A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
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A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
A.Skip zone
B.Blackout zone
C.Diffraction zone
D.Shadow zone
最新試題
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
Would you mind（）your DF?
What does not contribute to the commercial GPS receiver position error（）.
Which one of the followings does not limit the effective range of radar（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
（）is not a factor which will affect the accuracy of GPS receiver.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
Would you please（）on the radar?