NCGS

Geodetic News


FAA issues notice of GPS interference testing
Monday, October 12, 2020

The Federal Aviation Administration (FAA) has issued the following notice of GPS interference testing that may result in unreliable or unavailable GPS signal:

FLIGHT ADVISORY: GPS Interference Testing
FORT BRAGG NORTH CAROLINA (FTBRNC) 20-29
11 – 16 October 2020 / Ft. Bragg, NC

This test will be centered at 35.139444°, -79.163333° and extend outward and upward like a narrow test tube affecting the GPS signal 27 Nautical miles (NM) away at 50 ft above ground elevation (AGL) relative to the center point’s (CP’s) ground elevation (~300 ft mean sea level or MSL) plus the height of the broadcasting antenna, 30 NM away at 4,000 ft AGL, 30 NM away at 10,000 ft MSL, and so on. These tests will be conducted daily 0601 Z - 2359 Z (2:01 am EDT - 7:59 pm EDT) with the following caveat: “Each event may last the entire requested period.”

The FAA does not provide an affected radius figure of interest to remote pilots for 400 ft AGL. Based on the notice’s data, NCGS estimates this radius to be 28 NM. Due to the steepness of this curve, NCGS recommends adding a 5 NM buffer for any low altitude UAV ops and a 10 NM buffer for any UAV ops near 400 ft AGL.

Please note that the testing centered at Fort Bragg will be encompassed by the testing near Ivanhoe, NC, but the testing near Ivanhoe will be conducted at night [0000 Z - 0600 Z (8:00 pm EDT – 2:00 am EDT)].


FAA issues notice of GPS interference testing
Monday, October 12, 2020

The Federal Aviation Administration (FAA) has issued the following notice of GPS interference testing that may result in unreliable or unavailable GPS signal:

FLIGHT ADVISORY: GPS Interference Testing
MARINE SPECIAL OPERATIONS COMMAND (MARSOC) 20-04
11 October – 02 November 2020 / Ivanhoe, NC

This test will be centered at 34.648611°, -78.298333° and extend outward and upward like a bowl affecting the GPS signal 69 Nautical miles (NM) away at 50 ft Above Ground Elevation (AGL) relative to the center point’s (CP’s) ground elev (~80 ft mean sea level or MSL), 123 NM away at 4,000 ft AGL, and so on. These tests will be conducted daily 0000 Z - 0600 Z (8:00 pm EDT – 2:00 am EDT) Oct 11 – 15 and Oct 27 – Nov 2 with the following caveat: “Each event may last the entire requested period.”

The FAA does not provide an affected radius figure of interest to remote pilots for 400 ft AGL. Based on the notice’s data, NCGS estimates this radius to be 90 NM. Since this radius is relative to the CP’s ground elevation, the radius needs to be extended by 5 NM for UAV operations at higher ground elevations where the combined ground elevation difference (remote site elevation – CP elevation) + UAV flight elevation approaches or exceeds 600 ft, 10 NM for 880 ft, 15 NM for 1,270 ft, and 20 NM for 1,800 ft. NCGS recommends adding a wide buffer (>10 NM) to any radius figure for operations near 400 ft AGL.

Please note that the testing centered near Ivanhoe will encompass the testing at Fort Bragg, but the testing near Fort Bragg will be conducted later in the day [0601 Z - 2359 Z (2:01 am EDT - 7:59 pm EDT)].


Galileo & BeiDou satellite data now included in NC RTN solution
Tuesday, June 2, 2020

As of today, June 1, 2020, the VRS_CMRx and VRS_RTCM32 mountpoints have been configured to include the Galileo and BeiDou satellite data into the correction solution to NC RTN users. CMRx and RTCM 3.2 are the only versions of the output formats the NC RTN has available for the mountpoints that support the Galileo and BeiDou satellite data. The other mountpoints (VRS_CMRp, VRS_RTCM23, VRS_RTCM3) will still include only the GPS and GLONASS satellite data in the solution. Although the VRS_CMRx and VRS_RTCM32 mountpoints are now configured to include the Galileo and BeiDou satellite data, users may not receive any BeiDou satellite correction data because the NC RTN application can’t process the data from the latest BeiDou satellites (BeiDou-3) yet.


Please update your NCGS website bookmark
Tuesday, November 18, 2019

The NC Geodetic Survey website has undergone some recent back-end changes to enhance security and functionality. If you have not already done so, please update your bookmark for the NCGS page to the URL below.




Geodetic News Archive


Geodetic news items older than approximately 6 months (unless deemed critical) as well as expired GPS interference testing notices can be found on the news archive page at the link below.




Real Time Network Sensor Map


To view the real time network sensor map please visit the link below.

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