War 2 when the Allied forces needed a system which could be used to joke that DECCA was an acronym for Dedicated Englishmen Causing Chaos Abroad.
		Decca Navigation System The Decca Navigator system was a hyperbolic radio navigation system and first deployed during World War 2 when the Allied forces needed a system which could be used to achieve accurate landings.
	gp20.mateus-inc.com /portablegpsnavigationsystem.html (686 words)

	TIME.com: Automatic Navigator -- May 4, 1953 -- Page 1
		The Decca system uses "master" and "slave stations", which set up a wide-spreading pattern of intersecting waves (see diagram).
		During the demonstration in Germany, the Decca Navigator made a strong impression on U.S. pilots who fly the Berlin Corridor, where trigger-happy Russians are apt to fire on straying airplanes.
		Rivals of Decca point out that it uses long-wave radio waves and is therefore apt to be bothered by static.
	www.time.com /time/magazine/article/0,9171,818407,00.html (571 words)

	Decca Navigator Introduction Page
		As the Decca Marine and Aircraft Receivers were only available on a rental basis, the changes in transmission formats did not cause problems to the end users – the company simply upgraded the receivers free of charge as part of the rental contract.
		The Decca chapter is particularly well written and is an excellent source for a technical description of the operation of the Decca System.
		Hi-Fix, as can be ascertained from the name was a high accuracy surveying tool and not intended for general navigation, and although permanent chains did exist, one being for navigation on the lower reaches of the River Thames, most were temporary and set up for a particular surveying exercise.
	www.g4ftc.co.uk /decca/home.htm (1558 words)

	Who Is 'uncletony' ?
		Their radio/TV HF twisted pair distribution system was the forerunner of Cable-TV as we know it today.
		The Decca Navigator system was first used in June 1944, and in the following decades became the worldwide, most reliable marine navigation system.
		From then onwards the Decca Navigator Service was funded by the General Lighthouse Authority (GLA) and Racal continued to operate it on the Authority’s behalf.
	web.onetel.com /~uncletony/who-is.htm (854 words)

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