Abstract
The presence of a microprocessor makes it possible to utilize a digital filter to process the measurement data and obtain a state estimate to be used in a digital guidance system for tactical homing missiles. Of particular interest is the case of the short range, air-to-air missile against a highly maneuverable target when angleonly measurements are available. Two schemes are proposed which improve the homing performance. The first is an extended Kalman filter with the adaptive feature of estimating the measurement variance on line. The second is an adaptive guidance scheme based on an exponential cost function which is used in conjunction with the filter.
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