Vehicle Satellite Interactivity Database by GPS Signal Reception Collected in the Civil Activities

A novel scheme is proposed and demonstrated where satellite visibility viewed from running vehicle is economically and effectively evaluated with such low cost GPS receivers like automobiles are equipped with. Our preliminary experiment articulated even economical L1 C/A GPS receivers can create enough precise database of ground feature blockage if only two statistical parameters we propose are adequately set. The geographical characteristics of satellite visibility are demonstrated in this scheme. A blockage database will be created in the cooperation with the government and the civil in the style of a low-cost and large-scale automatic survey. The blockage database will very be useful in future´s mobile and vehicle satellite communication society, because it allows vehicular satellite communication terminal anticipating the coming blockage and preparing satellite handovers effectively