radio range

radio range

      in aerial navigation, a system of radio transmitting stations, each of which transmits a signal that not only carries identification but also is of intrinsic value to a navigator in fixing his position. The older “A–N” type, dating from 1927, operates at low and medium frequencies. The only equipment needed in the aircraft is an ordinary radio receiver. Each station transmits International Morse Code (Morse Code) letters A (· —) and N (— ·) in alternate lobes of its radiation pattern. In the narrow radiants where adjacent lobes overlap, the dots and dashes of the different Morse signals blend into a continuous tone. A pilot following the steady tone knows he is flying directly toward the station or away from it; when he strays off course, he knows, by virtue of which letter he hears (A or N), which way to turn in order to get back on course.

      Modern very-high-frequency (VHF) omnidirectional range (VOR) has been developed in various forms since about 1930. It transmits two signals simultaneously in all directions. Operating in the very high frequency (VHF) range, it is less subject than the lower-frequency radio range to disturbances by day-night alternation, weather, and other causes. The two simultaneously emitted signals have a difference in electrical phase that varies precisely with the direction from the station. Special receiving equipment in the aircraft detects the difference and displays it to the pilot in the form of a bearing. Used with distance-measuring equipment (DME), VOR provides a basic point-to-point guidance system for airliners.

* * *

Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • radio range — noun : a radio facility providing means for aiding in the navigation of airplanes * * * radio range, 1. the reach of a radio beam or beams emitted by a radio beacon. 2. the station emitting such beams; radio beacon …   Useful english dictionary

  • radio range — range in which a radio can broadcast signals …   English contemporary dictionary

  • radio range beacon — noun : a radio beacon that transmits in such a way as to mark out a fixed straight line (as for directing the course of airplanes to or from a landing field) * * * a radio transmitter that utilizes two or more directional antennas and transmits… …   Useful english dictionary

  • radio range station — A radio navigation land station in the aeronautical radio navigation service providing radio equi signal zones. (In certain instances a radio range station may be placed on board a ship.) …   Military dictionary

  • radio-range station — A radio navigational land station in the aeronautical radio navigational service providing radio equisignal zones. These are obsolete. See also radio range …   Aviation dictionary

  • radio range station — noun : a radio transmitter that provides the signals used in a radio range …   Useful english dictionary

  • radio range-finder — radijo tolimatis statusas T sritis Gynyba apibrėžtis Tolimatis, kuriame atstumams matuoti naudojamos centimetrinės ir milimetrinės radijo bangos. Radijo tolimatis gali būti pasyvusis ir aktyvusis, impulsinio ir nenutrūkstamo spinduliavimo.… …   Artilerijos terminų žodynas

  • radio range finding — radiotelemetrija statusas T sritis Gynyba apibrėžtis Radiolokacijos metodas, kuriuo atstumas iki pasirinkto objekto nustatomas pagal objekto skleidžiamas radijo bangas, gaunamas tiesiogiai, atspindėtas ar retransliuotas tuo pačiu ar kitu dažniu.… …   NATO terminų aiškinamasis žodynas

  • radio range station — radiotelemetrijos stotis statusas T sritis Gynyba apibrėžtis Antžeminė radionavigacijos stotis, veikianti aeronautikos radionavigacijos tarnyboje, suteikianti lygiasignales radijo zonas. (Kai kuriais atvejais stotis gali būti laive.) atitikmenys …   NATO terminų aiškinamasis žodynas

  • radio range — noun Date: 1929 a radio facility for aircraft navigation …   New Collegiate Dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”