• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/58

Click to flip

58 Cards in this Set

  • Front
  • Back
NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 1
NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 1
Tactical navigation is directly
concerned with maneuvering the ship
in navigable waters. TRUE OR FALSE.
1. True
2. False
Estimating ship’s position between
known navigational points or fixes
is known as
1. ship maneuvering
2. dead reckoning
3. ship reckoning
4. dead maneuvering
Radio navigation consists of which
of the following categories?
1. Sub-space systems
2. Space–based systems
3. Terrestrial systems
4. Both 2 and 3 above
One of the characteristics of dead
reckoning is that the accuracy of
the estimated position never
exceeds the navigation method used to obtain the last fix. What
happens to the accuracy of the
estimated position over time?
1. It increases
2. It decreases
3. It stays the same
4. It fluctuates
Referring to landmarks with known
positions on earth describes which
one of the following navigation
methods?
1. Celestial
2. Charting
3. Dead reckoning
4. Piloting
Which of the following actions
required to determine position in
piloting is/are not required in
electronic navigation?
1. Seeing the landmarks
2. Determining the ship’s heading
3. Having the ship on a dead
reckoned course
4. Both 2 and 3 above
According to the 1992 Federal Radio
Navigation Plan, which of the
following systems will become the
primary reference navigation system
for surface ships?
1. LORAN
2. OMEGA
3. NAVSTAR
4. TACAN
LORAN takes advantage of what radio
signal characteristic?
1. Constant amplitude
2. Constant velocity
3. Constant phase
4. Constant volume
OMEGA is a hyperbolic phase—
difference measuring system that
compares the phase angle of two or
more radio signals synchronized to
what device or factor?
1. A common receiver
2. A common signal shift
3. A common time base
4. A common transmitter
Which navigation system continually
computes the latitude and longitude
of a ship by sensing acceleration?
1. NAVSTAR
2. OMEGA
3. MILSTAR
4. SINS
A ship’s inertial navigation system
is dependent on celestial, sight,
and radio navigation aids. TRUE OR FALSE?
1. True
2. False
What device measures changes in
speed or direction along the axis
in which it lies?
1. Gyroscope
2. Accelerometer
3. Axilometer
4. Servoscope
What type of system is used to keep
a SINS platform stabilized?
1. Servo
2. Synchro
3. Gyro
4. Turbo
Which of the following is a standalone
SINS?
1. AN/WSN-5
2. AN/WSN–25
3. AN/WRN-6
4. AN/WRN-8
Approximately how often can
operators using the NNSS obtain
fixes?
1. Every hour
2. Every 2 hours
3. Every 3 hours
4. Every 4 hours
NNSS satellites transmit phase
modulated data every 2 minutes on
how many rf carriers?
1. One
2. Two
3. Three
4. Four
What are the two types of NNSS
satellite parameters included in
the phase-modulated data?
1. Systems and command
2. Terrestrial and space
3. Status and update
4. Fixed and variable
The nominal orbit of NNSS
satellites is what type of orbital
parameter?
1. Status
2. Command
3. Systems
4. Fixed
NNSS satellite data can be used as
an accurate time reference. TRUE OR FALSE?
1. True
2. False
NNSS satellite refined orbits are
calculated at which of the
following facilities?
1. Tracking station
2. Control station
3. Computer center
4. Injection station
Which of the following facilities
calculates NNSS satellite clock
error before satellite message
injection?
1. Control center
2. Computer center
3. Tracking station
4. Injection station
Approximately how long does it take
the injection station to transmit
information to an NNSS satellite?
1. 10 seconds
2. 12 seconds
3. 15 seconds
4. 18 seconds
If errors are detected during a
readback of freshly injected
satellite data, how often is NNSS
satellite message injection
repeated until the transmission is
verified as being correct?
1. Every 20 seconds
2. Every 2 minutes
3. Every 2 hours
4. Every 12 hours
At what point during the satellite
pass will expansion effects cause
the received frequencies to drop
below the generated frequencies?
1. T1
2. T2
3. T3
At what point will the received
frequencies exactly match the
transmitted frequencies?
1. T1
2. T2
3. T3
At what point will compression
effects cause the received
frequencies to be higher than the
transmitted frequencies?
1. T1
2. T2
3. T3
Which of the following factors
affects the measurement of Doppler
