A.their transmitters
B.their receivers
C.their radars
D.their lorans
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A.if
B.how
C.when
D.where
A.radar
B.omega
C.satellite navigator
D.DF
A.While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B.The satellites are in equatorial orbits around the earth about 60°of longitude apart
C.The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D.The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
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.
（）is not a component of GPS.
What does not contribute to the commercial GPS receiver position error（）.
Loran-C is which type of system（）.
（）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（）.
Radar makes the most accurate determination of the（）.
In using Loran-C，skywave reception gives greater range but is（）.
Would you mind（）your DF?
The loran lines drawn on navigation charts represent（）.