The application of space-based information is an important foothold in the development of aerospace construction. In view of the rapid improvement of space-based information service capabilities to meet the changing objective needs of future operations， and the background of long-range precision strikes in the typical combat mode of modern warfare is used as the background of space-based information services， and the long-range precision strike combat process is analyzed. A conceptual model of space-based information and battlefield elements in long-range precision strike operations is constructed， combined with the model and referred to the principle of semantic-based publish-subscribe system， a multi-layer index structure for subscription requirements is proposed to realize long-range precision strikes subscription and distribution of space-based information in operations， and finally the performance of the method is verified to meet the operational requirements by experiments.

Aiming at HTV2 （hypersonic technology vehicle 2） targets with high speed and high maneuverability， the midcourse guidance of interceptor missile using hit-to-kill intercept strategy is studied， and a midcourse guidance algorithm based on trajectory tracking and prediction is presented. An adaptive grid interactive multi-mode （AGIMM） filter is used to track the target trajectory stably. The least square method based on forgetting factor is used to predict the trajectory of the target， and the motion state at the predicted handover point is obtained. The target state variables at the predicted handover point are used as midcourse guidance constraint， and the optimal midcourse guidance law is calculated by Gaussian pseudo-spectral method. The interception simulation of HTV2 target is carried out using the proposed midcourse guidance algorithm， and the simulation results prove the effectiveness of the algorithm.