Section 5—General Theory of Operation
5.1
5. GENERAL THEORY OF OPERATION
5.0 GENERAL
The Directional Golden Eagle II moving radar system
transmits a Ka-Band radio frequency in compliance with the
Federal Communications Commission (FCC) regulations.
A portion of the transmitted signal strikes the surface of the
roadway and surrounding terrain and reflects back to the
antenna. The returning signal is the "groundspeed"
Doppler. From the antenna, it travels to the Digital Signal
Processing (DSP) where the signal is translated to the speed
of the patrol vehicle (groundspeed) and is displayed in the
PATROL display.
The Eagle II series has an exclusive feature from Kustom
Signals 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 speeds in the PATROL window
when stopped at a traffic light or sign.
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 counting unit measures this speed of
convergence, or combined speed.
Upon receiving the "target" Doppler signal, the counting
unit automatically computes the difference between the
speed of the patrol vehicle and the target vehicle. The speed
of the approaching vehicle registers in the TARGET
display. If, for example, a patrol vehicle is traveling 55
MPH and an approaching vehicle is traveling 65 MPH, the
Directional Golden Eagle II would process the groundspeed
of 55 MPH and the combined speed of 120 MPH. The DSP
would subtract the patrol speed from the combined
