Lesson 308 Radar Imagery Theory Flashcards Preview

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Flashcards in Lesson 308 Radar Imagery Theory Deck (17):
1

What does the acronym RADAR mean?

Radio detection and ranging

2

What principle is RADAR based on?

RADAR is based on the idea of reflected energy. The stronger the reflected signal, the larger the particle.

3

List the 5 components of a RADAR system.
TRAPD

Transmitter
Receiver
Antenna
Processor
Display

4

What do the abbreviations PPI and CAPPI stand for?

Plan Position Indicator
Constant Altitude Plan Position Indicator

5

What are Echo Tops?

A representation of the highest altitude where detectable precipitation is observed.

6

Define wavelength.

The distance from crest to crest or trough trough in a wave train.

7

Define frequency

The path that the wave travels in one wavelength is called a cycle and the number of cycles in a given unit of time (1 second) is called the frequency.

8

Define propagation

Normal RADAR energy refracted with the earth's curvature approximately 4/3 that of the earth.

9

List in order the reflective capabilities of hydrometeors.
LRSSC

Large hail >80% of wavelength
Rain
Small hail <20% of wavelength
Snow
Clouds

10

Define Attenuation and list the three types
SAR

A lessening of the concentration of energy per unit volume of the beam.
Scattering
Absorption by atmospheric gases
Range

11

Define Distortion

Misrepresentations of the target in any of its parameters.

12

What are the 3 distortions due to RADAR design?
BPP

Beam width
Pulse length
Processor distortion

13

What are the 4 distortions due to propagation characteristics?
FREP

Fringing
Range
Earth curvature
Precipitation attenuation

14

What are extraneous echoes?

Any echo not derived from clouds or precipitation

15

What are the 3 types of extraneous echoes?
SAC

Second trip echoes
Angel echoes
Clutter

16

How many RADAR sites are there in Canada and what band and cm wavelength are they?

31
C-band
5 cm

17

What are the three factors that affect the return power of RADAR targets?
NCS

Number of drops or flakes
Composition (liquid or solid)
Size