This is a system for measuring ocean surface currents from an airborne platform. A radar system having two spaced antennas wherein one antenna is driven and return signals from the ocean surface are detected by both antennas is employed to get raw ocean current data which is saved for later processing....http://www.google.co.uk/patents/US4990922?utm_source=gb-gplus-sharePatent US4990922 - System and method for measuring ocean surface currents at locations remote from land masses using synthetic aperture radar
