Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
115 Cards in this Set
- Front
- Back
|
What is azimuth |
Angular position or bearing in a horizontal plane |
|
|
What is bearing on reference to navigation |
The angular position of an object with respect to a reference point or line. |
|
|
What is diffusion |
The spreading out of energy or particles from an area of high concentration to low concentration, due to random velocity and scattering. |
|
|
What is divergence |
Energy loss caused by spreading in all directions |
|
|
What is modulation |
The process of varying the amplitude or frequency of a carrier wave. |
|
|
What is propogation |
Transmitting of signals into space. |
|
|
What is the range is reference to navigation |
The distance of an object from the observer. |
|
|
What is thermal conduction |
The transfer of heat through contact |
|
|
Why is b- scope so important |
It's simple circuit scan that provides range, azimuth, and bearing |
|
|
How is radar timing expressed |
In microseconds |
|
|
One nautical mile is how many feet? |
6080ft |
|
|
How long does RF energy take to travel one nautical mile |
6.18 microseconds |
|
|
How do pulse types radars determine range |
By measuring the time it takes the emitted pulse to travel to the target and return. |
|
|
How long does it take the emitted pulse to travel one nautical mile and then back to the atenna. |
12.36 microseconds |
|
|
What happens if an aircraft is closer then the minimum pulse range |
It will not be seen because the receiver will not be operational before the return pulse. |
|
|
What determines maximum rsnge |
Peak power of the transmitted pulse |
|
|
What's happens if aircraft is beyond the maximum pulse range |
Will not be seen because it will not be a strong enough pulse return. |
|
|
What is azimuth |
Horizontal placement in respect to true north |
|
|
What is range resolution |
The minimum resolvable separation in range of two objects with the same bearing. |
|
|
What is true range |
The actual distance between the target and radar set. |
|
|
What is true range called in airborne radar m |
Slant range |
|
|
What is slant range |
Range measurement that includes the effect of difference in altitude. |
|
|
What is horizontal range |
The straight line distance of a target along an imaginary line that runs parallel to the earths surface. |
|
|
What is the principal factor that effects radar |
Maintenance |
|
|
What is the peak power of a radar |
The radars useful power |
|
|
As peak power increases what also increases in radar. |
It's range capabilities |
|
|
What is receiver sensitivity |
The measure of the ability of a receiver to amplify a weak signal. |
|
|
What does the transmitter do |
Generates RF energy in the form of short and power pulses. |
|
|
What does the antenna system do |
Transmits and receives RF pulses |
|
|
What does the receiver do |
Amplifies the weak return signal |
|
|
What does the indicator do in a radar set |
Provides a visual indication of the echo pulses. |
|
|
How many modes of operation are there on the IFF system |
5 ,mode 1,2,3/A, c,4 |
|
|
What makes up the challenging set in the IFF system |
Interrogator, synchronizer, and radar units. |
|
|
What's makes up the responder |
The transponder |
|
|
What modes of IFF is used exclusively by the military for tactical modes for target identification |
Modes 1 and 2 |
|
|
What mode of IFF is used by both military and civilian |
Mode 3/A |
|
|
What does mode C in an IFF system provide |
Altitude info |
|
|
In an IFF system what is mode 4 used for |
Secure encrypted mode |
|
|
What is position |
A pint defined by stated or implied coordinates. |
|
|
What is direction |
The position of one point in space relative to another. |
|
|
What is course |
The intended horizontal direction of travel. |
|
|
What is heading |
The horizontal direction in which an aircraft is pointing |
|
|
What is true heading |
Direction of the geographic North Pole as the reference |
|
|
What is magnetic heading |
The direction of the earths magnetic field at that location as the reference |
|
|
What is bearing |
The actual compass compass direction of the forward course of the aircraft |
|
|
What is distance |
Separation between two points |
|
|
What direction do lines of latitude run |
North and south |
|
|
Longitude runs |
East and west |
|
|
What does Doppler radar do |
Detects and shows actual ground speed and drift of an aircraft |
|
|
What do radar altimeters do |
Give the actual distance from the aircraft to the surface of earth |
|
|
What is radio navigation |
A complex bit considerably accurate navigational aid. |
|
|
What is celestial navigation |
Using celestial bodies to determine aircrafts position |
|
|
What is inertial navigation |
A navigational aid that uses newtons laws of motion to provide dead reckoning |
|
|
What is dead reckoning |
Line of sight navigation |
|
|
What are radar transponders |
Devices that do not operate until interrogated or triggered into action. |
|
|
What is radar navigation |
Navigation using radar system |
|
|
what does an horizontal situation indicator (HSI) do |
provides the pilot with a visual indication of the navigational situation of the aircraft
|
|
|
what are the two basic types of navigation |
position fixing and dead reckoning |
|
|
what info do you get from a navigation system that provides ground info |
the ground position of the aircraft |
|
|
what does it mean when a navigation system has global coverage |
The system positions and steers the aircraft accurately and reliably any place in the world
|
|
|
