Automatic reckoning is at present virtually the only autonomous method of navigation. Its principle consists in the systematic computation of the geographical coordinates of the locus of ship on the basis of information about elements of its motion--track angle and speed. The accuracy of reckoning primarily depends on the accuracy of navigation instruments after taking into account various navigation corrections such as the correction factor for speed, the speed deviation of the gyrocompass, the angle of wind drift and the angle of current drift. Formulas for these corrections are presented and it is shown that their calculation can be automated. Hence also it is possible to automatically obtain data on the track angle and true speed by solving the pertinent equations with the aid of a special-purpose computer. A system of equations, in which the coordinates are given as functions of track angle, course, ship speed and speed correction factors, may be utilized as the basis for developing automatic computers of geographical coordinates of the ship with adjustment for all the navigation corrections. A corresponding functional diagram of the mathematical algorithm of the reckoning problem is presented. The principal vectoring and trigonometric operations in this diagram are carried out with the aid of rotating transformers and decoding follow-up systems. It is shown that on this basis it is possible to develop a new navigation instrument for the automatic calculation of all navigation corrections. To this end it is necessary to develop up-to-date navigation sensors for a sufficiently accurate measurement and telemetering of data on wind speed and direction as well as on drift coefficients; that should not be a major technical problem.

  • Authors:
    • Davydov, P S
    • Chernyshev, V O
  • Publication Date: 1968

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Filing Info

  • Accession Number: 00014615
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Report/Paper Numbers: Russian
  • Files: TRIS
  • Created Date: Aug 12 1971 12:00AM