International cooperation and technology transfer

Fras, Mojca Kosmatin

Bibliographic data

Monograph

Persistent identifier:: 856490555

Author:: Fras, Mojca Kosmatin

Title:: International cooperation and technology transfer

Sub title:: Ljubljana, Slovenia, February 2 - 5, 2000 : proceedings of the workshop

Scope:: VI, 163 Seiten

Year of publication:: 2000

Place of publication:: London

Publisher of the original:: RICS Books

Identifier (digital):: 856490555

Illustration:: Illustrationen, Diagramme

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: HIGHWAY SURVEYING WITH DGPS BASED ON RTCM SATELLITE CORRECTIONS. S. COSSI, M. MARSELLA, C. NARDINOCCHI, L. TOMBOLINI

Document type:: Monograph

Structure type:: Chapter

34 Figure 3 TEST 2: Vehicle Trajectory obtained from the DGPS in post-processed survey The MASTER station for differentially processing data collected by the ROVER receiver (Pro XR) was situated at a distance of about 2 kilometres from the test-area. The raw data were processed using the PathFinder Office package. The displacement that was observed between two repeated tracks resulted to be within 2 meters; this value can be addressed both to positional errors and to normal route deviations. As expected, while passing by the urban area many interruptions are present in ROVER data resulting a segmented trajectory (Figure 3). 3.3 TEST 3: Performance of RTCM satellite transmitted correction The test was carried along several kilometre of the highway RM-AQ (Figure 4). This time the vehicle was equipped with a Pro XRS receiver, capable of receiving in real time the RTCM- 104 satellite transmitted correction (via OMNISTAR). While running on the highway, the vehicle proceeded twice over the same route in both directions: the first time running at a speed of 60-80 km/h on the right lane and the second time at 120 km/h on the take-over lane. All the resulting trajectories showed a good level of overlap, with the exception of a major divergence visible in the northeast end of the trajectory (Figure 4). This effect was caused by a defective transmission cable and resulted in a displacement that reached the magnitude of 30-40 meters in 70 epochs. In figure 5, a detail of the trajectories is shown. Figure 4 TEST 3: Vehicle Trajectory obtained from the Post processing Differential GPS highway survey Figure 5 TEST 3: Particular of the Vehicle Trajectory obtained from the Post-processing Differential GPS highway survey 4 SURVEY WITH A DEDICATED VEHICLE This test was carried out with a vehicle adopted for highway survey by the Società Autostrade. A path of 20 kilometres along the Al highway was covered many times back and forth. The speed of the vehicle was about 60 -s- 70 kilometres per hour as in a standard operational environment. The test area was chosen on the basis of different characteristics: the proximity with the operating base of the Società Autostrade in Fiano Romano, where the MASTER station was located; the continuos presence of a suitable emergency lane. In order to establish a number of reference points, 21 marks were painted on the ground along the emergency lane in correspondence of kilometre road signs (Figure 6). Inside the vehicle two receivers were collecting data during the test: the Pro XR/XRS and the 4700 Trimble receivers. The first one was used either in RTCM-104 mode or in Post Processing mode. The 4700, a double frequency receiver with a sub centimetre accuracy, was used to compute reference values to estimate the accuracy of the Pro XR/XRS positioning. Furthermore the positional data measured by the odometer in the form of mile chainage, were compared with that one derived from the GPS co-ordinates. On the roof of the vehicle, equipped with a high quality odometer, two GPS antennas were mounted (Figure 7).

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