User's Manual

Table Of Contents
Symeo LPR
®
-System
LPR
®
-2DB
Product Documentation
System Description
Copyright © Symeo 2012
Page 23 of 132
3.3.1 Hover-Track
The HoverTrack model is used for vehicles that can move in x- and y-direction but cannot
turn over its center. A typical example is the trolley of a crane. The name based on a
hovercraft which can move forward and backward as well as sideward.
To make a 2D-positioning the mobile unit needs at least one antenna. The usage of a
second, third or fourth antenna results in more robust and more reliable position.
Reference system crane
y
x
(0,0)
center of antenna
Figure 5 HoverCraft model for a trolley
3.3.2 Vehicle-Track
If the object can also turn around its center the vehicle-track model is used. Examples for the
vehicle model are each kind of steerable vehicles (fork lift, van carrier, automobile, etc.). It is
possible to determine besides the 2D position also the orientation of the vehicle. For this it is
at least a second antenna necessary.
reference system forklift
y
x
center of antenna
center of antenna
(0,0)
rear axle front axle
reference system automobile
y
x
center of antenna
center of antenna
(0,0)
front axle
rear axle
Figure 6 Vehicle Model for a forklift and a trolley
3.4 System Design
Each LPR unit (base station, integral station) contains a DSP. For each LPR unit a
configuration file is provided by SYMEO.