OVERVIEW: Low Probability of Intercept (LPI) radar masts are advanced radar systems integrated into periscopic or retractable masts, primarily used on submarines and certain stealth vessels. They enable situational awareness and surface search without significantly increasing the risk of detection by enemy ESM systems.

GENERAL DESCRIPTION: These systems use low peak power, wideband or frequency-modulated continuous wave (FMCW) signals, often coupled with frequency agility, pulse compression, and AESA (Active Electronically Scanned Array) technologies to minimize detectability. LPI radar masts are designed to blend into the RF background, reducing interception by radar warning receivers. Deployed primarily on modern submarines and some stealthy surface ships, they are ideal for navigation, early threat detection, and periscope-level surveillance. Some units are integrated with other sensors like EO/IR turrets or communications antennas.

ROLE SUMMARY:
Category: Radar / Surveillance
Primary Use: Surface search and navigation with low electromagnetic signature
Function: Active radar with stealth-oriented emission control
Platform: Submarines, stealth vessels, special operations platforms
Integration: May include sensor fusion with EO/IR, ESM, and communication systems

See Specific information under [Sensors/EW] and [Properties] sections.

SOURCE:
Naval Radar System Documentation
https://en.wikipedia.org/wiki/Low_probability_of_intercept_radar
Janes Submarine Systems