midterm questions

Question 1

which of the following is not an example of a NAVigation system with Time and Ranging

Answer 1

Japan - Himawari

Question 2

which of the following is an example of an absolute coordinate system

Answer 2

Geographic Coordinate System

Question 3

advantages of using GPS do not include

Answer 3

can be used underground

Question 4

which of the following is the master control station for gps

Answer 4

colorado spring

Question 5

a gps satellite has three key pieces of hardware

Answer 5

computer, atomic clock, and radio transmitter

Question 6

each satellite passes over at least one monitoring station _______ a day

Answer 6

twice

Question 7

which of the following vector data structure was developed by USGS

Answer 7

DLG - digital line graph

Question 8

which of the following values would you use for elevation mask on a gps receiver

Answer 8

15

Question 9

north carolina state plane coordinate system uses

Answer 9

lambert confirmal conic projection

Question 10

which of the following errors could not be eliminated using post-processing methods (such as differential correction)?

Answer 10

multipath

Question 11

which of the following accurately describes the timekeeping mechanism aboard GPS satellites

Answer 11

each GPS satellite possesses four atomic clocks to maintain precise synchronization and reliability

Question 12

which of the following values can be used for your PDOP mask setting on your gps receiver

Answer 12

6

Question 13

thinking about GPS error sources, which of the following sources is not considered as random error

Answer 13

satellite clock

Question 14

about the role GPS base station, which statement is correct

Answer 14

it provides correction signals to rovers

Question 15

about Circular Error Probable (CEP), which of the following statements is correct?

Answer 15

75% of the fixes will fall within the CEP circle, and 25% outside

Question 16

about 2DRMS (similar to CEP), which statement below is correct

Answer 16

with 2DRMS, 95% of the fixes will lie within a circle with this radius

Question 17

DOP stands for

Answer 17

dilution of precision

Question 18

____________ can achieve centimeter or millimeter level accuracy

Answer 18

Only C
C. Survey Grade GPS

Question 19

____________ are used to control gps movements and maintain accurate system setting (such as removing clock errors)

Answer 19

GPS ground stations

Question 20

Which of the following best describes the relationship between the distance from a gps receiver to a base station and the resulting error in fix accuracy

Answer 20

the error increases linearly with the distance between the receiver and the base station

Question 21

which type of orbit is frequently utilized for navigation systems such as the US GPS?

Answer 21

Medium Earth Orbit (MEO)

Question 22

in which order were the following navigation system with time and ranging (NAVSTAR) constellations established, earliest to latest

Answer 22

GPS, Glonass, Galileo, Beidou, Qzss, Navic

Question 23

which organization is responsible for creating the most popular topographic maps for use within the US

Answer 23

USGS United States Geological Survey

Question 24

please explain the role of gps upload stations

Question 25

what are almanac and ephemeris? what is the difference between them

Question 26

describe the mechanism by which GPS receivers are able to simultaneously receive signals from multiple satellites

Question 27

design a GPS project to compare accuracies of different types of GPS receivers such as mapping vs recreational grade receivers.

Question 28

what method does the GPS receiver employ to estimate the travel time of GPS signals? can you determine the distance between the satellite and receiver when the signal is sent at 4:00:00 and received at 4:00:07

Question 29

describe the major factors that contribute to error of GPS measurements, and how would you avoid them

Question 30

what is differential correction, how would you select base stations, and how would you set up your own base station