Abstract
This paper presents an enhanced <TEX>${\alpha}-{\beta}$</TEX> tracking filter whose <TEX>${\alpha}-{\beta}$</TEX> gains are updated by an approximation method at every scan to account for the transition of measurement dependent observation error variance in two-dimensional Cartesian coordinates. The approximate <TEX>${\alpha}-{\beta}$</TEX> gains are calculated from the amount of the change in the tracking index and the partial derivatives of the <TEX>${\alpha}-{\beta}$</TEX> gains with respect to a nominal tracking index. It is shown via simulation that the proposed tracker provides improved performance compared to the conventional <TEX>${\alpha}-{\beta}$</TEX> tracking filter.
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