dead reckoning

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dead reckoning:

see navigationnavigation,
science and technology of finding the position and directing the course of vessels and aircraft. Early Navigational Techniques

In ancient times, mariners navigated by the guidance of the sun and stars and landmarks along the coast.
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Dead Reckoning


the continuous calculation of the elements of a vessel’s course, such as speed and direction, and the effects of external forces in order to determine the vessel’s coordinates without observation of orientation points on shore or of heavenly bodies. The accuracy of dead reckoning is sufficient for keeping a vessel on the course set and for ensuring navigational safety. The quantities used are the ship’s heading and speed and the drift vector. When dead reckoning is performed on a map, the true course, distances traveled, and the ship’s turning trajectory and drift are calculated and plotted. The use of automatic position plotters in such dead reckoning permits continuous calculation of the vessel’s position; when dead reckoning is done by hand, positions are calculated sequentially at discrete time intervals. Analytic techniques for dead reckoning require the use of calculators.

dead reckoning

[¦ded ′rek·ən·iŋ]
Determination of position of a craft by advancing a previous position to a new one on the basis of assumed distance and direction traveled.

dead reckoning (DR)

dead reckoning (DR)click for a larger image
In navigation, determination of position by advancing a previous known position using courses and distances. This navigational technique employs direct computation, using the triangle of velocities, from which the ground speed can be calculated and the course to steer can be determined. It is also a method of finding one's position by means of a compass and calculations based on speed, time elapsed, effects of wind, and direction from a known position.

dead reckoning

a method of establishing one's position using the distance and direction travelled rather than astronomical observations
References in periodicals archive ?
Cohda's DSRC (Dedicated Short-Range Communications) based V2X system uses accurate satellite positioning with embedded dead reckoning technology provided by u-blox.
u-blox' dead reckoning solution, powered by the LEA-4R GPS module, is ideal for applications that require continuous positioning such as vehicle navigation, fleet management and toll systems.
SiRFDRive for SiRFstarV 5ea now also includes CSR s latest dead reckoning algorithms that work alongside concurrent GPS and GLONASS operations.
u-blox' dead reckoning technology uses additional sensors that detect travelled distance with an odometer and turn rate using a gyroscope, supplementing GPS data and thus providing an accurate position in tunnels, indoor parking facilities, roofed logistics centers, urban canyons and any other environment where obstructed GPS signals hinder positioning.
In 1707, after a maritime disaster caused by an incorrect calculation of a fleet's position (``guess'' is more appropriate, as navigators had no way of really knowing then, using dead reckoning and an unreliable method of computing knots), the British Parliament offered a sum of 20,000 pounds (about $5 million today) to anyone who could solve the problem of finding longitude at sea.
The team were filming in the central Highlands for a new three-part Taggart murder mystery called Dead Reckoning.
However, GNSS technologies will have to be combined with other positioning solutions such as A-GPS, Wi-Fi, and dead reckoning to address the indoor coverage issue.
That was the hope Saturday as about a dozen rover robots roamed the beach while scientists from around the globe talked of autonomous navigation, pitch-and-roll clinometers, rocker-bogie chassis and encoders for dead reckoning.
Leveraging Analog Devices' iMEMS[R] Motion Signal Processing Technology[TM], the ADIS16355 inertial measurement unit (IMU) allows industrial designers for the first time to equip their systems with sophisticated motion analysis and navigational dead reckoning functions previously reserved for defense, aerospace, and other high-end applications, at approximately one tenth of the cost.
NEW ORLEANS, May 8, 2012 /PRNewswire/ -- Trimble (NASDAQ:TRMB) introduced today the Aardvark DR+GPS module that combines Dead Reckoning (DR) with Global Positioning System (GPS) technology on a single, compact board.
Tammy Rogers is the least-known of the artist-owners at the fledgling Dead Reckoning label.
The IDG-1004 enables dead reckoning (DR) and better map matching capability by measuring the direction of the vehicle with one axis, while providing better distance accuracy by measuring slope as the vehicle travels up and down hills or in rough terrain using the second axis.