Minimizing GPS Error Range Based on Latitude, Longitude, and Altitude Standards

LG U+ and the National Geographic Information Institute under the Ministry of Land, Infrastructure and Transport signed a 'Memorandum of Understanding for RTK Service Activation' on December 9th to advance the next-generation intelligent transportation system (C-ITS), and have begun technical efforts to explore technology and service cooperation measures.
According to the agreement, both parties will form a working-level consultation group starting January 2020 and begin full-scale discussions on ▲direct linkage of real-time observation raw data ▲RTK service technology testing and sharing ▲satellite-based service and technology development plans, etc.

Through this, the direction is to advance the precision positioning (RTK) technology through a precision map platform (Dynamic Map) and to pursue the evolution of the C-ITS business.

RTK is a technology that secures more accurate location by correcting GPS errors, which can occur up to 30 meters, based on reference stations. It is a method in which error correction information for the position measured by GPS is generated from a reference station with absolute position values such as latitude, longitude, and altitude, and then transmitted to the vehicle.

In autonomous mobile entities, the positioning results are calculated with correction information through an internal RTK reception terminal and utilized in movement paths or driving strategies. RTK is evaluated as a key technology in the autonomous driving industry as it can precisely identify location information down to the centimeter (cm) level, where even minor contact is not tolerated.

Earlier, LG U+ introduced RTK technology to its 5G autonomous driving demonstration project in September.

Kang Jong-o, Executive Director of Future Technology at LG U+, stated, "The key to the future mobility industry depends on how accurately real-time location information can be identified in a communication environment with minimal delay," and added, "We will continue to seek cooperation with major institutions to accelerate the construction of next-generation smart transportation environments such as C-ITS and autonomous driving infrastructure."

Meanwhile, LG U+ completed the construction of nationwide service by applying RTK technology to its internal cloud at the end of July, and is currently focusing on securing substantial information to strengthen the safety of autonomous vehicles.

RTK technology reduces error and improves accuracy as the number of satellites providing information increases. Therefore, the RTK server built by LG U+ supports all available satellites from the United States, Russia, Europe, China, and Japan. Additionally, the company is testing DR functionality based on inertial measurement sensors (IMU) to enable positioning even in environments where reception is difficult, such as tunnels and overpasses.