< Projeler Sayfası

Proje Adı
GNSS Kullanılarak Uydu Yönelimi Belirlenmesi Kavramsal Doğrulaması

Şirket Adı
TAI

Şirket Mentoru
Burak Akbulut

Akademik Mentor
Doç. Dr. Sinan Gezici

Asistan
Merve Begüm Terzi

Takım Üyeleri
Arda Şen, Erdoğan Can Ünlü, Cem Tansu, Noyan Evirgen, Metehan Yurt, Özgür Can Sakıncı

Summary
All satellites need to obtain information about their orientation. A low cost method for orientation sensing is using the GPS antennas, which are located on the satellite for orbit determination purposes. Our project’s main purpose is to provide a proof of concept for satellite attitude determination for low-Earth orbit satellites (orbit range is between 700 km and 1000 km) using GNSS signals. For that purpose, a system has been constructed containing 3 active GPS/GLONASS antennas, 3 GPS receivers that can output raw GPS data, an inertial measurement unit (IMU) for verifying the algorithm outputs and a BASYS2 FPGA board for obtaining synchronized GPS data. A novel algorithm has been developed, which uses differences in GPS signal strength measurements (carrier to noise density ratio, C/N0) and an Extended Kalman Filter (EKF) for orientation tracking. Signal strength measurements, receiver position in ECEF coordinate system plus GPS satellite positions are obtained from the receivers. The algorithm has been implemented in MATLAB environment, and the synchronized GPS data plus the IMU data are input to the system via USB ports. The outputs of the algorithm are visualized in a graphical user interface in MATLAB, which shows the Euler angles (roll, pitch and yaw) plus a visualization of these angles on a 3-D plot.