Where fixtures do not entirely penetrate a foundation wall, use ChemSetTM stainless steel bolts penetrating at least half the wall width. Ensure that sufficient safety provisions (harness points, ladder brackets etc.) are available for personnel installing or maintaining roof mounted monuments and equipment. Figure 6 shows examples of Tier 3 bracketed, post, and post and stay CORS antenna monuments (courtesy Department of Sustainability and Environment, Victoria, Department of Natural Resources and Mines, Queensland, and Land and Property Information New South Wales). CORS Additional information on CORS antenna monuments is available from the resources: IGS Monumentation Design and Implementation Web page, available from: NGS National Continuously Operating Reference Station Monumentation Process Action Final Report, available from: UNAVCO Knowledgebase – GNSS Station Monumentation Web page, available from: Figure : Sample Tier 3 CORS monuments Antenna mounts The antenna mount connects the GNSS antenna to the monument. Once installed the antenna mount should lock the antenna in place so it cannot move or rotate. When an antenna is removed and replaced, the mount should return the antenna reference point to the same location and orientation. The antenna mount must maintain a level antenna, oriented to within 5° of true north for antenna calibrations to be effective. Using thin shims or washers allow the antenna to be oriented to true north, but will introduce a height of antenna that must be carefully communicated to data consumers to allow accurate positioning. Figure 7, Figure 8 and Figure 9 show some example CORS mounts. A survey tribrach is not considered an acceptable antenna mount.
Where fixtures do not entirely penetrate a foundation wall, use ChemSetTM stainless steel bolts penetrating at least half the wall width. Ensure that sufficient safety provisions (harness points, ladder brackets etc.) are available for personnel installing or maintaining roof mounted monuments and equipment. Figure 6 shows examples of Tier 3 bracketed, post, and post and stay CORS antenna monuments (courtesy Department of Sustainability and Environment, Victoria, Department of Natural Resources and Mines, Queensland, and Land and Property Information New South Wales). CORS Additional information on CORS antenna monuments is available from the resources: IGS Monumentation Design and Implementation Web page, available from: NGS National Continuously Operating Reference Station Monumentation Process Action Final Report, available from: UNAVCO Knowledgebase – GNSS Station Monumentation Web page, available from: Figure : Sample Tier 3 CORS monuments Antenna mounts The antenna mount connects the GNSS antenna to the monument. Once installed the antenna mount should lock the antenna in place so it cannot move or rotate. When an antenna is removed and replaced, the mount should return the antenna reference point to the same location and orientation. The antenna mount must maintain a level antenna, oriented to within 5° of true north for antenna calibrations to be effective. Using thin shims or washers allow the antenna to be oriented to true north, but will introduce a height of antenna that must be carefully communicated to data consumers to allow accurate positioning. Figure 7, Figure 8 and Figure 9 show some example CORS mounts. A survey tribrach is not considered an acceptable antenna mount.
Guideline-for-Continuously-Operating-Reference-Stations_v2.1.docx