Abstract: An IMM-based and an AGIMM-based adaptive update interval algorithm are proposed for the adaptive update interval problem in phased array radars. In the former algorithm, the update interval is proportional to the inverse square root of the position residual. In the AGIMM-based algorithm, the update interval adjusts according to the moving step of the mid-model. In order to balance the tracking precision and system load effectively, a controllable parameter is introduced. Simulation results demonstrate the effectiveness of the algorithms.

Key words: adaptive update interval, interacting multiple-model, adaptive grid IMM, system load