Rtms Technical Specifications; Microwave Signal And Coverage Area; Accuracy Of Measurement & Error Rates; Accuracy Performance Conditions - Image Sensing Systems RTMS G4 User Manual

Chapter 2

RTMS Technical Specifications

Microwave Signal and Coverage Area

Center Frequency
Bandwidth
Power Output
Beam Width—Vertical (Elevation)
Beam Width—Horizontal (Azimuth)
Side Lobes
Range
Number Of Detection Zones And Lanes
Accuracy of Measurement & Error Rates
Measurement
Per Lane Volume—Side-Fired
Volume Range
Per Lane Occupancy—Side-Fired
Occupancy Range & Resolution
Per Lane Classification By Length (6 classes)
Class Lengths Limits range and resolution
Average Per Vehicle Speed—Side-Fired
Speed range and resolution
Resolution of time events
Voltage readout resolution

*Accuracy Performance Conditions

Error performance parameters outlined above are achieved under normal, high-flow traffic
conditions and are subject to proper installation and setup. Lower accuracy is expected under
the following conditions:
•
Low speed, high congestion conditions: The RTMS tends to over-count under very low
speed conditions (below 1 mph).
•
Improper selection of installation site: insufficient set-back, height beyond the
recommendation, obstruction by barriers or high fences before monitored lanes.
•
Improper fine tune setting for the road geometry (lane width, barriers, etc.) will result in
"splashing" and, therefore, over-counting.
•
In Forward-Looking Hwy configuration the following conditions may result in errors:
−
High variance between the volumes in the speed trap zone.
−
Improper aiming, mounting height (too high) or incorrect offset parameters
−
Obstructions within the trap range.
G4 User Manual
Model K4
24.125 GHz
50 MHz
10mW
50°
12°
>-20dB
2-75 Meters (6-250 feet)
12
% Error *
5%
0-65535
5%
0-100%, 0.1%
10%
100ft., 1ft.
10%
0-180km/h (110 MPH), 1 MPH
1.25mS
0.1v
© 2009 ISS Canada
RTMS G4 Installation
2-13