User's Manual

SECTION 5—GENERAL THERORY OF OPERATION
5.4
Target Doppler Signal : Upon receiving the "target"
Doppler signal, the processing unit automatically computes
the difference between the speed of the patrol vehicle and
the target vehicle. The speed of the approaching vehicle is
then displayed as the Target speed. If, for example, a patrol
vehicle is traveling 55 MPH and an approaching vehicle is
traveling 65 MPH, the Raptor RP-1 would process the
groundspeed of 55 MPH and the combined speed of 120
MPH. The DSP would subtract the patrol speed from the
combined speed (120 - 55 = 65). The Patrol would display
55 and the Target would display 65.
Moving Same Direction Mode : In the moving same
direction mode of operation, the target Doppler is received
from a target traveling in the same direction as the patrol
vehicle. These "groundspeed" Doppler and the
"difference" Doppler signals are received and sent to the
DSP. The Difference Doppler is the speed difference
between the patrol vehicle and a vehicle traveling in the
same direction. The Raptor RP-1 uses its directional
determination capabilities to automatically determine if the
target vehicle is traveling faster or slower than the patrol
vehicle. The unit will display the patrol speed then
automatically add or subtract the "difference" speed to the
patrol speed for the target speed.
If the patrol vehicle's speed was 55 mph and a target was
traveling in the same direction at 70 mph, the Raptor RP-1
would display 55 as the Patrol then add the "difference”
Doppler signal (15) to the patrol speed (55 + 15 = 70) and
display 70 as the Target.