It is difficult to build accurate model for measurement noise covariance in complex backgrounds. For the scenarios of unknown sensor noise variances, an adaptive multi-target tracking algorithm based on labeled random finite set and variational Bayesian(VB) approximation is proposed. The variational approximation technique is introduced to the labeled multi-Bernoulli(LMB)filter to jointly estimate the states of targets and sensor noise variances. Simulation results show that the proposed method can give unbiased estimation of cardinality and has better performance than the VB probability hypothesis density(VB-PHD) filter and the VB cardinality balanced multi-target multi-Bernoulli(VB-CBMe MBer) filter in harsh situations. The simulations also confirm the robustness of the proposed method against the time-varying noise variances. The computational complexity of proposed method is higher than the VB-PHD and VB-CBMe MBer in extreme cases,while the mean execution times of the three methods are close when targets are well separated.
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