Abstract: Accurate situational awareness of maritime targets in 24/7 is crucial for safeguarding national maritime rights and ensuring maritime safety. In response to the limitations of existing passive detection technologies such as wireless detection and photoelectric detection in detecting target types and multi-target detection capabilities, as well as the anti-interference and concealment capabilities of active radar, experimental research on passive perception technology for sea targets based on pulse radar signals was conducted, targeting various ships on the sea surface. The basic principle of passive situation perception system for targets detection was provided. The measurement of direct wave pulse signal parameters, analysis of antenna scanning characteristics and data pre-processing, pulse accumulation and moving target indication processing, constant false-alarm rate detection and display correction were completed based on field measurement data. The trial results were verified and analyzed using ship automatic identification system information, which verified the feasibility and effectiveness of maritime targets detection by passive situation perception technology based on non-cooperative pulse radar signals.