Port Canaveral said Friday that it will use a $2.8 million grant from the Department of Homeland Security to improve its radio communications system and build the first phase of an Emergency Operations Center. The port will match the grant with an additional $700,000, chief executive Stan Payne said. A new radio system is essential, he said, as the port continues to grow its cruise and cargo businesses. The emergency center is planned for the north side of the port, where those businesses, including a planned fuel farm, are expanding. During the last five years, Port Canaveral has received a total of $6.5 million in homeland security grants.