This work is for evaluating the intentional interference against GNSS receiver on surface ships. The case study was performed under considerable assumptions based on the GPS jamming events around the Korean Peninsula in recent years. The propagation loss

GNSS systems have been rapidly expanded and developed in the global community. New signals have also increased for civilian and military uses. Multiple frequencies on constellations are being broadcasted in similar spectrum band.

The propagation- path environment might be a significant issue in EW combat field. The "electromagnetic wave" is spreaded through free space or various paths with specific propagation loss. The certain amount of loss is inevitable due to the different..

Even though the several famous institutes involving U .S. DOT Volpe center informed that GNSSs(Global Navigation Satellite System) are vulnerable to intentional and unintentional interference.