Radar/Lidar
ABC's of setting up a radar device refers to:
A: antenna B: box (counting unit) C: current (power source)
The following characteristics of the target will have an effect on the range of the Lidar unit?
ALL OF THE ABOVE
When operating a moving radar the operator should remember:
ALL THE ABOVE
Which of the following will NOT affect the range of radar?
ALL WILL AFFECT RANGE
An approaching vehicle reflects the signal from the radar and it...
Compresses the waves
The following effects may cause erroneous speed indication
Electrical, Mechanical, operational
T/F: A lidar unit uses the Doppler Principles to measure a vehicle's speed.
FALSE
T/F: An automobile with a fiberglass body cannot be detected by a lidar unit.
FALSE
T/F: In addition to the laser beam transmitted by the lidar unit, the unit also "sees" and can detect sunlight and neon lights, but the "speeds" they display are less than 5 mph.
FALSE
T/F: In the case of Lidar, the angular effect could cause the target speed measurement to be higher than the actual speed
FALSE
T/F: It is advisable to sight the lidar unit in on the sun if there are no poles or other suitable objects available.
FALSE
T/F: Lidar units use a lower frequency beam than radar
FALSE
T/F: Operation of a lidar unit through a windshield will affect the accuracy of the device
FALSE
T/F: Radar uses speed as the major determining factor for target selection.
FALSE
T/F: Radar will always display the vehicle closest to the radar
FALSE
T/F: The feedback or scanning affect is possible with all radar sets regardless of design
FALSE
T/F: The word LIDAR stands for Light Doppler and Ranging
FALSE
T/F: Vehicle speed is equal to the elapsed time divided by the distance traveled
FALSE
T/F: You should only test your radar device one a week
FALSE
Traffic radar speed measurement devices determine vehicle speeds by measuring the changes in the signal's:
FREQUENCY
Tracking history has 3 major steps that a radar operator should follow. Which of the following do not belong?
Frequency Range
Optical resonators which create the laser beam use the following two materials
Gallium and arsenide
Tracking History for Lidar: VISUAL OBSERVATIONS
Identify Target, Estimate Speed, Estimate Range, Check Environment (DILF)
Which of the statements is true regarding the frequency of laser beams used for speed measurement?
Laser beams have a higher frequency than radar beams
A LIDAR unit's accuracy is affected by:
NONE OF THE ABOVE
If several vehicles are in range the radar will ALWAYS pick up the speed of the vehicle that is:
NONE OF THE ABOVE
Mechanical interfeance which will provide faulty readings include
NONE OF THE ABOVE
Audio Confirmation (Lidar)
Pitch target acquisition tone
Audio Confirmation
Pitch of Audio Clarity of Audio
In order for the radar operator test to be complete the external Tuning fork test... must be within
Plus or minus one mile per hour
Traffic radar uses
Radio waves
Once transmitted the length of a radar is infinite unless it is
Reflected, absorbed or retracted.
Which of the following is the correct order of priority of the criterion in a radar's decision making?
Reflective capability, position, and speed
Lidar units are examples of this type of laser
Semiconductor laser
Target Speed Confirmation
Steady Readout Consistent with visual estimate Verify patrol speed
Target Speed Confirmation (Lidar)
Steady or multiple Readouts Readout Consistent with visual estimate
T/F: Batching affect occurs if the patrol vehicle has a sudden change in velocity while using moving radar
TRUE
T/F: Lidar units use laser light from the infrared spectrum
TRUE
T/F: The color of a vehicle has an effect on the distance a lidar unit can detect and measure the vehicle speed
TRUE
T/F: The greater potential for error results when the driver is in moving mode
TRUE
T/F: The speed of a lidar signal is always equal to the speed of light.
TRUE
T/F: Tuning forks may be exchanged between different radars in the same band.
TRUE
T/F: a lidar signal's beam length is infinite unless reflected, refracted or absorbed by some object in its path
TRUE
The basic computation of using opposite direction moving radar is
Target speed= closing speed - patrol speed
Consine affect is
a factor that will cause speed readings that are in the motorist's favor
The speed of a laser beam is
equal to the speed of light
The term FREQUENCY is defined as
number of waves transmitted per second
Weather deficiency such as rain or snow tend to _____ radar
reduce
A LIDAR signal's frequency is:
the number of waves set out in one second
TRACKING HISTORY: VISUAL OBSERVATION
(DILF): Identify Target, Estimate Speed, Estimate Range, Check Enviornment
How many cycles per second will k-band radar?
72
T/F: Consine effect can result in a higher than actual rate of speed for a target in moving mode
FALSE
Acronym "radar" stands for what?
Radio Detecting and Ranging
T/F: A radar signal moves at the speed of light
TRUE
T/F: Atmospheric conditions can prevent a lidar unit from measuring a vehicle's speed
TRUE
Angular effect does not become a factor in affecting a speed reading until the angle exceeds approximately ______ degrees
10
What is the operating frequency of k-band radar?
24.15 GHZ
When externally testing a radar device in the moving mode what will the target window read out indicate when you have simultaneously activated a 35 MPH in a 65 MPH tuning fork?
30 MPH
The concept of tracking history evolved from which of the following?
Case Law
T/F: All lidar units are classified as Class 2 laser devices
FALSE
T/F: Moving radar uses two separate transmitters.
FALSE
A Lidar unit will display the target speed of:
The target of the operator's choice