Patent ID: 8183999
Filing Date: 2012-05-22
Classification: G08B

Abstract:
1. A method for locating a person in distress comprising: activating an emergency transceiver to generate a direct-sequence spread-spectrum distress transmission by a person in distress; receiving the direct-sequence spread-spectrum distress transmission at a locator transceiver; transmitting a ranging command from the locator transceiver to the emergency transceiver; receiving the ranging command at the emergency transceiver; and transmitting a direct-sequence spread-spectrum ranging message from the emergency transceiver to the locator transceiver in response to the ranging command; receiving the direct-sequence spread-spectrum ranging message at the locator transceiver; determining a range between the emergency transceiver and the locator transceiver based on delay between the transmitting a ranging command and the receiving the direct-sequence ranging message; and displaying the range to a rescue user.