structure specification contained in the Road Cadastre standard. 4. RELATED TESTS AND RESEARCH Figur
Some working tables are added, containing the trajectographic
solutions, the pointer to images, the photogrammetric raw 4.4 DGPS by DARC transmission Rip
measurements, the raw axis data and so forth. 5000
In this way, generating a GDF ASCII file is a straightforward The DARC (Data Radio Channel) system was born by a 8500
process as to generate some other formats (i.e. a measured collaboration between the Japanese NHK and the Swedish pe
polyline shapefile which can be used to display the road Teracom; in Europe it is known as SWIFT-DARC (System for m
network and the segmented attributes in a GIS environment). Wireless Infotainment Forwarding and Teledistribution), and is uf
6500 |
an ETSI standard.
6000 7
"
n° Peas surement
X
+ ec
5500 |
distanza misurata (mm)
| The instrumentation to implement the system consists on an |
| encoder, to be set in an FM transmitting station, a dedicated PC e
running the necessary software, one or more receivers.
In this way it is possible to transmit DGPS corrections on the
side band of a common FM transmission without any disturb on
normal programs. These corrections can be received in real time
4500
Part Seen
4000
by any dedicated receiver on all of the particular FM frequency
coverage area. The rc
We have successfully tested the system in the areas of Trieste level. 1
and Gorizia, thanks to the kind collaboration of Radio Punto ?
I Zero, a private local radio source. exacts
: > S 43 Fi
Using the DARC system we are also testing additional data
transmission, useful in real time information on traffic and road We h:
Figure 3. Dataset rendering in Arcview GIS practicability conditions. princip
4.2 LDM Test Range:
3. THE SMALLER VAN
We tested the repeatability of the response given in operative
A. cross-country motor vehicle (Fiat Panda 4x4 van) has been Conditions by a SOKKIA MiNi Meter MM30/30R. Its intended Sinsie
equipped with a low-cost navigational GPS + monoaxial Inertial ~~ employment is in aiding photogrammetric restitution. uai
Navigation System (odometer and gyroscope) by the Pisa Instrumental characteristics are given below.
University unit. This system is a Placer GPS DR 455DR, which Some
characteristics are given below: employ
eo 8 channel DGPS receiver scannir
e piezoelectric solid state gyro for dead reckoning high er
e standard RS232 in/out to dete
In output we have: position, speed, heading and time data (every
1 second).
A low cost color digital camera is part of the van equipment.
The researching activity carried out now is aimed to survey road
axis in zones with numeric cartography, to record GPS+INS
data in order to study system accuracy and repeatability in urban
and extra-urban environment.
This vehicle has the main task of updating the RIS for : :
maintenance and emergencies. Figure 5. LDM Test Mounting
This vehicle can also be employed in surveying adding specific
environmental sensors (e.g. atmospheric pollution sensors, ai. N
electromagnetic sensors...), in order to produce thematic maps. aa HR d
time second (
‚001m The str
Class 2 angle 1
ater resistance X7, [with connector shown
d as state
uous use 850 measurements [at 30-second intervals
time 70 minutes. Battery refresh function rided.
minutes after
with battery
Table 6. SOKKIA MM30/30R instrumental characteristics
An RS 232 serial port permits the connection to a PC, to log
collected data, and to be synchronised with all the MMS
recorded data.
Figure 4. The vehicle equipped at the University of Pisa
184
