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ET1 SEP EXAM 2018 > NAVEDTRA 14090, ELECTRONICS TECHNICIAN, VOLUME 5-NAVIGATION SYSTEMS > Flashcards

NAVEDTRA 14090, ELECTRONICS TECHNICIAN, VOLUME 5-NAVIGATION SYSTEMS Flashcards

1
Q

What is a method of getting from one known point to some distant point known as?

A

Navigation

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2
Q

Which type of navigation primarily deals with fixing the location of the platform to enable installed weapon systems to function against intended targets, prevent ownership loss to or interference with friendly weapon systems, and coordinate ownership weapon systems with those of other platforms to achieve maximum effect?

A

Tactical

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3
Q

What is the estimating of the ship’s position between known navigational points or fixes?

A

Dead reckoning

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4
Q

Which branch of navigation is a ship’s position determined by referring to landmarks with known positions on the earth?

A

Piloting

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5
Q

Which long-distance radio navigation system is used by ships at sea to obtain a position fix?

A

Long Range Aid to Navigation (LORAN)

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6
Q

Which type of navigation involves comparing the phase angles of two or more radio signals that are synchronized to a common time base?

A

Hyperbolic

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7
Q

Which type of navigation system continuously computes the latitude and longitude of the ship by sensing acceleration?

A

Ship’s Inertial Navigation System (SINS)

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8
Q

Which type of navigation system has a major security advantage over other types of navigation systems because it is completely independent of celestial, sight, and radio navigation aids?

A

Ship’s Inertial Navigation System (SINS)

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9
Q

What are used to measure changes in speed or direction along the axis in which they lie?

A

Accelerometers

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10
Q

Which model of Ship’s Inertial Navigation Systems (SINSs) are installed or being installed on surface combatants as of the time of this publication?

A

AN/WSN-5

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11
Q

Which artificial satellite allowed scientists to realize that navigation based on satellite signals was possible?

A

Sputnik I

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12
Q

Which year was the first satellite successfully launched?

A

1960

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13
Q

Which altitude are Navy Navigation Satellite System (NNSS) satellites placed in a circular polar orbit?

A

500-700 nm

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14
Q

Approximately how many minutes does it take Navy Navigation Satellite System (NNSS) satellites to orbit?

A

107

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15
Q

Measurement of Doppler shift is complicated by the fact that satellite transmissions must pass through the earth’s upper atmosphere on their way from space to the receiver. Which layer contains electronically charged particles which cause refraction of these transmissions?

A

Ionospheric

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16
Q

The AN/WRN-5 along with which other satellite are the two most common satellite navigation systems used by the Navy at the time of this publication?

A

AN/SRN-19

17
Q

Which radio navigation set is an automatic shipboard navigation set that provides a continuous display of the ship’s position?

A

AN/SRN-19(V)2

18
Q

Which space-based, radio navigation system provides continuous, extremely accurate three-dimensional position, velocity, and timing signals to users world-wide?

A

NAVSTAR GPS

19
Q

How many active operational satellites along with 3 active spare satellites are in circular orbits at the time of this publication?

A

21

20
Q

Which principle is GPS navigation based on?

A

Satellite ranging

21
Q

How many sources of error must be compensated for in order for satellite ranging to provide accurate position data?

A

3

22
Q

What is the most common shipboard GPS receiver at the time of this publication?

A

AN/WRN-6

23
Q

How many types of atmospheric delay can affect the accuracy of navigation set signal measurements?

A

2

24
Q

The Satellite Signals Navigation Set AN/WRN-6(V) computes accurate position coordinates, elevation, speed, and time information from signals transmitted by NAVSTAR Global Positioning System (GPS) satellites. In the P mode, it has an accuracy of how many meters?

A

16

25
Q

What are used for taking depth soundings?

A

Fathometers

26
Q

Which geometric system is used to locate points on a plane?

A

Polar-coordinate

27
Q

Which polar-coordinate type radio air-navigation system provides an aircrew with distance information, from distance measuring equipment (DME), and bearing (azimuth) information?

A

Tactical Air Navigation (TACAN)

28
Q

How many pulse pairs-per second, per airborne equipment, in principle, would the Tactical Air Navigation (TACAN) transponder need reply to aircraft interrogations at to supply the necessary distance data?

A

30

29
Q

For the Tactical Air Navigation (TACAN) transponder to provide azimuth information, the average power supplied to the antenna must be relatively uniform over time. Which principle is the transponder operated on to accomplish this?

A

Constant-duty-cycle

30
Q

Before an aircrew can use Tactical Air Navigation (TACAN) information that its equipment receives, it must positively identify the transmitting TACAN station. How many second intervals does the ground station transmit an identification code at to meet this need?

A

30

31
Q

What are errors arising from imperfections in the phase measuring circuits and radio propagation effects known as?

A

Site error

32
Q

Which Tactical Air Navigation (TACAN) signals have top priority?

A

Reference bursts

33
Q

How many types of antennas are used with the AN/URN-25?

A

2

34
Q

The Tactical Air Navigation (TACAN) set can be operated in either the X or Y mode to increase the available channels. Which mode changes the pulse pair spacing and the auxiliary burst count and spacing, and increases system delay?

A

Y

35
Q

Which antenna group is a solid-state, high-performance, electronically-scanned, all-band TACAN antenna system, complete with integral monitoring system and built-in fault isolation capability?

A

OE-273/URN

36
Q

How many interrogating aircraft can the Tactical Air Navigation (TACAN) AN/URN-20 SET simultaneously provide individual distance measuring service for?

A

100

ET1 SEP EXAM 2018 (28 decks)

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