TS SiteSentry, Руководство пользователя

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teSentry
User Manual of Site Sentry ANPR/Speed Camera System
18
Chapter 4
Adjusting the Radar Sensor continued
4.3.1
The Speed Error Percent Tool
The aim of this tool is to look at a steady stream of speed data being reflected from the
target vehicle being tracked and deem this information to be bonafide - once a general
speed characteristic has been established, the Site Sentry views the reported speed with a
set of intelligent filters, in this case ‘The Speed Error Percent Tool’ which looks at a steady
speed which might be say 10, 10, 11, 12, 11, and then sees a COSINE ‘spike’ of say ‘18'
mph. The software has the ability to identify the rogue reading and switch off the radar
until a reset period has passed or in this case the vehicle has passed.
Cosine effect anomaly reduction
Positive numbers example
22 24 23 8 7 9 8 8 9 10 11 13 15
time
speed
Increase in speed
of a percentage
within a given time
period here
expressed as a
percentage of the
previous ten readings
Average speed to here is 9.8 mph therefore the lift in speed to 23 mph is a 234% rise
a good starting point for this tool is 180% trapping
The next important number is the reset timeout, a good starting point being 300 milliseconds
This being the time period while the radar reporting is ‘blind’ and before the system is re-armed.
click ‘save’ after changing settings