Global automatic direction finder market is segmented by
type into portable direction finder, base station direction finder, vehicle
mounted direction finder. Automatic Direction Finder is an instrument that
intercepts and uses electromagnetic radiation in the radio portion of the
spectrum to determine the direction of the radio transmitter. A direction
finder (DF) can be used by an aircraft or ship as a navigational aid.
Automatic direction finding (ADF) is an electronic aid to
navigation that identifies the relative bearing of an aircraft from a radio
beacon transmitting in the MF or LF bandwidth, such as NDB or commercial radio
broadcasting station. Fundamentally ADF consist of a loop aerial which is
rotated physically or electronically and defects the direction of minimum
reception from the beacon comparative to the aircraft direction. The aircraft
apparatus combines the relative bearing with heading information from the
aircraft compass to provide bearing position lines which may be plotted on the
chart in the global automatic direction finder industry.
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Radio conclusion direction is dependent for its operation
upon the fundamental principle that certain types of aerial are highly
directional, so that at a certain angular relationship between the plane of the
aerial and a radio transmitter, the response of the aerial is at a maximum.
Such aerials are often in the form of a loop, in which case the strongest
signal is received when the plane of the loop is in line with the transmitting
station.
In ADF, the aerial is commonly rotated by servo-motors until
maximum response is obtained; and the bearing of the station relative to the
fore-and-aft line of the aircraft is indicated on a graduated dial in the
cockpit. It may also be designated aurally finished earphones or loudspeaker.
The bearings from a radio compass may be used for position fixing (from two
stations) tracking towards a transmitter, homing, holding, stacking or by
obtaining a succession of timed bearings from one station for distance
calculation.
The use of A.D.F. is complicated by the necessity for very
accurate tuning to the chosen radio transmitter on the ground so that the best
results may be obtained; and the technique to be followed during homing in
making payment for aircraft drift relative to the radio bearing.
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A.D.F. generally covers the frequency band between
190-1,750k/cs which includes broadcast stations and marine and aeronautical
M.F. beacon systems. One or two A.D.F. receivers are considered virtually
standard equipment for commercial aircraft and military aircraft are very
frequently so equipped. Navigation aids on the minced are still such as to make
A.D.F. in many areas almost indispensable. But caution and experience are
required for well-organized and safe operation. Being based
The automatic direction finder industry is segmented, By
Application into Vessel Traffic and Search and rescue.
The automatic direction finder industry is geographically
segmented into North America, Latin America, Middle East and Africa,
Asia-Pacific, Europe.
The key players in the automatic direction finder Industry
include Rockwell Collins, Rohde-schwarz, RHOTHETA, Taiyo, GEW, Thales,
BendixKing, TCI（SPX）, TechComm,
Caravan, and Comlab.
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