The new document from IMCA “Guidelines on installation and maintenance of DGNSS-based positioning systems” (IMCA M 199 / S 012) offers broad guidelines on the installation of global navigation satellite systems (GNSS), including GPS and other satellite systems available such as the GLONASS system. Users of this equipment need to be aware of many technical, procedural and contractual issues before, during and after installation.
The 21-page document covers the basic components of a satellite system and highlights some of the consequences of a poor installation, before going into some detail on the phases of installation. Checklists for pre-installation work are offered, including such matters as antenna location and cable routing.
The installation phase is covered in some detail, particularly the matter of proper location and fitting of antennae and cabling and the possible issues affecting reception of satellite signals, such as multi-path, obscured satellites and interference from other radio sources. There is also information on the below-decks equipment required for GNSS systems and a section on the operational phase, including configuration and calibration of equipment, validation of data and ongoing maintenance.
Further information on IMCA and its publications is available from the IMCA website.