Abstract: With the continuous advancement of operation capabilities in next-generation radar equipment, external information guidance modes based on radar intelligence are becoming increasingly prevalent among firepower units. To address the pressing need for evaluating the reliability of such external guidance information, this paper presents a post-hoc analysis method based on the error comparison between ground-truth trajectories and reported radar data. The proposed method incorporates the key procedures including data association and fusion, coordinate error transformation, and firepower effectiveness evaluation, thereby establishing a comprehensive framework for assessing information credibility. Simulation results demonstrate that the method enables rapid and automated evaluation of external guidance effective, providing reliable prior support for decision-making in firepower operations utilizing external information sources.