Title: Chapter 2 GPS
Course: Intro to GPS/GIS Technologies (PTS 101-002) > Section: Assessments

Q: A high Dilution of Precision (DOP) is caused by the satellites grouping close together due to their orbital paths.  What does that mean for the end user?
- The angles required to triangulate a position are so steep that pseudorange expands resulting in poor position quality
- The GPS signal sent from the Satellites cross each other resulting in interference
- Atmospheric errors completely block the signal
A: The angles required to triangulate a position are so steep that pseudorange expands resulting in poor position quality

Q: Another problem is caused by the clocks in either the satellites or receivers being incorrect, even in the slightest amount.  That error is called what?
- Timing Error
- Ephemeris Error
- Atmospheric Error
- Electrical Noise
A: Timing Error

Q: What do duel frequency receivers measure?
A: atmosphere interference

Q: What does the elevation mask do for your receiver?

Q: Extra Credit:  What is the name of the cellular modem product line, made by Raven Industries, that allows wireless data transfers and RTK corrections via cellular network?
- Slingshot
- MyWayRTK
- VRS now
- AgFinity
A: Slingshot

Q: Fill in the Blank:  GPS determines our position on Earth by finding the distance to at least three satellites.  That is done by using the following mathematical equation - DISTANCE = VELOCITY x __________
- Time
- Area
- Pi
- Acceleration
A: Time

Q: What is Glonass?

Q: Whats the difference between the L1 and L2 band?

Q: What is the minimum number of GPS satellites needed for worldwide coverage?
A: 24

Q: If the GPS signal bounces off an object on or near the ground before reaching the receiver, it will again result in an incorrect position.  That error is called what?
- Multipath Error
- Atmospheric Error
- Timing Error
- Ephemeris Error
A: Multipath Error

Q: One of the ways to vastly increase the accuracy in our GPS system is to use an additional correction source called DGPS.  What does the 'D' stand for in DGPS?
- Differential
- Domain
- Digital
- Directional
A: Differential

Q: One way the GPS signal is affected is by the Ionosphere.  The signal gets refracted as it passes ions resulting in a longer path to the ground.  What is that called?
- Atmospheric Error
- Timing Error
- Multipath Error
- Human Error
A: Atmospheric Error

Q: What is a pseudorange?
- Range from you to the reciever
- Estimation of the true range from the GPS receiver to a satellite
- The true range from the receiver to the satellite
- How far you are away from a waypoint
A: Estimation of the true range from the GPS receiver to a satellite

Q: Real-Time Kinematic (RTK) accuracy decreases as the user's GPS receiver moves farther away from the base station.  What would be the cause of the accuracy decreasing?
- Receiver and Base Station will have fewer satellites in common which results in errors caused by "unshared" satelltes - "the corrections are for that specific area"
- The manufacturers place range restrictions into the RTK systems
- The vibration of the user's receiver can no longer be accounted for.
A: Receiver and Base Station will have fewer satellites in common which results in errors caused by "unshared" satelltes - "the corrections are for that specific area"

Q: Why does time run faster in space than it does on earth? How does this effect the GPS?

Q: What is satellite ranging? Why do the receivers range satellites?

Q: The GPS signal can potentially be affected by many different things that result in a false position reading on a user's GPS receiver.  What are those false readings called?
- Errors
- Ephemeris
- Spots
- Oopsies
A: Errors

Q: There are three segments of the GPS system.  Which segment consists of the monitoring of the satellites by the Department of Defense?
- Space
- Control
- User
- Base Station
A: Control

Q: This segment of the GPS System consists of the physical satellites and the transmission of the signal:
- Space
- Control
- User
- DoD
A: Space

Q: True or False:  Differential Corrections are achieved by utilizing the transmission signal from a secondary GPS receiver that is stationary and placed at a known location.
- True
- False
A: True

Q: True or False:  OmniSTAR and StarFire are controlled by the US Coast Guard and they charge a yearly fee to use their service.
- True
- False
A: False

Q: True or False:  One way OmniSTAR and StarFire achieve their levels of accuracy is by utilizing Dual Frequency receivers to receive the best possible GPS signal.
- True
- False
A: True

Q: True or False:  Satellite Based Augmentation Systems (SBAS), such as WAAS or StarFire use radio transmissions to send differentially corrected signals to the user's GPS receiver.
- True
- False
A: False

Q: What is the U.S.A. GPS constellation called?
- NAVSTAR
- Galileo
- Glonass
- DGPS
A: NAVSTAR

Q: What does the acronym GPS stand for?
- Global Positioning System
- Geographic Positioning Satellites
- Geographically Placed Satellites
- Grand Placement Satelltes
A: Global Positioning System

Q: When a GPS receiver is incorrectly installed on a piece of equipment it will create an error when that equipment is used.  What is that error called?
- Timing Error
- Human Error
- Multipath Error
- Ephemeris Error
A: Human Error

Q: Which differential correction signal is the most commonly used, operated by the FAA, and uses geostationary satellites to communicate with the end user's GPS receiver?
- WAAS
- Beacon
- RTK
- OmniSTAR
A: WAAS