what does it mean if a navigation system is self-contained |
it does not rely on ground transmission of any kind |
|
|
what does it mean if a navigation system is passive |
it does not transmit so it cant give away the position of the parent aircraft |
|
|
what does it mean if a navigation system is immune to countermeasures |
the system is not affected by any type of countermeasures |
|
|
what does it mean if a navigation system is useless to the enemy |
the system does not provide any intel for the enemy to use |
|
|
what does the automatic direction finder (ADF) do
|
provides aircraft location in reference of a ground station |
|
|
what does TACAN do |
provides bearing with reference to a ground station
|
|
|
what are SENSORS |
data-gathering units such as RADAR, ILS, and TACAN |
|
|
what frequency band is up to 300Hz |
extremely low frequency (ELF) |
|
|
what frequency band is in the 300Hz-3kHz range |
voice frequency (VF
|
|
|
what frequency band is in the 3kHz-30kHz range |
very low frequency (VLF) |
|
|
what frequency band is in the 30kHz-300kHz range |
low frquency (LF) |
|
|
what frequency band is in the 300kHz-3MHz range |
medium frequency (MF
|
|
|
what frequency band is in the 3MHz-30MHz range |
high frequency (HF) |
|
|
what frequency band is in the 30MHz-300MHz range |
very high frequency (VHF
|
|
|
what frequency band is in the 300MHz-3GHz range |
ultrahigh frequency (UHF) |
|
|
what frequency band is in the 3GHz-30GHz range |
superhigh frequency (SHF) |
|
|
what frequency band is in the 30GHz-300GHz |
extremely high frequency (EHF) |
|
|
what frequency bands are limited to line-of-sight communications |
VHF and up |
|
|
What is amplitude modulation |
A method used to vary the amplitude of an electromagnetic carrier frequency |
|
|
What is a carrier frequency |
A radio frequency (RF) wave suitable for modulation |
|
|
Purpose of electronic countermeasures (ECM) |
Protect a single aircraft from an enemy radar |
|
|
Three types of ECM |
Passive(PECM), electronic, and non electronic |
|
|
What does electronic ECM equipment prevent enemy radar from doing |
Tracking the aircraft accurately |
|
|
What does electronic ECM equipment prevent enemy aircraft fire control radar from doing |
Prevents it from locking on |
|
|
What is active ECM |
ECM electronic equipment designed to jam communications, navigation, and radar receivers |
|
|
What are jammers |
High-noise, noise-modulated transmitters that transmit random noise over s given band of frequencies. |
|
|
What are some examples of non electronic ECM equipment |
Chaff and flare |
|
|
What is the best way to detect submerged enemy submarines |
Its disturbance of the local magnetic field of the earth (MAD) |
|
|
What is MAD |
Magnetic anomaly detection |
|
|
What are sonobuoys |
Aircraft-deployed, expendable sonar sets that contain a VHF radio transmitter to relay acoustic information to the deploying aircraft |
|
|
Primary I'm disadvantage to amplitude modulation |
Susceptibility to noise interference and the inefficiency of the transmitter |
|
|
Two type of sonobuoys |
Passive and active |
|
|
What is a passive sonobuoy |
A "listen only" sonobuoy |
|
|
What is DIFAR |
A directional low frequency analysis and recording machine |
|
|
What does a LOFAR system do |
Detects sounds emitted by a submarine through a hydrophone from a passive omnidirectional sonobuoy |
|
|
Two types of angle modulation |
Frequency modulation and phase modulation |
|
|
What is frequency modulation |
The carrier frequency is varied |
|
|
What is an antenna |
Special type of electrical circuit intentionally to radiate and/or receive electromagnetic energy |
|
|
What is the simplest type of antenna |
Bidirectional bipole |
|
|
What is a datalink system |
Communications link that provides computer to computer exchange of information |
|
|
A modern data link system has what components installed on the aircraft |
1) General purpose digital computer 2) switching logic unit(SLU) 3) data terminal set(DTS) 4)integrated radio control (IRC) 5) secure data Meyer 6) HF and UHF communication system |
|
|
What is the purpose of electronic countermeasures (ECM) |
To detect, analyze, locate, and degrade the use of an enemy's electronic warfare equipment |
|
|
What is the purpose of electronic support measures (ESM) |
To detect(receive), plot(locate), and analyze the signal characteristics of a suspected enemy's communications; navigation, and radar equipments |
|
|
What is a LOFAR system |
A low frequency analysis and recording system |
|
|
What is the basic acoustic sensing system is used in a passive sonobuoy |
LOFAR |
|
|
What does DIFAR system do |
Detects directional info using a passive sonobuoy |
|
|
What two systems use passive sonobuoys |
LOFAR AND DIFAR |
|
|
What two systems use passive sonobuoys |
LOFAR AND DIFAR |
|
|
What are two types of active sonobuoy |
Self timed and commendable |
|
|
What does a self-timed sonobuoy do |
Generates a sonar pulse at fixed pulse length and interval |
|
|
What does a commandable sonobuoy do |
Generates a sonar pulse, as determined by a UHF command signal from the controlling aircraft. |
|
|
How does an active sonobuoy work |
Radiates a sonar(sound) pulse that is reflected from the hull of submarines |
|
|
What kind of system does an active sonobuoy use |
Command active sonobuoy system( CASS) |
|
|
What does the CASS in an active sonobuoy do |
Allows the sonobuoy to remain silent until it receives a command signal from the aircraft to radiate a sound pulse. |
|
|
What is a DICASS sonobuoy |
A CASS sonobuoy equipped with a directional hydrophone |
