OCEAN SURFACE WIND DIRECTION RETRIEVAL FROM REFLECTED RADIO SIGNALS ON SPACE-BORNE PLATFORMS

摘要

A sequence of two or more consecutive DDMs is received. The sequence is calculated over two or more corresponding times from a digital DLOS IF signal, a digital reflected IF signal and known locations of one or more antennas of a receiver, a transmitter, and a specular point (SP). The sequence can be received in real-time or some time after acquisition. A feature vector (x) is calculated that includes two or more wind direction-dependent features of the digital reflected IF signal using the sequence of DDMs. A wind direction ϕ is calculated at the SP from the calculated x and a machine learning model (f(x)) that relates x to ϕ (ϕ = f(x)). The machine learning model f(x) is trained using one or more sets of previously measured data that include measured ϕ values for corresponding sequences of calculated DDMs used to calculate corresponding x values.