Deck 4: Finding Your Location With the Global Positioning System

Question 1

Selective availability describes which of the following?

A)Incorrect data deliberately transmitted from GPS satellites
B)Why GPS does not function underground
C)"Dead zones" where GPS cannot function at all
D)Using a U.S.Coast Guard Beacon to get a better position determination

Answer 1

A

Question 2

Ephemeris error can result in what level of error in GPS accuracy?

A)About 2 meters
B)About a few centimeters
C)About 100 meters
D)About 5 millimeters

Answer 2

A

Question 3

Which of the following statements is correct concerning GPS signals and codes?

A)The C/A and P codes are both transmitted on both L1 and L2.
B)The C/A code is transmitted on L1 and the P code is transmitted on L2.
C)The C/A code is transmitted on L1 and the P code is transmitted on L1 and L2.
D)The C/A code is transmitted on L1 and L2 while the P code is transmitted on L2.

Answer 3

C

Question 4

When the GPS signals bounce off objects to arrive later than anticipated,which of the following types of errors is occurring?

A)Almanac
B)PDOP
C)Multipath
D)Tropospheric

Question 5

The Russian equivalent of GPS is

A)Comrade.
B)Glonass.
C)Rodina.
D)Compass.

Question 6

Explain why a minimum of three satellites is necessary to determine a receiver's position using GPS.Also,describe why a fourth satellite is used in position determination.

Question 7

When the correct satellite position is not being sent,what type of error is being encounted?

A)PDOP
B)Selective availability
C)Multipath
D)Ephemeris

Question 8

The Master Control station for the U.S.GPS is located in

A)Hawaii.
B)Colorado.
C)Washington,D.c.
D)South Dakota.

Question 9

Which of the following receivers can pick up the military P-code?

A)Dual frequency
B)Single frequency
C)Covert frequency
D)Biaxial frequency

Question 10

EGNOS is the European equivalent of

A)GPS.
B)WAAS.
C)PDOP.
D)Compass.

Question 11

High-tech "treasure hunting" that is assisted with GPS is referred to as

A)geofencing.
B)geocaching.
C)geosearching.
D)geostationing.

Question 12

The U.S.GPS is called

A)NAVSTAR.
B)GNSS.
C)Galileo.
D)Transit.

Question 13

The distance between a receiver and one satellite is referred to as

A)the almanac.
B)the pseudorange.
C)one-way ranging.
D)the ephemeris.

Question 14

The use of a base station or other Earth-bound source to transmit a correction signal to a GPS receiver refers to

A)CORS.
B)DGPS.
C)WAAS.
D)MSAS.

Question 15

Describe the basic operation of an SBAS in increasing the accuracy of GPS.

Question 16

The datum used by GPS is

A)NAD27.
B)NAD83.
C)WGS84.
D)NADCON.

Question 17

The European equivalent of GPS is

A)Merlin.
B)Galileo.
C)Copernicus.
D)Timation.

Question 18

Use of WAAS can reduce position error to within

A)30 meters.
B)15 meters.
C)3 meters.
D)1 meter.

Question 19

The encrypted version of the P code is the

A)C/A code.
B)Y code.
C)X code.
D)E code.

Question 20

Which of the following systems is designed to operate in Japan?

A)Gagan
B)Beidou
C)IRNSS
D)QZSS