In this paper, a new method of modeling a full strap-down laser seeker is proposed for the seeker's characteristics of large field-of-view, small linear area and slight fluctuation in the line-of-sight angle. Moreover, a new switching logic guidance method with pre-estimating function is suggested. Adding pre-estimation and switching correction items to the original, this method is able to switch the line-of-sight angle from the nonlinear to the linear zone quickly and steadily; on the other hand, it also limits the seeker frequent switching between the linear and nonlinear zone caused by the missile's oscillation.
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