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85 Cards in this Set
- Front
- Back
What method does an A-scan indicator use to display video?
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Deflection Modulation
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What target information is provided by the plan position indictor (PPI)
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Range and Azimuth
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What type of scan an "paint" a map of the area, to include the areas of heavy rain or clouds?
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Plan position indicator
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In a raster scan indicator, how many vertical scan periods does it take to produce one complete picture?
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two (2)
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which indicator component determines the overall operation of the indicator?
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data processing circuits
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Which indicator components main purpose is to control the intensity of the cathode ray tube electron beam?
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the Video circuits
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Digital display data from the data processing circuits is converted into analog drive signals in the
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deflection circuits
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Electromagnetic deflection is accomplished by applying
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current through the deflection coil
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The vacuum in a cathode ray tube...
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prevents collisions between electrons in the beam and air molecules
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What is the leading edge to leading edge spacing between P1 and P3 of Mode 3?
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8 usec.
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(603) The frequency use for IFF/SIF interrogations is
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1030 MHz
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(604) An X pulse is present in an SIF code train when...
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the aircraft is a pilotless drone or missle
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(604) Which special response explains a 7500 reply?
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Hijacking
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(605) the AN/UPM-155 radar test set is capable of testing
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interregators and associated components
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(605) What possible input voltages may be supplied to the an/upm-155 test set for operation?
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115 vac or 230 vac
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(606) What three components are included within electronic combat (EC)?
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command,control, and communication countermeasures (CjCM),suppresion of enemy air defenses (SEAD), and electronic warfare (EW)
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(606) What are the three primary areas of electronic warfare?
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electronic warfare support (ES), electronic attack (EA) and electronic protection (EP)
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(607) What is the relatively new concept of employing electronic warfare support (ES)
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to provide a tactically oriented immediate response
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(607) The primary role of the electronic warfare support (ES) is a wartime function that provides the military commander a capability that can
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integrate with other operational forces
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(608) Predictable external factors that affect electronic attack (EA) are
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victim radar characteristics and burn through range
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(608) the three major categories that nose jammers can be divided into are
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spot jammers, sweep jammers, and barrage jammers
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(608) A decoy is...
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an expendable aircraft like vehicle used to provide deception
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(609) What transmitter fix is for synchronous pulsed jammers?
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staggered pulse recurrent frequency
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(609) What technique is used in a strong clutter or jamming enviroment to improve target detection?
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Fast time constant (FTC)
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(609) What is the primary receiver on many of the radar sets?
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Linear
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(609) Personnel must be aware of hostile electronic warfare support signal intelligent capabilities when radiating electromagnetic energy to prevent...
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highlighting their intentions or capabilities
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(610) What characteristic of frequency does a radar target moving towards the wsr-88d radar exhibit?
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a higher frequency than the original broadcast
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(610) Transverse velocity is the velocity component of the
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targets moving perpendicular to the radar beam
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(610) The velocity azimuth display (VAD) is
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a plot of radial velocity as a function of azimuth
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(610) Given a wind blowing directly from the east, the antenna scan direction that yields the highest velocity azimuth display profile amplitude is an antenna bearing of...
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east and west
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(611) What is an indication of velocity aliasing ambiguity?
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target motion away from the radar may suddenly appear to be moving towards the radar
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(611) What contemporary term is used to express the display of targets at the wrong range due to system pulse repetition frequency (PRF)
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range folding
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[601] When would you use an electrostatic indicator instead of an electromagnetic indicator?
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when small, lightweight, compact components are used
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[601] How is information presented on the A-scan indicator?
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as a vertical deflection, deflection modulated
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[601] How is time represented on an A-scan indicator?
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by the horizontal distance from the start trigger to the input signal
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[601] How is video presented on a B-scan indicator?
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intensity-modulated electon beam that presents targets as bright spots
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[601] What type of radar uses the B-scan indicator?
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the PAR
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[601] How would elevation and range be presented on a B-scan indicator?
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on the upper portion
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[601] What target information does a PPI scan present?
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range and azimuth
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[601] What type of pattern does a raster scan indicator use to scan the CRT?
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scanning electron beam
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[602] what compenents do all indicators have regardless of type?
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power supplies, data processing circuits, video circuits, deflection circuits and CRT/front panel controls
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[602] What furnishes the operating voltages for the CRT?
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the High Voltage Power Supply
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[602] List the three functions performed by the data processing circuits.
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Data Calculation, Interface, and Data Distribution
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[602] How do the video circuits protect the CRT during certain malfunctions?
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by disabling the HVPS and providing blanking
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[602] How do the data processing circuits specify beam position?
