Fractal Features and Detection of Meteor Interference in OTHR

Backscatter signal from OTHR receiver may contain strong noise and interference background, among which the meteor echo is a typical and strong Impulsive interference. This meteor echo may inject transient but great power into the receiver, arise the noise floor in the range-Doppler map and decrease SNR. So it must be suppressed before target tracking. Many solutions are presented for meteor echo excisions, among which the meteor position must be estimated firstly. Usually the ocean clutter is so strong that it may cover other signals such as target and meteor, so it must be suppressed before position estimation. Different from these approaches, this paper proposes a novel algorithm of meteor position estimation without depressing clutter. The main idea is focused on the different fractal dimension corresponding to the ocean clutter and the meteor echo. Accounting for the real-time processing requirements, an effective of directional fractal dimension based on the fractional Brownian motion model is also proposed. Experiments prove that it is an effective method