Automatic Precise Positioning Service

APPS is powered by NASA JPL's Global Differential GPS (GDGPS) System, a complete, highly accurate, and extremely robust real-time GNSS monitoring and augmentation system.

What is GDGPS?

Employing a large ground network of real-time reference receivers, innovative network architecture, and real-time data processing software, the GDGPS System provides sub-decimeter (<10 cm) positioning accuracy and sub-nanosecond time transfer accuracy anywhere in the world, on the ground, in the air, and in space, independent of local infrastructure.

A complete array of real-time GNSS state information, environmental data, and ancillary products are available in support of GNSS Augmentation operations, Assisted GNSS (A-GNSS) services, situational assessment, and environmental monitoring — globally, uniformly, accurately, and reliably.

Multi-Constellation Support

Full services are available for:

• GPS - United States Global Positioning System
• GLONASS - Russian Global Navigation Satellite System
• Galileo - European Global Navigation Satellite System
• BeiDou - Chinese Navigation Satellite System
• QZSS - Japanese Quasi-Zenith Satellite System
• NAVIC - Indian Regional Navigation Satellite System

Proven Track Record

GDGPS has been providing high reliability position, navigation, and timing data services to industry and government operations since 2000. The GDGPS navigation technology underlies major global infrastructure, including:

• Wide Area Augmentation System (WAAS) - Aviation safety system
• former GPS Operational Control Segment (OCX) - GPS ground control
• NASA Space Missions - Supporting spacecraft navigation and Earth science

The GDGPS Network

The GDGPS System operates one of the world's largest real-time GPS tracking network with over 180 globally distributed reference stations. This extensive network ensures worldwide coverage and redundancy for maximum reliability.