LO2 Flashcards
What is the principle of gps based on?
Time
What is RAIM (Receiver Autonomous Integrity Monitoring)?
A stand alone system algorithm monitoring the entire system to assess the integrity of GPS signals in a GPS receiver system.
What is Almanac data?
-Almanac data allows each satellite to know the exact position of all the other satellites within the satellite constellation.
-The data is shared and transmitted both to CONTROL and to each individual satellite.
What is HDOP?
The Horizontal Dilution of Precision Latitude and Longitude.
What is UTM Grids?
(Universal Transverse Mercator)
The UTM system consists of 60 zones, each 6-degrees of longitude in width.
What is PPP?
(Precise Point Positioning).
It is a pay as you use scheme. Differential corrections are transmitted to your receiver via satellite or the internet.
What are the five types of operational satellites?
- GPS
- Galileo
- GLONAS
- BEIDOU
- GNSS
How often are corrections sent to the atomic clocks onboard the satellites?
3 times per day.
What are the three segments of GNSS?
- Control
- Space
- User
What frequency/code does civil GPS receive?
- CA code
- L1 frequency
What is GDOP?
-(Geometric Dilution of Precision)
-It determines how satellite geometry affects the precision of location data.
-The lower the value, the greater the accuracy.
What does the P code stand for?
Precision Code. This is transmitted on an L2 frequency which can be used to calculate the atmospheric delay when used in conjunction with L1.
How many GNSS systems are currently in use?
-GPS
-Galileo
-GLONAS
-BeiDou
What are the components of the GPS signal?
- Space segment.
- Control segment.
- User statement.
What is the difference between WASS and VHF?
-WASS operates via satellite (subscription).
-DGPS operates via VHF (free).
