An interference suppression method based on 2D spatial filtering of FDA systems
Frequency diverse arrays have attracted wide attention of researchers,due to the array system can provide controllable degree of freedom in range dimension.FDA-MIMO radar systems can achieve better target detection capability than common array radars.However,when FDA-MIMO radar suffers from mainlobe decep-tive interference,the target detection performance will be seriously degraded.Unfortunately,traditional interfer-ence suppression methods cannot suppress main lobe deceptive interference effectively.A two-dimensional spatial filter design method based on chaotic sequence based nonlinear frequency offset is proposed.Numerical simula-tions demonstrate the effectiveness of the proposed method.Compared with the 2D spatial filter based on logarith-mic nonlinear frequency offset,the filter based on chaotic sequence based nonlinear frequency offset can suppress interference and retain targets information better.
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