Basic Principles of RADAR Speed Measurement

Question 1

What does RADAR stand for?

Answer 1

Radio Detection and Ranging

Question 2

The first use of RADAR in America was around _______.

Answer 2

1941

Question 3

Development of RADAR occurred between 1935 and 1937 in England and was headed by ___________________________.

Answer 3

Alexander Watson-Watts

Question 4

The ____________ begins at the top of the wave peak and stops where the wave valley ends at the
next wave peak.

Answer 4

wavelength

Question 5

The _______________ of the wave is the maximum extent of the oscillation from the base line or power
of the wave.

Answer 5

amplitude

Question 6

The _______________ of the signal is the number of waves that pass a given point in a given time frame.

Answer 6

frequency

Question 7

The speed of the
RADAR beam is equal to the _______________.

Answer 7

speed of light.

Question 8

The speed of light is ______________ miles per second.

Answer 8

186,000

Question 9

Wavelength multiplied by
frequency is equal to the ________________.

Answer 9

speed of light

Question 10

Wavelength X Frequency =
_________________

Answer 10

Speed of Light

Question 11

______ signal always travels at the speed of light.

Answer 11

RADAR

Question 12

What are the 3 main bands of RADAR employed for speed Enforcement?

Answer 12

1. X Band RADAR
2. K Band RADAR
3. Ka Band RADAR

Question 13

X Rand was an early version. The speed RADAR had a frequency of __________ Gigahertz.

Answer 13

10.525

Question 14

The broadcast wavelength for X Band RADAR’s broadcast wavelength is _____ inches.

Answer 14

1.2

Question 15

K Band RADAR broadcasts at a frequency of _________ Gigahertz or 24,150,000,000 waves per second.

Answer 15

24.150

Question 16

The broadcast wavelength is ____ inches for K Band RADAR.

Answer 16

.5

Question 17

Ka Band RADAR is a newer version than the K Band. It broadcast frequencies between ________ and ______ Gigahertz.

Answer 17

33.4 and 36

Question 18

Ka Band RADAR’s wavelength is approximately ______ inches.

Answer 18

.375

Question 19

___________ _____________ is the calculation made when the motion of a moving object is judged based on observation or calculation from another moving object.

Answer 19

Relative motion

> Separation and closing speed differences

Question 20

__________ ________________ developed the Doppler Principle as a way to explain the color of the stars he saw.

Answer 20

Christian Doppler

Question 21

__________ ______________ explains that the number of RADAR waves that reflect off a target object changes in proportion to the relative speed of the target.

Answer 21

Doppler Principle

Question 22

The RADAR’s Audio Doppler feature produces what two pieces of information?

Answer 22

1. Assists in identifying sources of interference
2. Provides evidence of speeding

Question 23

What are two main portions of the RADAR beam?

Answer 23

1. Central Core (80% of transmitted signal)
2. Side lobes (20% of transmitted signal)

Question 24

Traffic RADAR’s beam is ________ unless acted upon by three things.

Answer 24

infinite

Question 25

What are the things that can prevent the RADAR's range from being infinite?

Answer 25

1. Reflected back to the RADAR unit 2. Refracted back to the RADAR 3. Absorbed by a target of environment

Question 26

__________ is when the beam is bounced off the target.

Answer 26

Reflection

Question 27

____________ is deflected by the target.

Answer 27

Refraction