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Topic: Gyrocompass

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	Gyrocompass - Patent 4379365
		Gyrocompass as defined in claim 1, 2 or 3 wherein said verticality device comprises an electrically actuatable electromagnet which is disposed at the lower end of said body being pendulous body and having an armature and said housing has a calotte-shaped part with which said armature is in contact temporary.
		Gyrocompass as defined in claim 7 wherein said determining means comprise a data processor connected to receive signals representative of said angular velocity and of the angular position of said body about the axis of rotation, and to provide an indication of the north direction from such signals.
		Gyrocompass as defined in claim 24 wherein said second fine measurement is made over a preselected period of time and is obtained by deriving a number of individual measured values at regular intervals and deriving the associated angular velocity value by filtering and/or average formation of the individual measured values.
	www.freepatentsonline.com /4379365.html (5307 words)

	Rope Systems: Product Feature
		A GYROCOMPASS is essentially a gyroscope which seek and continuously align itself with the meridian and point to true north.
		Basically, the gyrocompass depends upon the properties of a gyroscope- the gyroscopic inertia (or rigidity in space) and precession to seek the true north direction using the earth’s rotation and the earth’s gravitation as reference.
		The advantages of using a gyrocompass compared to a magnetic compass is that it detects and points to the true north after three to four hours of running.
	www.ropesystems.com /feature.htm (1386 words)

	Talk:Gyrocompass - Wikipedia, the free encyclopedia
		I have done a fair bit of work at university on the gyrocompass, and I think that to cite friction as the "crucial ingredient" is misleading.
		In its simplest and most effective form, a gyrocompass is a gyroscope in which the gimbals (or mountings) are modified to force the rotor axis to remain horizontal relative to the earth's surface.
		The components of rotation caused by the spin of the earth mean that the rotor must align itself with the true meridian in order to obey the law of conservation of angular momentum.
	en.wikipedia.org /wiki/Talk:Gyrocompass (282 words)

	Quick settling gyrocompass having interaxis decoupling compensation for improved response time - Patent 3938256
		A common type of gyrocompass operates by sensing the rotation of the earth and aligning a gyro spin axis so that the component of the earth's rotation sensed by the gyro about an input axis is zero.
		In practicing the invention, a quick settling, accurate gyrocompass is provided which includes a packaged gyroscope having two input axes about which motion takes place in aligning the spin (third orthogonal axis) of the gyroscope with the spin axis of the earth to establish an azimuth reference.
		The gyrocompass employs a two degree of freedom (two axis) gyroscope connected in a North seeking configuration and a novel decoupling compensation circuit interconnected between the respective outputs of the two axes for eliminating inherent cross coupling between the two axes and thereby improves the settling times of the gyrocompass without adversely affecting its accuracy.
	www.freepatentsonline.com /3938256.html (6875 words)

	TSB Reports - Marine 1995 - M95L0189
		On 25 November 1995, the Greek bulk carrier "JEANNIE", with a cargo of 25,754 tonnes of titanium from Richards Bay, South Africa, was bound for the Port of Contrecoeur, Quebec.
		Several factors affected the conduct of the vessel, including the disruption of the gyrocompass which induced a variable gyroscopic error; the relative-motion radar display which rendered the radar less useful; the absence of buoys S140 and S141; and the reduced visibility which hampered navigation of the vessel by visual observation.
		The pilot was unsure as to the gyroscopic error that the gyrocompass might be exhibiting on the Île du Moine course.
	www.bst.gc.ca /en/reports/marine/1995/m95L0189/m95L0189.asp?print_view=1 (1882 words)

	Portable surveying compass with flux valve and gyrocompass alignment modes - Patent 4109391
		Within the follow-up container portion 104 and the downward extension 112 thereof is contained a gyrocompass assembly floated in a suitable gyroscope floatation fluid filling the interior of follow-up container portions 104, 112 to the level indicated at 108c.
		The sensitive floated gyrocompass assembly is neutrally buoyed in the hermetically sealed floated shell consisting principally of the conical top part 107, the thin-walled cylindric shell 108, and the hemispherical shell 115 which each may be constructed of a light-weight material such as a glass-reenforced epoxy molded plastic.
		The pendulosity of the sensitive floated gyrocompass assembly is adjusted to a normal value by locating gyroscope rotor 110, in which is located the largest mass of the assembly, below the center of buoyancy of the fluid.
	www.freepatentsonline.com /4109391.html (9089 words)

	MSN Encarta - Compass
		The gyrocompass, which is unaffected by the magnetism of the earth, consists of a gyroscope, with the spinning wheel on an axis confined to the horizontal plane so that its axle aligns itself with the north-south line parallel to the axis of the rotation of the earth, thereby indicating true north.
		Unaffected by magnetism and pointing to true north, the gyrocompass is not subject to the inherent errors of deviation and variation of the magnetic compass.
		In most oceangoing vessels the gyrocompass is connected electrically to a gyropilot, a device that automatically steers the ship, keeping it on course in accordance with signals from the gyrocompass.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761558614 (820 words)

