Basic Principles of RADAR Speed Measurement Flashcards
What does RADAR stand for?
Radio Detection and Ranging
The first use of RADAR in America was around _______.
1941
Development of RADAR occurred between 1935 and 1937 in England and was headed by ___________________________.
Alexander Watson-Watts
The ____________ begins at the top of the wave peak and stops where the wave valley ends at the
next wave peak.
wavelength
The _______________ of the wave is the maximum extent of the oscillation from the base line or power
of the wave.
amplitude
The _______________ of the signal is the number of waves that pass a given point in a given time frame.
frequency
The speed of the
RADAR beam is equal to the _______________.
speed of light.
The speed of light is ______________ miles per second.
186,000
Wavelength multiplied by
frequency is equal to the ________________.
speed of light
Wavelength X Frequency =
_________________
Speed of Light
______ signal always travels at the speed of light.
RADAR
What are the 3 main bands of RADAR employed for speed Enforcement?
- X Band RADAR
- K Band RADAR
- Ka Band RADAR
X Rand was an early version. The speed RADAR had a frequency of __________ Gigahertz.
10.525
The broadcast wavelength for X Band RADAR’s broadcast wavelength is _____ inches.
1.2
K Band RADAR broadcasts at a frequency of _________ Gigahertz or 24,150,000,000 waves per second.
24.150
The broadcast wavelength is ____ inches for K Band RADAR.
.5
Ka Band RADAR is a newer version than the K Band. It broadcast frequencies between ________ and ______ Gigahertz.
33.4 and 36
Ka Band RADAR’s wavelength is approximately ______ inches.
.375
___________ _____________ is the calculation made when the motion of a moving object is judged based on observation or calculation from another moving object.
Relative motion
> Separation and closing speed differences
__________ ________________ developed the Doppler Principle as a way to explain the color of the stars he saw.
Christian Doppler
__________ ______________ explains that the number of RADAR waves that reflect off a target object changes in proportion to the relative speed of the target.
Doppler Principle
The RADAR’s Audio Doppler feature produces what two pieces of information?
- Assists in identifying sources of interference
- Provides evidence of speeding
What are two main portions of the RADAR beam?
- Central Core (80% of transmitted signal)
- Side lobes (20% of transmitted signal)
Traffic RADAR’s beam is ________ unless acted upon by three things.
infinite
What are the things that can prevent the RADAR’s range from being infinite?
- Reflected back to the RADAR unit
- Refracted back to the RADAR
- Absorbed by a target of environment
__________ is when the beam is bounced off the target.
Reflection
____________ is deflected by the target.
Refraction
