WorksheetsM13-4 GPS/GNSS
Total questions: 26
Worksheet time: 13mins
What type of data is contained in Block I of the GPS navigation message?
Ephemeris prediction parameters
Clock correction parameters
Approximation of the atmospheric delay
Almanac data
What does AOD indicate in Block I of the GPS navigation message?
Approximation of the atmospheric delay
Time since the last navigation upload
Clock correction parameters
Ephemeris prediction parameters
What type of data is contained in Block III of the GPS navigation message?
Almanac data
Clock correction parameters
Approximation of the atmospheric delay
Ephemeris prediction parameters
What is the primary factor for the safety of a navigation system according to the text?
Accuracy
Availability
Continuity
Integrity
What does DOP stand for in the context of GPS accuracy?
Differential of Precision
Dilution of Precision
Direction of Position
Distance of Position
What is the minimum percentage of time that the GPS SPS is mandated to be available according to the 1996 Federal Radio navigation Plan?
99.85%
95%
98%
99%
What does RAIM stand for in the context of GPS navigation?
Remote Access and Integrity Monitoring
Rapid Assessment of Integrity Monitoring
Receiver Autonomous Integrity Monitoring
Radio Aided Integrity Monitoring
What is the primary purpose of Differential GPS?
To improve measurement precision by using differential methods
To provide precise positioning service for military users
To enhance the availability of GPS signals
To monitor the integrity of GPS satellites
Why is there a need to have reception from 5 satellites to use GPS in aviation?
To obtain height information as well as lateral position
To detect anomalies in Space Vehicles used the navigation solution
Without the fifth satellite only a poor GDOP can be achieved.
What mode does the GPSSU enter when it has decoded ephemeris data to compute a navigation solution?
Navigation mode
Initialization mode
Self-Test mode
Acquisition mode
What is the purpose of the 'Pseudorange' in GPS technology?
To measure the distance between the GPS receiver and the satellite
To determine the speed of the GPS receiver
To calculate the time delay in GPS signal transmission
To estimate the position of the GPS receiver
What does the 'Ephemeris' data in a GPS signal provide?
Information about the GPS satellite's health status
Information about the GPS satellite's precise orbital location
Information about the atmospheric conditions affecting the GPS signal
Information about the GPS satellite's clock correction parameters
What is the purpose of the 'Clock Correction Parameters' in the GPS navigation message?
To correct the time delay in GPS signal transmission
To correct the GPS receiver's internal clock
To correct the GPS satellite's atomic clock
To correct the time difference between the GPS receiver and the satellite
What is the best position for satellites for good GDOP?
What is the basic concept behind GPS?
Measuring the color of satellites in space
Measuring the temperature of satellites in space
Measuring the speed of satellites in space
Measuring the distance from a group of satellites in space
How many satellite ranges are needed to unambiguously locate a position?
Three
Four
Two
One
What is the purpose of the Master Control Station in Colorado Springs?
To monitor the health of GPS receivers
To control the orbits and clocks of GPS satellites
To transmit corrections to GPS satellites
To measure the altitude of GPS satellites
How many GPS satellites are in orbit?
24
18
30
12
What is the function of the GPS receiver in an aircraft?
To generate the navigation message
To convert satellite signals into position, time, and velocity
To control the orbits of GPS satellites
To transmit corrections to GPS satellites
What is the frequency of the L1 signal transmitted by GPS satellites?
50 bps
10.23 MHz
1227.60 MHz
1575.42 MHz
What type of GPS antenna design is commonly used in modern aircraft?
Side mounted low profile antenna
Rear mounted omnidirectional antenna
Top mounted active antenna
Bottom mounted passive antenna
What is the frequency of the P/Y-code?
1575.42 MHz
1227.60 MHz
10.23 MHz
50 bps
What type of data is included in the navigation message transmitted by GPS satellites?
Status of the space vehicle
Weather information
Satellite images
Radio frequencies
What is the function of the almanac data in a GPS system?
To provide information about the health of the satellite
To provide information about the current date and time
To provide information about the orbits of all GPS satellites
To provide information about the location of the GPS receiver
What is the function of the atomic clocks in GPS satellites?
Select all correct answers
To provide precise timekeeping for the satellite's onboard computer
To provide the time stamp for the navigation message
To provide the frequency for the GPS signals
To provide provide synronisation for communication from user segments
Which of these statements for GPS accuracy is correct?
The largest error is produced by the ionospheric delay and can be corrected by all users using the 2 frequencies transmitted from the satellite.
Geometric Dilution Of Precision depends on Position, Horizontal and Vertical only.
σp=GDOP x σm and the optimum position is one satellite overhead and three on the horizon, 120° apart in azimuth
