Lecture 6 GPS study questions &
Answers rated A+
What does GNSS stand for? How does it differ from GPS? - correct answer ✔✔ GNSS stands for
Global Navigation Satellite systems. GNSS is a combination of GPS, GALILEO, and GLONASS.
What it the minimum number of satellites needed for an accurate positional location? - correct
answer ✔✔ 4. Three calculate your latitude and longitude, the fourth calculates your altitude.
What two key types of information are sent by GNSS satellites to receivers that allow for the
determining of position? - correct answer ✔✔ 1. Almanac: data sent from the satellite (time,
health, etc)
2. Ephemeris: Data on the locations and whereabouts of the other satellites.
Explain the causes of two different types of dilution of position error and how those errors can
be minimized. - correct answer ✔✔ 1. PDOP: When satellites are more clustered together, the
information given is less accurate. This error can be minimized by having satellites be more
dispersed, evenly over the Earth, so that connection can be utilized rather than minimized.
2. Differential GPS: Connection and data shared directly between a receiver and satellites can
sometimes be discrepant, so by adding a control station on ground to correct differences, there
is a higher accuracy in the data a GPS receives.
How is distance from a GNSS satellite to a receiver measured? - correct answer ✔✔ Each
satellite sends a signal down to the receiver. These signals travel at the speed of light, and the
GPS calculates the differences and figures out the distances between itself and the satellite,
therefore with more calculations the GPS can figure it's location based off the data measured
and calculated.
Answers rated A+
What does GNSS stand for? How does it differ from GPS? - correct answer ✔✔ GNSS stands for
Global Navigation Satellite systems. GNSS is a combination of GPS, GALILEO, and GLONASS.
What it the minimum number of satellites needed for an accurate positional location? - correct
answer ✔✔ 4. Three calculate your latitude and longitude, the fourth calculates your altitude.
What two key types of information are sent by GNSS satellites to receivers that allow for the
determining of position? - correct answer ✔✔ 1. Almanac: data sent from the satellite (time,
health, etc)
2. Ephemeris: Data on the locations and whereabouts of the other satellites.
Explain the causes of two different types of dilution of position error and how those errors can
be minimized. - correct answer ✔✔ 1. PDOP: When satellites are more clustered together, the
information given is less accurate. This error can be minimized by having satellites be more
dispersed, evenly over the Earth, so that connection can be utilized rather than minimized.
2. Differential GPS: Connection and data shared directly between a receiver and satellites can
sometimes be discrepant, so by adding a control station on ground to correct differences, there
is a higher accuracy in the data a GPS receives.
How is distance from a GNSS satellite to a receiver measured? - correct answer ✔✔ Each
satellite sends a signal down to the receiver. These signals travel at the speed of light, and the
GPS calculates the differences and figures out the distances between itself and the satellite,
therefore with more calculations the GPS can figure it's location based off the data measured
and calculated.
