Cable Splitters Only use antenna splitters where a secondary receiver is connected or planned. DC block the splitter to the secondary receiver. Record splitters in the station site log and metadata. Lightning Include a grounded lightning protector in the antenna cable, Protection especially in lightning prone areas. In lightning prone areas, reduce the horizontal cable-run length to minimise the risk of signal induction from nearby lightning strikes. If this is not possible, fit the lightning arrestor toward the receiver end of the cable. Cable Type Use an antenna cable type sufficient for the length of the intended cable run between antenna and receiver. The selected cables and components should have a total signal loss of less than 9 dB over the length of the cable run. Meteorological and other sensors Meteorological data aids understanding the CORS ambient environment and assists GNSS processing and the development of improved weather models. Other sensors that may be included at CORS sites include cameras, sunlight sensors to monitor solar performance, and security equipment such as motion sensors. External dedicated meteorological sensors are required at Tier 1 and 2 CORS sites to provide a continuous meteorological record at the site. Install meteorological sensors separately from the CORS monument to minimise any increase in the multipath environment. RINEX may be used to record and transmit meteorological data. Survey the position of all auxiliary sensors for inclusion in the site logs and metadata. Meteorological sensors at CORS sites have the following requirements: pressure measurement accuracy better than ± 0.5 hPa; temperature measurement accuracy better than ± 1° C; relative Humidity measurements better than ± 2%; and The height difference between the pressure measurement reference mark of the meteorological sensor and the CORS reference point should be determined to better than 10 millimetres.
Cable Splitters Only use antenna splitters where a secondary receiver is connected or planned. DC block the splitter to the secondary receiver. Record splitters in the station site log and metadata. Lightning Protection Include a grounded lightning protector in the antenna cable, especially in lightning prone areas. In lightning prone areas, reduce the horizontal cable-run length to minimise the risk of signal induction from nearby lightning strikes. If this is not possible, fit the lightning arrestor toward the receiver end of the cable. Cable Type Use an antenna cable type sufficient for the length of the intended cable run between antenna and receiver. The selected cables and components should have a total signal loss of less than 9 dB over the length of the cable run. Meteorological and other sensors Meteorological data aids understanding the CORS ambient environment and assists GNSS processing and the development of improved weather models. Other sensors that may be included at CORS sites include cameras, sunlight sensors to monitor solar performance, and security equipment such as motion sensors. External dedicated meteorological sensors are required at Tier 1 and 2 CORS sites to provide a continuous meteorological record at the site. Install meteorological sensors separately from the CORS monument to minimise any increase in the multipath environment. RINEX may be used to record and transmit meteorological data. Survey the position of all auxiliary sensors for inclusion in the site logs and metadata. Meteorological sensors at CORS sites have the following requirements: pressure measurement accuracy better than ± 0.5 hPa; temperature measurement accuracy better than ± 1° C; relative Humidity measurements better than ± 2%; and The height difference between the pressure measurement reference mark of the meteorological sensor and the CORS reference point should be determined to better than 10 millimetres.
Guideline-for-Continuously-Operating-Reference-Stations_v2.1.docx