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23 Cards in this Set

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  • Back
What are the commonly used methods for Navigating?
Piloting
Celestial navigation
Radio navigation
What is the estimating of the ship’s position between known navigational points or fixes?
Dead reckoning
Name some electronic navigation systems
1. Long Range Aid to Navigation (LORAN)
2. VLF Radio Navigation (OMEGA)
3. Ship’s Inertial Navigation System (SINS)
4. Navy Navigation Satellite System (NNSS)
5. NAVSTAR Global Positioning System (GPS)
Which system takes advantage of the constant velocity of radio signals to use the time lapse between the arrival of
two signals to measure the differences in distance
from the transmitting stations to the point of
reception?
LORAN
Which system is a hyperbolic phase-difference measurement system?
OMEGA
T or F
A minimum of two transmitters are required to obtain a basic position fix.
T
How many are necessary for an acuurate fix?
Three or four are necessary to obtain an accurate
fix.
What does SINS stand for?
Ship’s Inertial Navigation System
Which system is a navigation system that (after initial latitude,longitude, heading, and orientation conditions are set into the system) continuously computes the latitude and longitude of the ship by sensing acceleration.
SINS
SINS has the following advantages
1. It is self-contained.
2. It requires minimal outside
information.
3. It cannot be jammed.
4. It is not affected by adverse weather
conditions.
5. It does not radiate energy.
6. It is not detectable by enemy sensors
What are some of the basic components of an inertial navigation system?
1. accelerometers
2. gyroscopes,
3. servo systems,
4. computers
Which componant measure changes in speed or direction along the axis in which they lie?
Accelerometers
Which system are installed on auxiliary ships.
AN/WSN-2 systems
Which system are installed on submarines?
AN/WSN-2A
Which systems are installed or being installed on surface combatants?
AN/WSN-5
Which system adds an increased level of Which system adds performance to serve as an inertial navigator and provides additional analog and digital outputs?
AN/WSN-5
What system is highly accurate, world-wide, all weather system enables navigators to obtain fixes approximately every 2
hours, day or night
NAVY NAVIGATION SATELLITE SYSTEM
What is the distance Satellites placed in a circular polar orbit
500 to 700
nominally 600 nautical miles
What factor complicates
the fact that satellite transmissions must pass through the earth’s upper atmosphere on their way from space to the receiver?
Measurement of Doppler shift
What are two most common satellite navigation AN/WRN-5(V) RADIO NAVIGATION SET
systems used by the Navy?
AN/WRN-5 and the
AN/SRN-19
What types of atmospheric delay can affect the
accuracy of navigation set signal measurements?
Tropospheric
Ionosphere
The Satellite Signals Navigation Set __________computes accurate position coordinates, elevation,
speed, and time information from signals transmitted by
NAVSTAR Global Positioning System (GPS) satellites.
AN/WRN-
6(V)
__________are used for taking depth soundings.
Fathometers