# Surveying Questions and Answers – GPS Surveying Techniques

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “GPS Surveying Techniques”.

1. Which of the following can be affected by atmospheric path disturbances?
a) Modern GPS surveying
b) Conventional GPS
c) Absolute positioning
d) Resection method

Explanation: Modern GPS surveying can be affected by atmospheric conditions. It can produce more accuracy in its output when compared to pseudo ranging method. This method costs more and is effective for engineering applications.

2. Which among the following can be described as an application of pseudo ranging?
a) Computation of distance between satellite and user
b) Computation of distance between GPS antenna and satellite
c) Computation of distance between GPS antenna and user
d) Computation of distance between satellite and object

Explanation: Application of pseudo ranging involves in computing distance between GPS antenna and satellite by correlation between transmitted code and reference code. It needs synchronization between transmitter and receiver clock signal.

3. By using pseudo ranging method, two dimensional and three dimensional GPS positions can be located.
a) True
b) False

Explanation: In the process of pseudo ranging, at least four observations are taken. By using these, the solution of 2D and 3D GPS positions can be determined. But in general, only three are required for 2D GPS positions.

4. Which of the following error occurs due to atmospheric conditions?
a) Natural error
b) User error
c) Propagation error
d) Signal multipath error

Explanation: Signal multipath is an error in GPS tracking, which is generated by atmospheric interference errors. It can be expressed in terms of the reflected signal from geographic based buildings, high rocks.

5. Which of the following is not used in the tracking system?
a) Multiple frequency
b) Dual frequency
c) Single frequency

Explanation: The GPS surveying includes tracking system, off which the civilian navigation, military navigation, single frequency and the dual frequency are used. These possess carrier waves which can be used for further processing of the function.
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6. Which of the following doesn’t belong to the relative positioning techniques?
a) Real-time kinematic technique
b) Viscous GPS technique
c) Kinematic GPS surveying technique
d) Differential GPS technique

Explanation: The relative positioning technique involves static and kinematic GPS surveying technique, differential GPS technique, and real-time kinematic technique. These are to be identified before conducting the GPS surveying method.

7. Which of the following classes of positioning technique possess high precision?
a) GPS
b) Viscous technique
c) Real time technique
d) Kinematic technique

Explanation: The real time kinematic technique is having a high precision, which use carrier phase measurements in the instantaneous positioning mode. It is considered as the most powerful GPS positioning technology.

8. Which among the following indicates the correct set of static GPS surveying technology classification?
a) Long and normal base lines
b) Medium and short baselines
c) Long and short baselines
d) Normal and short base lines

Explanation: The classification of the static GPS surveying involves long baseline GPS technique and Short baseline GPS technique. Both are determined based on the length of the base line taken into consideration.

9. What will be the length of the base line in case of short baseline method of GPS surveying?
a) Less than 50km
b) Greater than 50km
c) Less than 2km
d) Greater than 100km

Explanation: In the case of short baseline of GPS surveying, baselines would be typically less than 50km. they can support the control network applications with data processing packages.

10. Which of the following is considered as modern GPS technology?
a) GIS
b) GPS mode
c) Instantaneous mode
d) Kinematic positioning technique

Explanation: Among the different GPS surveying techniques available, the kinematic positioning technique is considered as the modern GPS surveying technology. It requires the usage of all the specialized hardware and software as well as new filed procedures.

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