Concept
- Technical Information for Concept DVD Speed Measurement
System
LASTEC ConCept is a customer configured speed detection
and enforcement system for use in the tripod mounted
mobile attended mode. For the core of the system it
utilises a Type Approved LTI 20.20 laser speed detection
device and a Type Approved Tele-Traffic Display Control
Unit. The remainder is tailored to the user's requirements.
The system retains all the flexibility and benefits
of the narrow beam laser detection approach, whilst
providing instant pictures at the scene if required
and data capture capable of being processed historically.
The medium used is DVD -R technology which offers greater
flexibility for evidence gathering in speed enforcement.
The
system continues to be uncomplicated in operation but
does require some operator skill. Once mastered it
will provide pictorial evidence of speeding offences
at ranges between 20 & 500m dependent upon the
lens configuration.
SYSTEM DESCRIPTION
Lastec ConCept
Component Parts.
What follows is a brief description of the function
of each piece of equipment in your particular configuration
and these will vary dependent upon customer requirements.
1. THE LASER.
LTI 20.20 UltraLyte 100 Speed Measurement Device
This is the device that measures the speed and distance
to target. It is Type approved within the United Kingdom
for use with the \concept and Lastec systems produced
by Tele Traffic UK Ltd. It is also Type approved for
a large number of Countries throughout the world. It
uses an infrared beam which measures the target vehicle
over 40 times in less than 0.4 of a second. It has
unique error trapping devices within to stop the operator
obtaining spurious readings.
2. DISPLAY CONTROL UNIT (DCU)
The Display Control Unit (or
DCU) is the vital piece
of equipment that links the live pictures obtained
by the Digital Camera to the data provided by the LTI
20.20 Ultralyte speed measuring device. Additionally
it generates the data and cross hairs that appear on
the live video picture.
It allows the Operator to set a threshold speed limit
below which speed enforcement is not required.
Having captured the data it will mark the DVD recorded
images both visibly and invisibly in a format that
is recoverable.
The Operator has the ability to locate the displayed
data anywhere on the screen and to move and adjust
the cross hairs for size and shape.
For each transaction the DCU conducts a sixteen bit
check sum with the LTI 20.20 Ultralyte
Laser to verify
the data before it is displayed and should verification
not take place for any reason the unit will display
an appropriate error message.
3. VIDEO CAMERA
The choice of Video Camera depends largely on the
requirement for the particular application. We provide
a JVC KY-F550 A high resolution three chip CCD Colour
Camera for high definition and picture quality is integrated
into the system. This camera provides 800 lines of
Broadcast quality digital real time video at 25 frames
of 50 fields per second. It also has the capability
to operate in low light conditions down to as low as
1 lux.
4. LENS
Once again the choice of Lens is a matter for customer
requirements and the operational environment in which
it is intended to be used. The equipment is capable
of being used with a variety of Lenses and there is
no reason why Operators cannot have a range of Lenses
available for different scenarios.
5. DVD RECORDER/MONITOR
The system uses a Panasonic LQ-MD800 medical grade
DVD –R recorder is configured to PAL/VHS for
optimum performance. It records the processed digital
information from the camera, DCU and the data from
the laser.
There is no direct access to the DVD functions as
these are controlled by pressing the appropriate area
of the camera Monitor. ALL of the Digital recording
Procedure as laid down by the UK Home Office and The
Operating Guidelines by The Association Of Chief Police
Officers is incorporated within the Concept System.
The system produces a secure Write Once Read Many DVD
disc that cannot be altered or amended during its production
or Post completion. The down load of data to the disc
if fully automated and eliminated human error of tampering.
6. POWER PACKS
The equipment is supplied complete with a self contained
12 v DC TELE-TRAFFIC POWERSTATION four outlet rechargeable
capacity.
7. EQUIPMENT CARRYING CASES
The standard configuration includes two Carrying Cases
one of which is hard wired for the DVD
Recorder and
Power Inverter. This simplifies the task of connecting
the equipment for the Operator.
8. CABLES
Each configuration is provided with the necessary
cables to connect the equipment. Whilst care should
always be taken by Operators in making the connections
you will find that they will only fit one way. All
are of the latched type or military specification to
prevent accidental disconnection.
9. TRIPOD
The equipment is operated from a LIBEC
FT 20-J Heavy
Tripod fitted with a LIBEC H37 Fluid Video Head and
LIBEC 2273 Carry Bag.
10. TAPELOGGER
The tape logger works automatically within this system
for fast data transfer to the Event Reader in the back
office procedures.
11. TELE-TRAFFIC EVENT READER (Back
Office Data Download)
Data from each enforcement period is captured onto
DVD Disc for later processing.
The Event Reader will take a signal from a disk and
identify each offence contained upon it. It will then
automatically initiate a print of the picture dependant
on the Back Office system used. It is capable of automatically
downloading that data into all recognised computer
generated ticketing systems.
LASTEC CONCEPT SYSTEM APPLICATION
Having identified each individual module of the Lastec
DVD configuration it will now be helpful to have a
general understanding of how it works together.
Whatever
the LTI 20.20 fitted the system the Operator needs
to be familiar with and aware of all of its functions.
Nothing has changed in that respect and additionally
the skills acquired in operational practise remain
the same.
The Red Dot within the sighting scope is the
operator targeting method and the checks and evidential
requirements of this function are identical when used
with DVD recording equipment.
The data that it provides is also the same and will
still appear on the display on the LTI
20.20 whatever
is connected through the serial port.
The Camera will
give a picture by means of a standard video signal
to whatever equipment it is connected. (The technical
term is 1 volt peak to peak).
When working together the LTI
20.20 and the Camera will provide data and signals to the Display
Control Unit (DCU) and the Tapelogger.
The DCU will firstly perform a 16 bit check sum between
itself and the LTI 20.20 to ensure that the data that
it is receiving has not been corrupted in transmission
by any external source. Should this check not be satisfactory
then an error message (BAD CRC
or RS232) will be generated.
If this check is satisfactory then the data from the LTI
20.20 is inserted by the Display
Control Unit onto
the video signal both visibly and also invisibly in
the form of data marks which are buried in the Digital
recording.
The Display Control Unit will also examine the speed
data provided from the LTI 20.20 and check it against
the threshold speed set by the Operator. If the checked
speed is in excess of the set threshold speed a further
data mark is inserted both visibly and invisibly.
Having merged all this information the Display
Control Unit provides a composite video signal on a loop both
to the DVD Recorder/Monitor.
The video signal on the loop is simultaneously received
by the DVD Recorder/Monitor and recorded on the DVD
disk and in accordance with the comments above provides "best
evidence". The data appears visibly in plain English
and provides:
TIME, DATE, SITE (or OFFICER'S REFERENCE)
SPEED and RANGE TO TARGET
If the target vehicle is above the set threshold speed
then an asterisk will also appear.
The position of the data on the Screen can be controlled
by the Operator.
At the same time, the data is inserted on the DVD
Disk in an invisible form in a technique that resembles
a bar code.
This completes the sequence of events at the scene
but as suggested above it is possible to analyse the
DVD disk in the office situation. This process uses
the Event Reader in conjunction with the Printer and
means that when the video signal is played through
it a search is automatically conducted for data over
the threshold speed and a Video Print produced. This
can be an unattended operation.
Data can be downloaded simultaneously into a Computer
for administrative purposes.
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