4 GPSW SVN-49 Information_25Jan2010 SVN-49 (PRN-01) Continued Current Status SVN-49 set unhealthy but still operated as part of GPS constellation Cont
{"Image DocumentName": "SVN-49 (PRN-01) Continued Current Status", "Image ImageDescription": "SVN-49 set unhealthy but still operated as part of GPS constellation. Control segment parameters temporarily adjusted to allow 2SOPS to continue to include SVN-49 in operational constellation (152 meter antenna phase center offset) Will permanently modify Kalman Filter to accommodate SVN-49 without impacting users. GPSW and 50 SW exploring additional mitigation steps and eliciting user feedback. Potential mitigation steps include. Increase SVN-49 User Range Accuracy (URA) \u2013 change bits in GPS data message that allow user equipment to de-weight or exclude SVN-49 signals. Change SVN-49 PRN code to one outside range used by current user equipment. Modify SVN-49 signal configurations to mitigate impact to high precision users. Leave vehicle unhealthy but usable by some users by adjusting bits in nav message.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}