Communication satellite orbit and iridium satellite plan´s restarting

Communication satellite has such characteristic of broad coverage. The signal of communication satellite should cover the whole world theoretically. In this paper, we have studied the relationship between communication mode and orbit under the different orbit height. We have studied that how to make the rate of coverage reach the maximum on the precondition of the lowest cost and the qualified communication. In this paper, we also have concluded that with the development of aerospace technology, it is possible to restart iridium satellite.