Since being established in 1985, SC-159 has produced and maintained a suite of minimum operational performance standards (MOPS) and minimum aviation system performance standards (MASPS) for aviation equipment using the Global Positioning System (GPS) as augmented by aircraft-based, ground-based, and satellite-based augmentation systems (ABAS, GBAS, and SBAS, respectively) as defined by the International Civil Aviation Organization (ICAO). These standards are in widespread use today but only address equipment that processes one legacy GPS signal – the GPS coarse/acquisition (C/A) code that is modulated on the link 1 (L1) carrier frequency of 1575.42 MHz.

GPS is presently being modernized, and the constellation is being populated with three new civil signals (L5, L2C, and L1C) on multiple frequencies with three of the four end-state civil signals (L1 C/A, L5, and L1C) being located within bands allocated for aeronautical radio-navigation services (ARNS). SBASs, such as the Wide Area Augmentation System (WAAS) in North America, are evolving to support dual-frequency user equipment. Additionally, other GNSS core constellations have been deployed (Russia's GLONASS) or will soon be deployed (Europe's Galileo and China's BeiDou). ICAO's Navigation System Panel (NSP) has already started updating Standards and Recommended Practices (SARPs) contained within Annex 10 to the International Convention on Civil Aviation to incorporate GPS and GLONASS modernization as well as the new core constellations. However, equipment standards are still required.



Co-Chair Chris Hegarty The MITRE Corporation
Co-Chair George Ligler GTL Associates
Government Authorized Representative Barbara Clark Federal Aviation Administration
Secretary  Wes Googe  American Airlines
Program Director Karan Hofmann RTCA, Inc.


General Information

Terms of Reference June 11, 2020
Next Meeting Agenda October 23, 2020
2020 Meetings

March 13, 2020
April 30, 2020
October 23, 2020


Recently Completed Documents

DO-246E Change 1 GNSS-Based Precision Approach Local Area Augmentation (LAAS) Signal-in-Space Interface Control Document (ICD) June 2019
DO-253D Change 1 Minimum Operational Performance Standards for GPS Local Area Augmentation System Airborne Equipment June 2019
DO-373 MOPS for GNSS Active Antenna in the L1/E1 and L5/E5A Bands  June 2018


2019 Meetings March 8, 2019
October 4, 2019
2018 Meetings March 16, 2018
May 3, 2018
October 5, 2018
2017 Meetings May 11, 2017 
October 27, 2017
2016 Meetings March 7-11, 2016
October 14; 17-21, 2016
December 13, 2016
WG-6 Ligado Response
2015 Meetings March 20, 2015
October 19-23, 2015


For additional meeting summaries, please contact the Program Director: Karan Hofmann