Abstract:

Aiming at the problem that the traditional algorithm cannot detect the near space hypersonic target effectively, a kind of track-before-detect(TBD) algorithm based on Hough transform and multi-constraint conditions is proposed. Firstly, to get the potential target tracks, the time-radial distance measurement data is used for Hough transform, and the parameter space variable  θ  is made as the accumulation constraint condition to avoid invalid accumulation. Then, all potential tracks are dealt with velocity constraint and angle constraint to further eliminate false tracks and clutter points inside the track. Finally, after merging the same target tracks, the final confirmation tracks are obtained. The validity of the algorithm is verified by simulation, and the algorithm performance under different SNR and clutter density is analyzed. The simulation results show that the near space hypersonic target under the clutter background can be effectively detected according to the algorithm in this paper.

Key words: Hough transform, Multi constraint conditions, Near space, Hypersonic target, Track before detect (TBD)