The Histogram Probabilistic Multi-Hypothesis Tracker (H-PMHT) is a parametric track-before-detect algorithm that has
been shown to give good performance at a relatively low computation cost. Recent research has extended the algorithm
to allow it to estimate the signature of targets in the sensor image. This paper shows how this approach can be adapted to
address the problem of group target tracking where the motion of several targets is correlated. The group structure is treated
as the target signature, resulting in a two-tiered estimator for the group bulk-state and group element relative position.