	Encyclopedia: Gyrocompass (Site not responding. Last check: 2007-10-07)
		Schuler tuning Schuler tuning describes the fundamental functional conditions for a gyrocompass.
		GKU-2 - the modified model of the gyro heading indicator for the Navy which features high accuracy and reliability in gyrocompass and gyroazimuth modes of operation.
		The crucial additional ingredient needed for a gyrocompass is friction : the gyroscope is in fact not completely free to reorient itself; if for instance a device connected to the axis is immersed in a viscous fluid, then that fluid will resist reorientation of the axis.
	www.nationmaster.com /encyclopedia/gyrocompass (1135 words)

	Gyrocompass navigation system for land vehicles - Patent 4693114
		This features two-step gyrocompassing via a two position "fine" arrangement which effectively takes a single rate average in two distinct positions for updating vehicle heading which is immune to gyro bias magnitude.
		During a north align (gyrocompassing) mode, gyro 5 is operated as a strapped-down platform rate sensor with its input axis moved through a specific attitude in a plane defined by the longitudinal and lateral axes of the vehicle.
		After gyrocompassing, the input axis of the gyro is rotated 90 degrees while azimuth gimbal 2 is caged by a position servo (not otherwise shown).
	www.freepatentsonline.com /4693114.html (3683 words)

	ZORA CO., LTD : MARINE RADIO & NAVIGATION SYSTEMS
		TKM is designed for translation of the heading data from the gyrocompass to analogue and digital receivers as well as for generation of 24V DC voltage from the ship's mains 220V AC, 50Hz.
		The Meridian Gyrocompass can be installed as a stand-alone unit, or together with S G Brown's comprehensive range of repeaters and ancillaries it becomes a single or dual gyro system within a fully integrated bridge system.
		Gyrocompass Meridian Surveyor complies with the requirements of IMO A 424(XI), IMO A 821 (1bv9), BS EN 60945, BS EN ISO 8728.1994, BS 6217.
	www.zora.ru /eng?a=show&id=48 (1194 words)

	Gyrocompass - Wikipedia, the free encyclopedia
		In 1889, Captain Arthur Krebs designed an electric pendular gyroscope (without north seek) for the experimental French submarine Gymnote.
		In 1908, Anschütz-Kaempfe and the American inventor Elmer Ambrose Sperry patented the gyrocompass in Britain and the US.
		When Sperry attempted to sell this device to the German navy in 1914, Anschütz-Kaempfe sued for patent infringement.
	www.wikipedia.org /wiki/Gyrocompass (586 words)

	Howstuffworks "How Compasses Work"
		In a gyrocompass, this tendency is used to emulate a magnetic compass.
		At the start of the trip, the axis of the gyrocompass is pointed toward north using a magnetic compass as a reference.
		A motor inside the gyrocompass keeps the gyroscope spinning, so the gyrocompass will continue pointing toward north and will adjust itself swiftly and accurately even if the boat is in rough seas or the plane hits turbulence.
	science.howstuffworks.com /compass3.htm (182 words)

	Sensor integration for Personal Positioning System
		At first, we measured the motion of pelvis when user walks 6 meters in 10 steps by the gyrocompass which is fixed to the lower back of a user.
		The time- series data measured by the gyrocompass in a stationary state is illustrated in Figure 7.
		We are now developing some mechanism to set up different parameters for each users; the parameters are estimated by the time-series data measured by the sensors when user walks several times in the same distance, or the parameters are automatically improved while user using the positioning system.
	www.gisdevelopment.net /aars/acrs/2000/ps1/ps117pf.htm (1894 words)

	Austin Navigation Systems
		With an eye on the fast approaching shipboard navigation and control system technologies of the 21st century, a new generation of advanced marine gyrocompasses has been created: the SR-180 MK 1.
		The first of its type to be designed as a single unit and of unparalleled compactness in a polyurethane hard foam housing is of low weight and allows this gyrocompass to be installed on any bridge, from large yachts to the most capacious merchant marine vessels.
		For example, after a three minute gyrocompass power failure, no more that two degrees of deviation may be expected.
	www.austin-insulators.com /radar/112.html (478 words)

	USS Pampanito - Gyrocompass Documentation/Restoration Project
		The gyrocompass is used to interpret navigation technology, basic principles of physics, basic principles of navigation and fire control during educational programs.
		The practical gyrocompass was invented by the creative genius Elmer Sperry ca 1904.
		A gyrocompass measures the movement of a ship around small wheels turning at high speed to track the movement of a ship.
	www.maritime.org /gyro.htm (2552 words)

	Trident Offshore Ltd - Marine Consultants and Contractors
		The Roberston's SKR, the world's first electronic gyrocompass for marine use - and still a leader in its field has many detailed improvements, reflected in the SKR 82.
		Until the introduction of SKR 82 the marine application of some gyro techniques was considered unachievable using conventional technology.
		The gyrocompass has been approved by Det Norske Veritas, D.O.T. (Department of Trade UK.) B.S.H. (Bundesamt fur Seeschiffart und Hydrographic, Germany, formerly D.H.I.), the Norwegian Maritime Directorate and conforms with the l.M.O. resolution A.424 (XI).
	www.trident-offshore.com /head_gyrocompass.html (148 words)