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using X and Y coordinates, with the orgin at the center
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[602] List the two types of CRT's
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electrostatic or electromagnetic
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[602] What part of the CRT shields the electron beam from unwanted electric fields?
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the aquadag
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[602] What is the primary hazard involved with high-vacuum CRT's?
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high vacuum and large surface area make it vulnerable to dangerous implosions
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[602] What do the front panel controls allow the operator to do?
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select input signals, messages, operating parameters, and adjust indicator format
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[603] What are the SIF modes used to interrogate an aircraft?
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Mode 1, 2, 3 and C
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[603] What is the spacing between P1 and P3 pulses for the four SIF modes?
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3, 5, 8, 21 microseconds
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[603]What is the pulse width of P1, p2, and P3 pulses
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.08 us wide
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[603] What is the xmitted frequency of the interrogation pulses?
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1030 mHz
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[603] What is the purpose of transmitting a P2 pulse?
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to eliminate side lobe reception
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[604] What type of code and what are the increments of the altitude information received in Mode C?
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a grey code train of pulses in 100 ft. increments
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[604] What is the width of any given pulse in a SIF reply code train?
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0.45 us wide
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[604] What is the bracket pulse spacing on a normal SIF code train?
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20.3 us
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[604] What signifies that the SIF reply has been xmitted by a missle or drone?
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an X pulse
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[604] What is the purpose of a reply pulse that is 4.35 us after the last bracket pulse of a SIF code train and what is it called?
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Identification of Position, when 2 or more aircraft are responding with the same code and are too close for the operator to diferentiate
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[604] What is the only IFF/SIF mode that can decode civilian emergencies?
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Mode 3/A
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[604] How is a communications emergency received by the ground station?
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By a 7600 emergency reply code
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[604] Which modes will decode military emergencies?
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They can be received in any SIF mode, including C
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[604] Describe a Mode 4 IFF reply...
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It consists of three 0.5 us pulses spaced 1.8 us apart
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[606] What is the goal of electronic combat? (EC)?
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to control selected parts of the electromagnetic spectrum, thus denying its use to the enemy while retaining effective use for friendly forces
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[606] What are three primary areas of electronic warfare (EW)?
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Electronic warfare support, Electronic attack, and Electronic Position
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[606] What does electronic warfare support, electronic attack, and electronic protection do upson initiation of hostilities?
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ES updates intelligence; EA and EP are supplied to support friendly forces
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[607] What does ES provide to its consumer?
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Timely and comprehensive information to the activities it supports
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[606] What is the difference between ES and signal intelligence assets?
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ES assets are totally controlled by the theatre command while SIGINT assets are responsive to national level tasking requirements
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[607] What activities apply to ES?
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Threat location, detection, warning, emitter avoidance, target acquisition, homing and destruction or suppression
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[607] What is required to exploit the EM environment?
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Timely interception and analysis and each xmission likely to contain information that can influence current or future operations
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[607] What information and techniqes does ES provide?
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Information on the location of emitters and information and techniques useful in reducing the effectiveness of hostile weapons and tactics
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[608] What is electronic attack?
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The division of EW involving the use of electromagnetic or directed engery to attack personnel, facilities, or equipment with the intent of degrading, neutralizing, or destroying enemy combat capability
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[608] What is jamming?
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The radiation or reradiation of signals to interfere with the operation of a radar receiver
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[608] What are the predictable external factors that effect jamming?
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Burn through range, victim radar characteristics, and jamming characteristics
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[608] Jammers are divided into what two categories?
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noise jamming and deception jamming
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[608] What is chaff made out of and how does it work?
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Chaff consists of a large number of metallic strips designed to match half the wavelength of the victim radar's RF. It absorbs and reradiates EM energy to create a radar echo
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[609] What is electronic protection?
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The part of EW that includes the measures taken to protect personnel, facilities, equipment..etc.
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[609] What are the common transmitter fixes?
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Frequency agility, CPACS, staggered PRF
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[609] What is meant by frequency agility?
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The ability of a radar to rapidly change from one frequency to another
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[609] What are different types of EP receivers?
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Linear, logarithmic, lin-log, and Dicke-fix receivers
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[609] What type of antenna is added to provide for side lobe cancelling?
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An omnidirectional side lobe reference antenna
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[610] What term describes velocity elements parallel to the radar beam?
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Radial Velocity
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[610] What relationship between target movement and beam orientation would result in a radial velocity of zero?
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the target movement would have to be perpendicular to the beam
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[610] What purposes does the velocity azimuth display algorithm serve in the wsr-88d?
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used to generate wind profiles
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How are target velocities moving toward the radar expressed?
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as negative values
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