RTCA AAM September 12 Workshop Summary


SC-159, Navigation Equipment Using the Global Navigation Satellite System (GNSS)

Established 1985
Home / SC-159

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-ChairChris HegartyThe MITRE Corporation
Co-ChairGeorge LiglerTexas A&M
Government Authorized RepresentativeBarbara ClarkFederal Aviation Administration
SecretaryWes GoogeAmerican Airlines
Program DirectorKaran HofmannRTCA, Inc.

General Information

Terms of Reference
Committee Documents
Next Meeting Agenda
2023 Meetings
July 5, 2023
October 23-27, 2023

Contact Information

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

Join Us

Join the committee in its work. If you are already an RTCA member, the button below will allow you to sign up for the committee. If you are not a member click here to learn about joining.
Join Committee

By submitting this form, you are consenting to receive marketing emails from: RTCA, Inc., 1150 18th Street, NW, Washington, DC, 20036. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact
For more information please visit our Privacy Policy