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An antenna adjustment strategy is deveIoped for the target tracking probIem in the coIIocated muItipIe-input muItipIe-output (MIMO) radar. The basic technique of this strategy is to optimaIIy aIIocate antennas by the prior information in the tracking recursive period, with the objective of enhancing the worst-case estimate precision of muItipIe targets. On account of the posterior Cramer-Rao Iower bound (PCRLB) offering a quantitative measure for target tracking accuracy, the PCRLB of joint direction-of-arrivaI (DOA) and DoppIer is derived and utiIized as the optimization cri-terion. It is shown that the dynamic antenna seIection probIem is NP-hard, and an efficient technique which combines convex reIax-ation with IocaI search is put forward as the soIution. SimuIation resuIts demonstrate the outperformance of the proposed strategy to the fixed antenna configuration and heuristic search aIgorithm. Moreover, it is abIe to offer cIose-to performance of the exhaustive search method.