Two-Hierarchical Hough Transform for Sky-wave Over-the-Horizon Radar Track Initiation

In this paper, a data preprocessing method for sky-wave over-the-horizon radar (OTHR) track initiation using two-hierarchical 2D Hough transform is proposed. We firstly use range-time data space to hierarchical I Hough transform and obtain rough candidate measurement sequences, where Doppler is used as an accumulation constraint; then we use the corresponding azimuth and time measurements to hierarchical II Hough transform to refine above sequences for track initiation. Simulation results show that the proposed method can eliminate clutters efficiently and make significant improvement in reducing false tracks