International cooperation and technology transfer

Fras, Mojca Kosmatin

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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:: RTK SURVEY USING COMBINED GPS+GLONASS L1/L2 CARRIER PHASES. Crocetto N. - Gatti M. - Marchesini M. - Negroni F. - Russo P.

Document type:: Monograph

Structure type:: Chapter

• higher number of components of the received signal (Codes and Phases) (Leick et ah, 1998); • decreased times of static initialisation and dynamic re initialisation of the Rover receiver. Position DOP Fig. 2-b. GPS+GLONASS PDOP (from Contreras, 1998). 1. INSTRUMENTATION Fig. 1. GPS+GLONASS satellite constellation on Oct. 14, 1999. Position DOP Fig. 2-a. GPS PDOP (from Contreras, 1998). These new possibilities have permitted the extension of applications of satellite technology, especially to field surveys in which reception of the signal was often impossible with GPS receivers. This paper describes some applications of the RTK technique to combined GPS and GLONASS measurements on carrier phases LI and L2. These experiments involve: • marking out of transverse sections of a road embankment; • localising reference points in woodland for a water supply tunnel. These experiments demonstrate the advantages of GPS+GLONASS in terms of functionality, versatility and ability to operate in areas subject to high levels of disturbance. For the experiments, we used a GPS+GLONASS RTK surveying system composed of: • two field surveyor receivers (Legacy, Javad Positioning System) (Fig. 3) with 40 independent LI channels and 20 L2 channels able to record the GPS and GLONASS signals and to manage internally (with the Paradigm™ chip) the functions of Real Time calculation with firmware 2.0. Fig. 3. The Legacy receiver. The receivers were equipped with 16 MB of RAM memory, which permitted the separate management of storage of the signal (for eventual post-processing) and the functions of RTK calculation. The receivers possessed the JPS suppressor of the internal radio band of the CPU and the function of active CO-OP™ Tracking. This function allows the link of re-acquisition of the signal from Master to Rover with a time of less than 3 milliseconds for all the satellites, temporarily blocked. Each of the 40 main channels of the Paradigm™ chip was also equipped with four Narrow anti-disturbance correlators. In practice, 160 continuous search chips, active in the phase of recording both the GPS and GLONASS signal, provide a 13-fold reduction of the times of static initialisation or dynamic re-initialisation with respect to the times of conventional GPS receivers with 12+12 independent L1+ L2 channels.

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