Regional positioning system using turksat satellites

Abstract

A Regional positioning system using three geosynchronous Turksat satellites is investigated in this paper. In this system, a time code signal sent from an earth station to three geostationary satellites is received by a user on Earth. Time delay differences from three satellites are measured by the user and are used to calculate the user's position. The user's location information includes latitude and longitude coordinates. It is assumed that the user's altitude is measured by an altimeter.

Determination of Coverage Oscillation for Inclined Communication Satellite

“…A satellite crosses the earth equator twice a day. Satellite completes its' 12 hours' revolution over the northern hemisphere and another 12 hours over the southern hemisphere due to the inclination angle [8,[11][12][13]. Figure 3 shows satellite inclination angle instantaneous values for 1 o , 3 o , and 5 o inclination over one revolution period.…”

Regional Positioning System Development over Turksat Geostationary Telecommunication Satellites

“…The design phase started with analyzing the employed time difference of arrival of Ku band signals transmitted from Turksat satellites at 31°, 42°, and 50° east longitude orbital locations . Moreover, the deviation in the calculated position due to the angular distances between the satellites is also tabulated in . When the satellites get closer to each other, the position calculation becomes very difficult and highly sensitive to error sources.…”

“…From these three locations, satellites will be able to provide a service area, which covers Turkey and neighboring regions. Because Turksat communication satellites generally operate at Ku band frequencies, the positioning system signals will be generated at the available Ku band frequency slots .…”