ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,776, issued on Jan. 27, was assigned to National Time Service Center, Chinese Academy of Sciences (Xi'an, China).

"Long-baseline real-time time transfer method based on undifferenced and uncombined PPP-RTK" was invented by Kan Wang (Xi'an, China), Baoqi Sun (Xi'an, China) and Xuhai Yang (Xi'an, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A time transfer method based on undifferenced and uncombined PPP-RTK is applied to a time transfer system including a PPP-RTK network end observation station network and PPP-RTK user end observation stations. The network end observation station network includes GNSS reference stations and a network data pro...