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35 Cards in this Set
- Front
- Back
– General position and time data applicable to all satellites.
A) Selective Availability B) Almanac Data C) SIPRNET |
Almanac Data
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– A character set that contains both letters and digits, but usually some other characters such as punctuation.
A) Almanac Data B) Alphanumeric C) Azimuth |
Alphanumeric
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– A security technique used to protect against hostile at-tempts to imitate GPS satellite signals.
A) Almanac Data B) Azimuth C) Anti-spoofing |
Anti-spoofing
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– An angle measured clockwise in the horizontal plane between a reference direction and any other line. The reference is North (true, magnetic, or grid).
A) Azimuth B) Primary JSRC C) SIPRNET |
Azimuth
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– The JSRC which is responsible for following all of the activity for a specific Radio Set and be ready to take over responsibility for prosecuting the rescue if the Primary JSRC can not.
A) Figure of Merit B) Almanac Data C) Backup JSRC |
Backup JSRC
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– A code used by navigation sets to acquire satellites and perform rough navigation calculations.
A) C/A Code B) Figure of Merit C) Primary JSRC |
C/A Code
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– The amount of position error that can exist when satellites are being tracked.
A) Figure of Merit B) Primary JSRC C) Almanac Data |
Figure of Merit
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– There are 5 frequencies programmed into each Radio Set at the factory. The frequencies are 121.5 MHz, 123.1 MHz, 243.0 MHz, 282.8 MHz, and 406.025 MHz. These frequencies cannot be changed or deleted by the user.
A) Mean Sea Level B) Primary JSRC C) Fixed Frequencies |
Fixed Frequencies
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– The direction in which the longitudinal axis of an aircraft or ship is pointed, expressed in degrees clockwise from North (true, magnetic, compass, or grid).
A) Primary JSRC B) Course C) Heading |
Heading
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– A numbering system using the base 16.
A) Selective Availability B) Hexadecimal C) Course |
Hexadecimal
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– The Base Station maintains a database of all of the users it has assigned time slots to. Each Radio Set that has been assigned a time slot is said to be “in the CSEL net”. To enter the net, the Radio Set operator must send at least one UHFSATCOM immediate mode message. Being in the net is required for the JSRC to send messages to the specified Radio Set.
A) Almanac Data B) Course C) In the Net |
In the Net
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– The intended path of movement in the horizontal plane expressed in degrees from North (true, magnetic, or grid).
A) Course B) Primary JSRC C) Crypto Key |
Course
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– Cryptographic (encoded) data provided to the receiver to enable full capabilities of the SA/A-S function.
A) Crypto Key B) Mean Sea Level C) Azimuth |
Crypto Key
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– This is a JSRC that has been designated as the overarching JSRC. Any messages which are not deliverable to the Primary or Backup JSRCs will be delivered to the CSC. Additionally any messages for which a destination cannot be determined will be sent to the JSRC designated as the CSC.
A) Primary JSRC B) CSEL Support Center (CSC) C) Azimuth |
CSEL Support Center (CSC)
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– The reference frame for a selected map coordinate system.
A) Ephemeris Data B) Datum C) Crypto Key |
Datum
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– Eastward (that is left to right) reading of grid values on a map.
A) Crypto Key B) Ephemeris Data C) Easting |
Easting
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– The distance above (positive) or below (negative) mean sea level or datum surface.
A) Elevation B) Crypto Key C) Mean Sea Level |
Elevation
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– Specific position and clock data peculiar to a particular satellite.
A) Crypto Key B) Elevation D) Ephemeris Data |
Ephemeris Data
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– An antenna that is an integral (built-in) part of a unit.
A) Integral Antenna B) Magnetic Variation C) Elevation |
Integral Antenna
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– Angular distance from a primary great circle or plane, as on the celestial sphere or the earth.
A) Longitude B) Latitude C) Magnetic Variation |
Latitude
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– Angular distance along the Equator, between the meridian passing through a position and, usually, the meridian of Greenwich.
A) Magnetic Variation B) Latitude C) Longitude |
Longitude
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– Direction of the vehicle measured from magnetic north.
A) Latitude B) Magnetic Heading C) Magnetic Variation |
Magnetic Heading
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– The horizontal angle at a place between the true north and magnetic north measured in degrees and minutes east or west according to whether magnetic north lies east or west of true north.
A) Magnetic Variation B) Course C) Magnetic Heading |
Magnetic Variation
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– The elevation reference used for special topographical (map) applications, from which calculation or measurement may be taken.
A) Map Datum B) Mean Sea Level C) Military Grid Reference System (MGRS) |
Map Datum
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– The elevation reference used for normal applications, from which calculation or measurement may be taken.
A) Mean Sea Level B) Figure of Merit C) Military Grid Reference System (MGRS) |
Mean Sea Level
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– A system that uses standard-scale grid square, based on a point of origin on a map projection of the earth's surface in an accurate and consistent manner to permit either position referencing or the computation of direction and distance between grid positions. A position is described by a series of numbers and letters to de-scribe a grid zone, a 100,000 meter square, and a distance to the east followed by a distance to the north both measured from the coordinate origin of the square.
A) Figure of Merit B) Military Grid Reference System (MGRS) C) Mean Sea Level |
Military Grid Reference System (MGRS)
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– A unit of distance; the length of 1 minute of any great circle of earth, the meridian being the great circle most commonly used.
A) Azimuth B) Primary JSRC C) Nautical Mile |
Nautical Mile
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– Northerly (that is bottom to top) reading of grid values on a map.
A) Magnetic Variation B) Northing C) Selective Availability |
Northing
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– The JSRC that has been designated as the one responsible for prosecuting the rescue.
A) Course B) Military Grid Reference System (MGRS) C) Primary JSRC |
Primary JSRC
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– Direction of the north geographical pole.
A) True North B) Nautical Mile C) Military Grid Reference System (MGRS) |
True North
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– The projection on the surface of the earth of the present path of a vehicle, the direction of which path at any point is expressed in degrees from North (true, magnetic, or grid)
A) Primary JSRC B) Track C) Military Grid Reference System (MGRS) |
Track
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– Generation of satellite signals to cause errors in navigation and position information.
A) Anti-spoofing B) Primary JSRC C) Spoofing |
Spoofing
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– Secret Internet Protocol Routed Network. This is the DISN network used by the Base Stations and the JSRC to communicate the CSEL messages. The network is cleared for data up to Secret.
A) Crypto Key B) SIPRNET C) Primary JSRC |
SIPRNET
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– A security technique that limits the accuracy of a receiver by broadcasting GPS information that contains built-in errors.
A) Selective Availability B) Figure of Merit C) SIPRNET |
Selective Availability
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– The horizontal distance between any given point and an object or target. Horizontal Range is the same as Great Circle Distance.
A) Range B) Figure of Merit C) Nautical Mile |
Range
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