Weather Radar Flashcards
The longer the distance (what will happen to the transmission pulse rate):
the slower the rate the pulses are transmitted
There is a high speed electronic switch called a ______ which routes the RF energy between the transmitter and antenna, and the antenna and the receiver.
duplexer
The duplexer allows for the use of one antenna to:
both transmit and receive
One RADAR mile measured in time is:
12.36 micro seconds
Plane Position Indicator (PPI) is type of RADAR scope that shows:
distance and direction (azimuth) to the target.
There are no pulses from a Continuous Wave (CW) RADAR because:
it transmits and receives at the same time
Doppler RADAR does not determine distance, but the rate of:
change of distance or velocity
With a stationary target, differences may be created by continuously varying the:
transmitter’s frequency.
The FM return echo will have a slightly different frequency than the outgoing burst. The difference between the frequencies is then:
converted into distance
Due to the difficulty in isolating the transmitter and receiver, and the ease of measuring distance with pulses, CW RADAR is:
not as widely used on aircraft as pulsed RADAR.
What are the six essential components of pulse RADAR systems?
- The synchronizer (timer/keyer)
- The transmitter
- The duplexer
- The receiver
- The antenna
- The display/indicator
Airborne RADAR typically operates in one of two frequency bands:
C-band or X-band
RADAR system frequencies are in which part of the radio frequency spectrum?
Super High Frequency (SHF)
S-band RADAR operates in which frequency band?
2-4GHz
RADAR operating at a frequency of
3 GHz has a wavelength of approximately what?
10cm
The resolution of a RADAR system defines its ability to:
accurately display the various levels of storm activity scanned by the RADAR.
The major advantage of S-Band RADAR over X-Band is:
that it is less affected by weather conditions.
The magnetron makes use of resonant cavities to:
generate the operating
frequency for the transmitted pulse or output signal.
What is “listening time”?
It’s where the RADAR is listening for the return echo from the target.
A short pulse width is used for _____ distance scans.
A long pulse width is used for _____ distance weather scans.
short
long
Remember, the minimum range of a RADAR transmission is:
determined by the transmitted pulse width.
Remember, a duplexer allows the same antenna to:
be used for both transmit and receive.
Resistive losses in a waveguide are very low due to:
the waveguide having a large internal surface area for the signal to travel.
T/R Box (Transmitter Receiver
Box) houses the:
duplexer.
