公开(公告)号：US20180143325A1

公开(公告)日：2018-05-24

申请号：US15819926

申请日：2017-11-21

Applicant: KOREA AEROSPACE RESEARCH INSTITUTE

Inventor： Jae Ik PARK ,  Eun Sung LEE ,  Moon Beom HEO ,  Gi Wook NAM

IPC: G01S19/07 ,  G01S19/27 ,  G01S19/02

CPC classification number: G01S19/07 ,  G01S19/02 ,  G01S19/05 ,  G01S19/27

Abstract: A Global Positioning System (GPS) receiver, a control method of the GPS receiver, and a GPS system are provided, which are capable of reducing an initial position check time using an SBAS signal transmitted from a SBAS satellite. The control method of a GPS receiver includes receiving an SBAS signal from a SBAS satellite and calculating a satellite clock and a satellite position of the GPS receiver using the received SBAS signal. The SBAS signal may contain a difference value between the ephemeris data and the almanac data of the GPS satellite. The difference value between the ephemeris data and the almanac data may include a satellite clock difference value and a satellite position difference value for the GPS satellite. Accordingly, it is possible to acquire the current position and time information more quickly and accurately, by shortening the initial position check time using the difference value between the ephemeris data and the almanac data included in the SBAS signal.

公开(公告)号：US20170184723A1

公开(公告)日：2017-06-29

申请号：US15342431

申请日：2016-11-03

Applicant: Korea Aerospace Research Institute

Inventor： Young Sun YUN ,  Eun Sung LEE ,  Moon Beom HEO ,  Gi Wook NAM

IPC: G01S19/08 ,  G01S19/20

CPC classification number: G01S19/08 ,  G01S19/20

Abstract: Disclosed is a system for determining a protection level. The system includes a receiver configured to receive an error augmentation for a satellite orbit and clock error, an error augmentation for an ionospheric error, an error augmentation for noise and multi-path between a receiver and a satellite, and an error augmentation for a tropospheric error, a first calculator configured to calculate a first adjustment coefficient to be applied to the error augmentation for the satellite orbit and clock error and the error augmentation for the ionospheric error, and a second calculator configured to calculate a protection level by applying the first adjustment coefficient.