Description - OPTICOM 764 Installation Manual

2 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 Components
•
Radio/GPS unit containing a GPS receiver and a 2.4 GHz transceiver
•
Radio/GPS antenna
•
Vehicle Control unit
Intersection Equipment Components
•
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) with a Radio/GPS antenna (Model 1050)
•
Phase Selector (Model 764)
•
Card Rack/Input File (Model 760)
•
Auxiliary Interface Panel (Model 768)
Operation Description
The vehicle equipment is mounted on the priority vehicle. Its GPS receiver acquires 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, ID information 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 outputs.
Intersection Equipment Installation Instructions
7