LAUSR

This letter presents a multitarget tracking algorithm—thresholded sequential Monte Carlo probability hypothesis density (TH-SMC-PHD) algorithm. The TH-SMC-PHD aims to overcome the problem that underwater multitarget tracking is prone to missing tracking on sonar images, resulting in the breakage of trajectories. First, cell average (CA)-constant false alarm rate (CFAR) and K-means are employed to detect potential underwater targets from sonar images, respectively. Then, the TH-SMC-PHD is applied to the detection results for tracking, using a continuously lost frame threshold to reduce the missing tracking rate (MR) and the minimum-sampling-variance (MSV) resampling to improve tracking accuracy. An actual underwater multitarget tracking experiment using a forward-looking sonar was contracted in a water tank to evaluate the tracking performance. Compared with the other two PHD tracking algorithms, the results demonstrate that the proposed algorithm achieves high-precision, non-fracture, non-missing tracking of three targets. In addition, the TH-SMC-PHD is more stable and less affected by different detection algorithms, which has the potential for practical applications.