This study is related to the use of adaptive H-infinity filter for multi sensor data fusion ( based tracking. AHIF can work efficiently in the presence of uncertainties using sliding window concept. In the present use of , the length of window size is varied to eliminate/minimize the estimation errors and predict almost precise location of a target. Simulation experiments are conducted to evaluate performance of in comparison with Kalman and H-Infinity filters for mild and evasive maneuvering targets. Performs better in terms location accuracy and position fit error