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Data Acquisition > Chapter 4 > Flashcards

Chapter 4 Flashcards

1
Q

GPS

A

the Global Positioning System, a technology using signals broadcast from satellites for navigation and position determination on Earth

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2
Q

NAVSTAR GPS

A

the United States Global Positioning System

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3
Q

GNSS

A

the global navigation satellite system, an overall term for the technologies that use signals from satellites to find locations on Earth’s surface

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4
Q

space segment

A

one of the three segments of GPS, consisting of the satellites and the signals they broadcast from space

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5
Q

constellation

A

the full complement of satellites comprising a GNSS

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6
Q

control segment

A

one of the three segments of GPS, consisting of the control stations that monitor the signals from the GPS satellites

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7
Q

user segment

A

one of the three segments of GPS, consisting of the GPS receivers on the ground that pick up the signals from the satellites

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8
Q

channels

A

the number of satellite signals a GPS unit can receive

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9
Q

single frequency

A

a GPS receiver that can pick up only the L1 frequency

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10
Q

dual frequency

A

a GPS receiver that can pick up both the L1 and L2 frequency

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11
Q

almanac

A

data concerning the status of a GPS satellite, which is included in the information being transmitted by the satellite

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12
Q

ephemeris

A

data referring to the GPS satellite’s position in orbit

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13
Q

C/A code

A

the digital code broadcast on the L1 frequency, which is accessible by all GPS receivers

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14
Q

P code

A

the digital code broadcast on the L1 and L2 frequencies, which is accessible by the military

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15
Q

Y code

A

encrypted version of the P code

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16
Q

Pseudorange

A

the calculated distance between a GPS satellite and a GPS receiver

17
Q

trilateration

A

finding a location in relation to three other points of reference

18
Q

3D trilateration

A

finding a location on Earth’s surface in relation to the positions of three satellites

19
Q

selective availability

A

the intentional degradation of the timing and position information transmitted by a GPS satellite

20
Q

PDOP

A

the position dilution of precision - it describes the amount of error due to the geometric position of the GPS satellites

21
Q

multipath

A

an error causes by a delay in the signal due to reflecting from surfaces before reaching the receiver

22
Q

DGPS

A

Differential GPS - a method using a ground-based correction in addition to the satellite signals in position determination

23
Q

NDGPS

A

National Differential GPS - it consists of ground-based DGPS locations around the United States

24
Q

CORS

A

Continuously Operating Reference Stations - a system operated by the National Geodetic Survey to provide a ground-based method of obtaining more accurate GPS positioning

25
Q

SBAS

A

Satellite based augmentation system - a mtheod of using correction information sent from an additional satellite to improve GPS position determination

26
Q

WAAS

A

Wide Area Augmentation System - a satellite based augmentation system that covers the United States and other portions of North America

27
Q

GLONASS

A

the former USSR’s (now Russia) GNSS

28
Q

Galileo

A

the European Union’s GNSS, currently in development

29
Q

Compass

A

China’s GNSS, currently in development

30
Q

EGNOS

A

an SBAS that covers Europe

31
Q

MSAS

A

an SBAS that covers Japan and nearby regions

32
Q

GPX

A

a standard file format for working with GPS collected by GPS receivers

33
Q

geocaching

A

using GPS to find locations of hidden objects based on previously obtaining a set of coordinates

34
Q

geocoin

A

a small coin used in geocaching with a unique ID number that allows its changing location to be tracked and mapped

Data Acquisition (2 decks)

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