This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “GPS Accuracy”.
1. Which among the following is more accurate in its output?
a) Absolute positioning
b) Resection method
c) Modern GPS surveying
d) Conventional GPS method
View Answer
Explanation: Though there might be an improvement in modern GPS surveying, it lags behind the conventional GPS method in terms of accuracy. Conventional GPS methods serve as an ideal method for obtaining accurate output by having less impact of the orbital error.
2. Absolute positioning is not useful in precise GPS.
a) False
b) True
View Answer
Explanation: Absolute positioning is not much recommended in case of precise GPS because of the fact that it lacks accuracy in its output. It can find its application in case of military areas and in the commercial GPS system.
3. Precise positioning service is having an accuracy range of ____________
a) 1-5 m
b) 5-9 m
c) 10-12 m
d) 15-20 m
View Answer
Explanation: Precise Positioning Service is equipped with a receiver which is able to track P-code. Its accuracy range is about 10-12 m which receives single frequency, with more precision in output.
4. Which of the following indicates the correct set of classification for absolute positioning?
a) Carrier wave, pseudo range
b) Pseudo range, SPS
c) SPS, carrier wave
d) Absolute positioning, SPS
View Answer
Explanation: Absolute positioning involves a huge procedure which is sub divided into categories. Those include usage of the carrier wave and usage of pseudo range. Based on the type of work carried out, these are employed.
5. Which of the following process is adopted in case of navigation system?
a) SPS
b) Carrier wave
c) Relative positioning
d) Pseudo ranging
View Answer
Explanation: Pseudo ranging can be adopted in case of navigation because it contains reference systems, which must be defined and maintained without direct access to the origin. Carrier wave fails in this case.
6. Which process can obtain more accuracy in position?
a) Carrier wave method
b) Absolute positioning
c) Relative positioning
d) Resection method
View Answer
Explanation: Relative positioning is capable of delivering the accuracy in its output as it takes observations with respect to one another. This process is beneficial for differentiating horizontal geodetic network.
7. Which of the following will affect the accuracy of the GPS positioning?
a) Receiver station
b) Strength of signal
c) Position of satellite
d) Atomic clock
View Answer
Explanation: The GPS accuracy depends upon the receiver station and the atmospheric conditions. In case of dull atmosphere, the information transmitted cannot reach the receiver end at a full length.
8. Which among the following can act as a cause wrong GPS tracking?
a) Refraction of signal
b) Strength of signal
c) Atomic clock
d) Reflection of satellite signals
View Answer
Explanation: It is known that sometimes GPS shows wrong placement of the location tracked. This is due to blockage of the satellite signal by buildings, reflection of satellite signals, jamming of the signals.
9. The accuracy speed of the GPS depends on ______________
a) Reflection of signal
b) Signal blockage
c) Refraction of signal
d) Position of satellite
View Answer
Explanation: They factors which can affect the accuracy speed of the signal include satellite geometry, signal blockage, atmospheric conditions and receiver design quality. All of these can create a huge impact on the speed of accuracy of the signal.
10. The clock used in GPS will synchronize to __________
a) Greenwich
b) ITC
c) UTC
d) IS
View Answer
Explanation: GPS uses an atomic clock which can help in recording the time of signal receiving and transferring. This needs to be in sync with the Co-ordinated Universal Time (UTC) which is maintained by the U.S. This helps the time recording process at the ground station too.
Sanfoundry Global Education & Learning Series – Surveying.
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