A proposal of SS communication system using LEO satellite for observing ecology of sea turtles

摘要

In this paper, we examine a system for observing the ecology of sea animals by means of a low Earth orbit satellite. We consider the system performance in the up-link, which is a communication link from the animal stations to the satellite. Since the up-link conditions are severe, we employ M-ary/SS with CDMA ALOHA as a multiple access scheme. A key issue to realize the system depends on an acquisition technique which is robust to the effect of large Doppler shift caused by the rapid movement of the low Earth orbit satellite. In this paper, we discuss code-acquisition and estimation of carrier frequency considering the M-ary/SS/CDMA technique to realize this system.