Abstract
In high-frequency (HF) hybrid sky-surface wave radar, the first-order sea clutter broadening is severe under the action of ionospheric phase disturbance and bistatic angles. In this paper, a cascaded method is described to suppress the spread sea clutter. Firstly, the radar configuration and sea clutter broadening model are introduced based on the newly developed integrated HF sky-surface wave experimental system. In the cascaded processing method, a new ionospheric decontamination method based on general parameterized time-frequency (GPTF) analysis is proposed to estimate or correct the ionospheric phase distortion with large amplitude. Then, the forward-backward linear prediction (FBLP) algorithm is used to suppress the spread sea clutter caused by bistatic angle. Simulation results show that such ionospheric decontamination method based on GPTF is helpful for the large-amplitude ionospheric contamination when the target masking effect happens even after ionospheric phase decontamination. Finally, the proposed method is examined by the measured data. Experimental results indicate that the proposed method can well suppress the broadening sea clutter for HF hybrid sky-surface wave radars.
Highlights
Ship detection is an important mission of the HF over-thehorizon radar
Ionospheric phase disturbance further contributes to the sea International Journal of Antennas and Propagation clutter spectrum broadening. us, the broadening of the first-order sea clutter spectrum is very severe under the influence of ionosphere and bistatic angles
In the process of cascade processing of broadened sea clutter in this paper, ionospheric phase decontamination was first processed. At this time, decontaminated broadening sea clutter is only caused by bistatic angles. erefore, the broadening sea clutter suppression was processed after decontamination
Summary
Ship detection is an important mission of the HF over-thehorizon radar. Based on the propagation mode associated with sky-wave transmitting and surface wave receiving, HF hybrid sky-surface wave radar maintains the superiority of HF sky-wave radar which has a long detection range and wide coverage, the advantage of HF surface wave radar which has a stable propagation channel and keeps a good invisibility and anti-interference ability [1,2,3,4]. Zhao et al [5] presented an experimental study of HF passive bistatic radar via hybrid sky-surface wave mode based on Digital Radio Mondiale digital amplitude modulation broadcasting in 2013 and analyzed the target detection performance. A cascaded method for ionospheric decontamination and sea clutter suppression to enable detection of ship target is proposed. A cascaded processing method for ionospheric decontamination and sea clutter suppression is presented In this method, the timefrequency analysis method based on GPTF is proposed to correct the ionospheric phase contamination with large amplitude. Experimental results indicate that the proposed method can well suppress the broadening sea clutter for HF hybrid sky-surface wave radars. Experimental results indicate that the proposed method can well suppress the broadening sea clutter for HF hybrid sky-surface wave radars. e research in this dissertation will provide the theory and technology foundation to detect the target over the horizon under the broadening sea clutter in HF hybrid sky-surface wave radar
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