	Gyrocompass (Site not responding. Last check: 2007-10-07)
		Gyrocompass "Geus" is designed to fit to a wide variety of sea and river ships, from small workboats to fast ferries and cruise liners.
		Gyrocompass complies with requirements of IMO A.424(XI), A.82K19), MEC 945-95, ISO 8728-1987.
		Gyrocompass with correction based on dynamically tuned gyroscope is placed into a cylindrical casing with the heading scale at the top.
	www.ami-gfv.com /gyrocompass1.htm (244 words)

	Drake Passage & Southern Ocean
		The Ashtech ADU-2 GPS is used to correct errors in the heading of the ship's gyrocompass prior to input of the data into the ADCP processing stream.
		This is necessary as the gyrocompass can oscillate for several minutes after a manoeuvre due to an inherent error.
		Four UNIX scripts were used to process the Ashtech data in order to be able to correct the gyrocompass error as required.
	www.soc.soton.ac.uk /JRD/HYDRO/drake/j67_3.php (2421 words)

	Untitled Document (Site not responding. Last check: 2007-10-07)
		Two of the main sources of operational errors in a gyrocompass are the vessel's speed (actually velocity) and the local Latitude.
		One of the added bonuses of using a gyrocompass is that the heading information can be transmitted around the ship, to other instruments such as steering or bearing repeaters, radar, electronic charts and the autopilot.
		Lately, we are beginning to see the introduction of non-mechanical gyrocompasses based on such devices as the laser or ring gyro, the FOG or fibre optic gyro and the acoustic gyro.
	www.sas.org /E-Bulletin/2002-05-17/feedback/body.html (309 words)

	Anomalous Observation - Physics Help and Math Help - Physics Forums
		The only thing I don't like is the fact that a gyrocompass does suggest that the earth rotates in another reference frame that apparently does not rotate with the earth.
		You say that 'a gyrocompass does suggest that the earth rotates in another reference frame that apparently does not rotate with the earth.
		A gyrocompass will align its poles with the poles of the earth due to the earth's rotation.
	www.physicsforums.com /showthread.php?p=103066&mode=threaded (1244 words)

	Arctic Corsair - Inside The Gyrocompass (Site not responding. Last check: 2007-10-07)
		The gyrocompass provides a true north heading regardless of the ships position and relative position to anomalies that can cause deviations to a magnetic compass.
		The main gyrocompass is located in one of the strongest parts of the vessel, the winch motor room.
		From there the Gyrocompass has a number of Repeaters on the bridge that show the position.
	www.arcticcorsair.f9.co.uk /corsair/in-depth/gyrocompassinsides.htm (74 words)

	VT TSS Press Release March 2004: NEW MERIDIAN SUBSEA GYROCOMPASS FROM VT TSS
		The new gyro is depth rated to 3,000 metres and is available in a standard version and as the Meridian Subsea RP that includes a roll and pitch module.
		Unlike conventional spinning mass gyrocompasses, the new Meridian Subsea uses a dry element that eliminates the need for routine maintenance and significantly reduces ownership costs.
		With the largest global support network of any gyro manufacturer, VT TSS Ltd is able to provide a complete repair, test and calibration service in what the company considers to be the unlikely event that it will be needed.
	www.vttss.com /news_mersubmarch2004.shtml (495 words)

	Litton Marine Systems
		In the early and mid 1900's C.Plath advanced into gyrocompasses and has been making constant technological advances ever since, bringing to days market a series of gyrocompasses, fiber-optic gyrocompasses, autopilots, adaptive autopilots, compass monitor systems, universal digital repeaters, electric main steering systems, speed logs and marine accessories.
		The SR 2100 is the first solid-state, fully electronic digital gyrocompass system for marine application in strap down technology.
		The ring laser inertial gyrocompass systems are the standard for many international Navy frigates and submarine platforms.
	www.sovereign-publications.com /litton1.htm (2107 words)

	Sperry Marine: Marine Gyrocompass Repeaters, Azimuth Circles, Course Recorders & More
		Both prismatic and vane types are made from high quality marine materials for long service life.
		Gyrocompass heading, magnetic compass heading, set heading (course to steer), rate of turn, ship’s speed, latitude and longitude, distance traveled in total miles and daily miles.
		The UDR also provides a unique course recorder function through connection to a standard dot matrix printer, available as an option.
	www.sperrymarine.northropgrumman.com /Products/Gyrocompasses/gyroaccessories/accessories (162 words)

	Elmar A. Sperry
		In 1890, one other event was to set the stage for the practical application of the gyrocompass; the development of the first electrically driven gyroscope by G.M. Hopkins.
		Thus it was that in the last decade of the 19th century, the stage was set for the application of the gyroscope to real world problems.
		That same year, Elmer Sperry invented and introduced the first ballistic gyrocompass, which included vertical damping (his device was subsequently patented with the British in 1911 - Patent Number 15669/11).
	www.becklaser.de /hbeng/sperry1.html (576 words)

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