Abstract:In complex scenes, unmanned systems need fast, reliable and accurate navigation, positioning and timing (PNT) means. At present, PNT mostly relies on the experience of the commander whose task is heavy. In order to liberate the commander from the decision-making task, and then focus on the battle, it is necessary to build PNT service means based on multi-dimensional and multi-layer three-dimensional indicators, design PNT optimization strategy, and evaluate the optimization strategy. In this paper, based on the available navigation means of the unmanned system, the optimization strategy system of PNT navigation means of the unmanned system is established with the idea of system engineering based on the ADC effectiveness evaluation system and the conventional evaluation process. And the system index is quantified by the analytic hierarchy process (AHP) fuzzy analytic hierarchy process. The typical application cases of the unmanned aerial vehicle(UAV ) show that the method proposed in this paper can obtain quantitative values of comprehensive effectiveness in different dimensions, which can be used for reference and decision-making of commanders in multi task and multi scenario. This method can provide support for the construction of PNT system in China.