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36 Cards in this Set
- Front
- Back
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define a radiowave
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also called an electromagnetic wave, it is a burst of energy transmitted by a radar sensor through the atmosphere or space
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what is the part of the radio wave that bounces back to the antena ?
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echo or return
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identify the 'brain" of the radar system. why is that so ?
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synchronizer, because it coordinates the opertion of various parts of the radar.
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explain the function of the modulator
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to provide an extremely large, very short, swuare-wave pulse of DC (direct current) voltage to the transmitter
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what device allows a single antenna to both transmit and receive ?
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the duplexer
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what is the antenna's purpose during transmission and reception?
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during transmission to concentrate the radiated energy into a shaped beam from an antenna that points in the desired direction. during eception it collects the energy contained in the echo signals and delivers it to the receiver
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what component of the radar seperates wanted from unwanted signals ?
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the receiver
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Define hte terms "PRF" and "PRT" and explain why they are important
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PRF is the number of times the radar the radar transmits per second.PRT is transmission time plus resting time or the beginning of one pulse to the next. It is important because the lower the PRF the longer the PRT and greater range of the radar system
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what is a pulse doppler radar ?
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one that sends out pulsed radar signals and if a target is detected, the receiver detects a shift or change in frequency. The change in frequency is known as the doppler shift
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how are airborne radars able to distinguish targets from grond returns ?
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dopler shift is only produced by moving targets
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how does a phased array radar move the radar beam ?
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electronically and mechanically
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what type of IFF/SIF transponders do we use today ?
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Mark XII
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how many IFF/SIF modes are there and who uses them?
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7. military and the FAA
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what mode is used by the Air Force to identify aircraft squadron and tail number ?
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mode 2
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what is the difference between mode 3 and mode A ?
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nothing.they are identical . mode 3 is the military whil mode A is the civilian equilivant.
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what information is provided by mode C ?
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the altitude
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how is the IFF/SIF interrogation a questioning process ?
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interrogate means to question
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why are the IFF/SIF pulses transmitted after the radar pulses ?
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they canonly interrogate one mode at a time
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what is interlacing?
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when a different mode is interrogated each PRT.
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list the three mode 3A emergency codes and their meaning.
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7700 general emergency
7600 radio out/lost comm. 7500 hijack |
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how is mode 4 different from the other modes?
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it is secure
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what is special pilto identification, or SPI ?
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when you get a specific display from a pilot to stand out from other returns. The pilot turns on a switch on transponder to flash the position.
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how can IFF/SIF be useful for detection and tracking ?
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the signal could be much stronger than the radar return
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in what frequency range does the ARSR-4 operate ?
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1215 - 1400 MHz
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how does the ARSR-4 radar increase weather processing capabilities ?
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it incorporates a completely sepeate weather channel and processing path apart from target channels
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where have the ARSR-4 radars been installed ?
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CONUS, Guan, Hawaii,and Guantanamo Bay,Cuba
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what is the total number of waveguide radiators that transmit on the TPS-75 ?
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48
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at what speed does the TPS-75 radar antenna rotate ?
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6.5 rpm (+/-10 % )
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on the TPS-75 what is the minimum and maximum distane from the radar shelter to the antenna pallet ?
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7 to 21 feet
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what is the altitude limit of the FPS-117 ?
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100,000 ft
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how many frequencies can be set for the FPS-117 to frequency-hop on ?
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18
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what countries have installed the FPS-117 for long range detection ?
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Alaska
Canada Iceland |
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what system across alaska and Canada uses the FPS-124 radar ?
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NWS
North Warning System |
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what is the altitude limit for the FPS-124 radar ?
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15,000 ft
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how many reportable tracks per scan can the FPS-124 process and foward ?
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20
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what is the primary function of the FPS-124 ?
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to fill gaps in coverage of the AN/FPS- 117 along the NWS
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