shift?
1. Refraction
2. Reflection
3. Reduction
4. Reproduction
To solve the problem of Doppler
shift accuracy, satellites are
designed to transmit on how many
frequencies?
1. One
2. Two
3. Three
4. Four
Accurate NNSS position fixes for a
moving vessel require what
additional computation?
1. Vessel’s draft
2. Vessel’s length
3. Vessel’s speed
4. Vessel’s class
Which ship’s system will provide
the information required to perform
the additional computation required
by NNSS?
1. OMEGA
2. LORAN
3. PNNS
4. SINS
Given the orbital parameters of a
satellite, the Doppler shift of the
signal transmitted from that
satellite, and the velocity of a
vessel, it is possible to obtain a
navigational fix if the satellite
is within what distance from the
navigation set?
1. Skip zone
2. Line–of–sight
3. Scatter zone
4. Line-of-support
One of the capabilities of the
AN/WRN-5 includes time-ordered
alerts for up to how many
satellites?
1. Six
2. Two
3. Eight
4. Four
What is the “at sea” accuracy of
the AN/SRN-19(V)2?
1. 0.25 feet
2. 0.25 meters
3. 0.25 miles
4. 0.25 kilometers
What activity may degrade the
accuracy of the AN/SRN-19(V)2?
1. Ship’s maneuvers
2. Sunspots
3. Rain
4. High sea state
You are initializing the AN/SRN–
19(V)2. In addition to programing
the set’s position, what other
parameter must you enter?
1. Antenna height
2. Ship’s length
3. Usable power
4. Cabling length
What navigational system will
replace the NNSS?
1. NAVSTAR GPS
2. OMEGA MK2
3. LORAN D
4. NNSS MK2
Which of the following terms
describe GPS satellite positioning
data?
1. Update and status
2. Variable and fixed
3. Daily and hourly
4. Almanac and ephemeris
How often is the GPS satellite
navigation data message updated?
1. Every hour
2. Every 12 hours
3. Every 24 hours
4. Every 36 hours
What facility transmits the data
required to update the GPS
satellite navigation data message?
1. Manned control center
2. Manned tracking station
3. Unmanned monitor station
4. Unmanned injection station
There are how many (a) active spare
and (b) active operational GPS
satellites?
1. (a) 21 (b) 3
2. (a) 3 (b) 21
3. (a) 3 (b) 24
4. (a) 24 (b) 21
How many earth orbits will each GPS
satellite complete in a 24–hour
period?
1. One
2. Two
3. Three
4. Four
What communications technique is
used for GPS satellite broadcasts?
1. Spontaneous–emission
2. Spread–spectrum
3. Standard–broadcast
4. Spectral–emission
GPS satellites are positioned so a
minimum of how many satellites are
observable to a user anywhere on
earth?
1. One
2. Two
3. Three
4. Four
Which of the two codes (C/A and P)
transmitted by GPS satellites is
NOT available to civilian users?
1. Course acquisition code
2. Precise code
Which of the following data is
NOT included in the GPS NAV–msg?
1. Clock–bias
2. Correction data
3. Ephemeris
4. Spectral
GPS navigation is based on what
principle?
1. Satellite ranging
2. Satellite speed
3. Satellite broadcast
4. Satellite response
Within how many feet can GPS
determine position fixes?
1. 50
2. 250
3. 500
4. 1000
To obtain the above accuracy, how
many satellite inputs are required?
1. Five
2. Two
3. Three
4. Four
How is the time difference between
satellite transmission and when the
navigation set receives this signal
related to the distance between the
satellite and the receiver?
1. Inversely proportional
2. Directly proportional
GPS satellites use atomic clocks;
the receivers do not. What type of
error must be computed based on
this fact?
1. Delay
2. Eccentricity
3. Modulation
4. Clock
Tropospheric delay is predicted and
included in what satellite data?
1. Bias
2. Almanac
3. Variable
4. Precision
Ionospheric delay is greatest when
a signal is received from directly
overhead.
1. True
2. False
Of the frequencies listed below,
which one will ionospheric delay
phase–shift the most?
1. 1227.60 MHz
2. 1575.42 MHz
3. 1883.65 MHz
4. 2879.23 MHz
Satellite signals reflecting off
one or more objects before reaching
the navigation set produce what
type of reception?
1. Multipath
2. Faded
3. Skip-zone
4. Ground-wave
What data do operators enter into
the AN/WRN-6(V) to speed up
satellite acquisition?
1. Satellite type
2. Time and date
3. Current position
4. Both 2 and 3 above
Which of the following is the
normal operating mode of the
AN/WRN-6(V)?
1. Initialization
2. Test
3. Navigation
4. Tracking
Which of the following is a
portable GPS receiver?
1. AN/WRN–6
2. AN/WSN-5
3. AN/PSN–8
4. AN/SPA-2