Korea Aerospace Research Institute

Gi Wook Nam

Eun Sung Lee

Moon Beom Heo

Young Sun Yun

Jae Ik Park

Kwang Sik Choi

Woon Ki Hong

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.

Method and system for time to first fix (TTFF) reduction of GPS receivers using satellite based augmentation system (SBAS) signal

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.

System and method for determining protection level

Provided is a satellite navigation visibility calculation apparatus. The satellite navigation visibility calculation apparatus includes a processing unit configured to binarize an input sky view image to create an binary image, an extraction unit configured to extract a plurality of feature points from the binary image, and a calculation unit configured to calculate satellite navigation dilution of precision (DOP) corresponding to the sky view image using the plurality of feature points.

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Daejeon, South Korea

Gi Wook Nam