User's Manual

SECTION 5—GENERAL THERORY OF OPERATION
5.3
detection, directional phase sensing, and speed processing.
Other peripheral circuits in the processing unit are;
speedometer input, remote control input, and data
input/output. These circuits are not in the I/Q Doppler
signal path. The calculated target speed and direction
information data is sent to the Display unit.
Display Unit Description: The micro-controller in the
display unit receives the data from the processing unit and
displays the information on the graphic LCD. Switch
presses from the front panel are detected by the micro-
controller and are sent to the processing unit. The display
unit also contains a IR detector for the optional IR remote
control and a speaker driver for the Doppler audio signal.
OPERATION DESCRIPTION:
Moving Mode : In moving mode a portion of the
transmitted signal reflects from the surface of passing
stationary objects back to the antenna. This returning
signal is the "groundspeed" Doppler. From the antenna, it
travels to the Digital Signal Processor (DSP) where the
signal is translated to the speed of the patrol vehicle
(groundspeed) and is displayed for the operator to confirm.
Kustom Signals radar has a patented feature using the
patrol vehicle’s speed sensor pulses, which steers the DSP
processor to look for the “groundspeed” Doppler signal in a
specific speed range. This feature will eliminate the often-
annoying anomalies such as shadowing, combined patrol
speeds, splitting speeds, and displaying patrol speed when
stopped at a traffic light or sign.
Moving Opposite Direction Mode : In moving opposite
direction mode, a portion of the transmitted signal strikes
an oncoming vehicle (target vehicle) and returns a Doppler
frequency higher than the groundspeed because the two
objects (patrol vehicle and target vehicle) are converging.
This returning signal is the "target" Doppler. The
processing unit measures this speed of convergence, or
combined speed.