US Patent 9254906 Attitude control for a high-altitude balloon

A high-altitude balloon is provided that may use at least one conductive coil to facilitate attitude control of the balloon. The balloon may include an envelope, a conductive coil, and a control system. The conductive coil may be operatively coupled to the envelope, and the control system may be configured to perform functions. The functions may include determining a measure of rotation with respect to a predetermined orientation of the balloon. The functions may additionally include causing a current to be applied to the conductive coil in a manner such that torque is applied to the envelope that counteracts the measure of rotation and substantially returns the balloon to the predetermined orientation.