FS FS - Fundamentals of Surveying GPS and GNSS Technology 1 — Questions and Answers
Question 1: What does GNSS stand for in satellite navigation?
- Global Navigation Satellite System (Correct answer)
- Geodetic Network Survey Standard
- Geographic Navigation Signal System
- Ground Network Satellite Survey
Correct answer: Global Navigation Satellite System
GNSS stands for Global Navigation Satellite System, an umbrella term covering all satellite navigation constellations worldwide.
Question 2: A minimum of how many satellites must be visible for 3D GPS positioning?
- 2
- 3
- 4 (Correct answer)
- 5
Correct answer: 4
At least 4 satellites are required for 3D positioning to solve for x, y, z coordinates and receiver clock error simultaneously.
Question 3: What does DOP stand for in GPS accuracy assessment?
- Differential Orbital Position
- Dilution of Precision (Correct answer)
- Data Output Protocol
- Digital Observation Parameter
Correct answer: Dilution of Precision
DOP (Dilution of Precision) describes how satellite geometry affects the accuracy of a GPS position fix.
Question 4: Which GPS observation method provides the highest accuracy for control surveying?
- Autonomous standalone GPS
- WAAS-corrected GPS
- Static differential GPS (Correct answer)
- Real-time navigation GPS
Correct answer: Static differential GPS
Static differential GPS provides the highest accuracy by collecting data over extended occupation periods at known and unknown stations simultaneously.
Question 5: What is the carrier wave frequency of the GPS L1 civilian signal?
- 1227.60 MHz
- 1575.42 MHz (Correct answer)
- 1176.45 MHz
- 1023.00 MHz
Correct answer: 1575.42 MHz
The GPS L1 carrier frequency is 1575.42 MHz, which carries the C/A code used by civilian receivers.
Question 6: Which US agency operates the National CORS network used by surveyors?
- USGS
- FAA
- NOAA (Correct answer)
- US Army Corps of Engineers
Correct answer: NOAA
NOAA operates the National Continuously Operating Reference Stations (CORS) network, which provides GPS correction data across the US.
FS FS - Fundamentals of Surveying GPS and GNSS Technology 1
What does GNSS stand for in satellite navigation?