Preventive quality control activities in the defense industry are being strengthened. This study presents a case for securing design quality by identifying quality instability factors during weapon system development and management to ensure robustness against external environmental changes. The implications of improving robustness from the design stage to alleviate the performance deviation of the
radar system that occurs owing to changes in the weather environment are analyzed. A new quality control challenge that appears in long-range radars is that the radar performance frequently deteriorates as radio waves are refracted by an abnormal atmosphere. To manage the quality of a radar system, it must be robustly designed and implemented, considering the ever-changing weather environment from the
development stage. Therefore, a procedure for establishing a sophisticated atmospheric model suitable for the meteorological environment of the Korean Peninsula is proposed, considering all abnormal atmospheres, and its effectiveness is verified through an applied radar development case and M&S analysis.