SECTION 5 - GENERAL THEORY OF OPERATION
5.2
Antenna Operation
: The Transceiver Module MSPA
transmit array of patch elements convert electrical current
from a dielectric resonator oscillator (DRO) to linear
polarized (LP) electro-magnetic (EM) energy. The MSPA
receive array of patch elements convert LP EM energy to
electric current fed to a Low Noise Amplifier (LNA).
Antenna Specification
: The Transceiver Module is
specified at +5VDC, CW operation, 12k ohm load, and
+25C. Maximum Radiated Power and Spurious Emission
are +20dbm and -30dbm respectively. Typical 3db
Antenna Beam-widths are 12 degrees Azimuth and 24
degrees Elevation. Typical Antenna Side-lobes and
Sensitivity are -18dbm and -110dbm respectively. The
total Transceiver Module weight is 75gm typical.
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 in the PATROL window.
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 speeds in the
PATROL window 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.
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