单项选择题
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A.10 meters
B.20 meters
C.50 meters
D.100 meters
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相关考题
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单项选择题
What does not contribute to the commercial GPS receiver position error（）.
A.Satellite clock
B.Ship's speed
C.Atmospheric/ionospheric propagation
D.Receiver -
单项选择题
To obtain accuracy in fixing by DF，（）and three stations should be used.
A.Parallel bearings
B.Long-range bearings
C.Short-range bearings
D.Cross bearings -
单项选择题
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
A.High frequency pulses
B.Combinations of high and low frequency pulses
C.The same frequency for all stations in a chain
D.Varied long and short pulses
