Description - GTT Opticom GPS System Installation Manual

Intersection Equipment Installation Instructions

3 Description

This section provides a general description of the
Opticom™ GPS system and a detailed description
of the intersection equipment.
Opticom GPS System
The Opticom GPS system assists authorized
priority vehicles through signalized
intersections by providing temporary right-of-
way through the use of common traffic
controller functions.
The Opticom GPS system consists of the
following matched components:
Vehicle Equipment —
•
Radio/GPS unit containing a GPS receiver and
a 2.4 GHz transceiver
•
Radio/GPS antenna
•
Vehicle Control unit
Intersection Equipment —
•
A traffic pole mounted Radio/GPS unit
containing a GPS receiver with antenna and a
2.4 GHz transceiver with antenna (Model
1010)
•
Or a Traffic Cabinet mounted Radio/GPS unit
containing a GPS receiver and a 2.4 GHz
transceiver (Model 1012)
•
Radio/GPS antenna (Model 1050)
•
Phase Selector (Model 1000)
•
Card Rack/Input File (Model 1040)
•
Auxiliary Interface Panel (Model 1030)
•
Green Sense Harness (Model 1035)
The vehicle equipment is mounted on the
priority vehicle. Its GPS receiver acquirers
position information from the constellation of
GPS satellites. This information is used to
compute the location, speed, and heading of
the vehicle. This information, along with a
priority request and the state of the vehicles
turn signal, is broadcast using the 2.4 GHz
transceiver.
The intersection equipment receives the radio
transmission from the vehicle equipment. The
intersection equipment then compares the
information being received from the vehicle to
the parameters stored in the intersection
equipment's memory. If the vehicle is heading
toward the intersection in a predefined approach
corridor, is requesting preemption and has met
all other programmed parameters, the
corresponding phase selector output is activated.
This output is connected to the traffic controller
preemption input. When activated, the
controller cycles to grant a green light to the
requesting vehicle or holds the green allowing
the vehicle to pass through the intersection.
The card rack/input file provides the power and
logic wiring for the phase selector, which plugs
directly into a slot in the unit.
The auxiliary interface panel provides additional
connection for monitoring green phases and also
provides additional priority control outputs.
The auxiliary harness can be used to provide
additional connection for monitoring green
phases when the auxiliary interface panel is not
required.
9