KVH Industries, of Middletown, says it has authorized a stock buyback program under which the company may purchase up to one million shares, or about 7.1 percent of its outstanding common stock. Management may buy shares from time to time, in privately negotiated transactions or block transactions or through accelerated purchase agreements, according to a filing with federal regulators. The company (KVHI:Nasdaq) manufactures products for mobile communication and navigation systems based on its satellite antenna and fiber-optic technologies.