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Doppler shift is proportional to the relative velocity between the radar and the passing reflecting objects, the Doppler shift
of this signal will be proportional to the speed of the patrol vehicle. The second signal, closing speed, results from the
radar signal reflecting from an approaching or retreating opposite lane moving target and then returning to the patrol
vehicle. The Doppler shift of this signal will be proportional to the sum of the patrol speed and target speed, or closing
speed. To determine the target speed, S
of this signal will be proportional to the speed of the patrol vehicle. The second signal, closing speed, results from the
radar signal reflecting from an approaching or retreating opposite lane moving target and then returning to the patrol
vehicle. The Doppler shift of this signal will be proportional to the sum of the patrol speed and target speed, or closing
speed. To determine the target speed, S
PATROL
subtracts the patrol speed from the closing speed.
Same Lane Moving Mode -
In same lane moving mode, two (2) signals must be processed to determine target speed.
The first signal, patrol speed, results from the radar signal reflecting from passing stationary objects. Since the Doppler
shift is proportional to the relative velocity between the radar and the passing reflecting objects, the Doppler shift of this
signal will be proportional to the speed of the patrol vehicle.
shift is proportional to the relative velocity between the radar and the passing reflecting objects, the Doppler shift of this
signal will be proportional to the speed of the patrol vehicle.
The second signal, difference speed, results from the radar signal reflecting from an approaching or retreating same lane
moving target and then returning to the patrol vehicle. The Doppler shift of this signal will be proportional to the
difference speed between the patrol and target vehicles. If the target vehicle is moving faster than the patrol vehicle and
the faster mode is selected (default), the difference speed will be added to patrol speed to obtain target speed. If the target
vehicle is moving slower than the patrol vehicle, SLOWER option should be selected. In this case, the difference speed
will be subtracted from the patrol speed to obtain target speed. For more detailed information, see the section on SAME
LANE THEORY, page 14.
moving target and then returning to the patrol vehicle. The Doppler shift of this signal will be proportional to the
difference speed between the patrol and target vehicles. If the target vehicle is moving faster than the patrol vehicle and
the faster mode is selected (default), the difference speed will be added to patrol speed to obtain target speed. If the target
vehicle is moving slower than the patrol vehicle, SLOWER option should be selected. In this case, the difference speed
will be subtracted from the patrol speed to obtain target speed. For more detailed information, see the section on SAME
LANE THEORY, page 14.
Faster Mode -
S
PATROL
offers Faster Speed Tracking. Fast Speed Tracking is a field selectable feature and
can be easily disabled, if desired.
The addition of the faster mode allows the ability to track small high speed targets that normally could not be tracked
because a stronger target shields the weaker target from normal speed measurement. The classic example is where a
speeding sports car passes a slower moving eighteen wheeler: The faster sports car, although clearly speeding, previously
could not be measured because the strongest truck target captures the target display window. S
because a stronger target shields the weaker target from normal speed measurement. The classic example is where a
speeding sports car passes a slower moving eighteen wheeler: The faster sports car, although clearly speeding, previously
could not be measured because the strongest truck target captures the target display window. S
PATROL
, in this
example, will display the speed of the strongest truck in the target window, while the speed of the faster sports car will
appear in the middle faster window. Tracking of both targets may be performed simultaneously. (See page 13.)
appear in the middle faster window. Tracking of both targets may be performed simultaneously. (See page 13.)