Optimal Thrust Allocation for TBM Interceptor Midcourse Guidance,
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
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Interceptors for tactical ballistic missile defense typically are conceived to have midcourse phases that make corrections to the original interceptor free-flight path based on updated threat state estimates from the filter associated with a remote sensor. Some concepts call for one midcourse correction, while others call for more frequent corrections. The goal of this study is to find the optimal frequency of midcourse corrections from the point of view of minimizing the terminal error, as well as to determine, for a given design, the optimal allocation of thrust resources. It is found that the more frequently the corrections are made, the less the errors are that are handed over to the terminal phase. Furthermore, even when less fuel is available than that required to take out all known errors, the optimal strategy is to make corrections as soon as the amount of correction required just equals the amount of divert available for each burn, until midcourse divert fuel is exhausted. If continuous thrust is available with a throttlable rocket, then the optimal strategy is almost always to continuously make corrections to keep the known errors at zero, until fuel is exhausted or terminal homing conunences.
- Antimissile Defense Systems