Abstract:

SecurityProtection of global navigation satellite systems plays an important role in navigation systems and materiel. Firstly, its definition, description and study contents were introduced. Secondly, according to the view of system engineering, the process of securityprotection was indicated, followed by a mathematical model which consists of interference strategy, attack level, the level of protection and combat scenario. Finally, an example was used to analyze the GNSS receivers’ securityprotection. The results first indicate that: 1) the protection level relative to the level of enemy attacks is a key factor affecting the operational utility; 2) different combat scenarios have different needs for the level of protection, and 3) the effect of enemy interference policy on our operational utility depends on the corresponding level of protection.

Key words: GNSS;securityprotection;navigation performance;operational utility