Overview: The LIRD-4 Laser Warning System is designed to enhance the survivability of military vehicles by detecting laser threats and providing timely warnings to the crew. This system is crucial for counteracting laser-guided weapons, which pose significant threats to armored vehicles.

Specifications:

• Direct Detection Module: Operates within a spectral range of 0.4 – 1.8 µm, with 10 receivers covering 20 sectors. The field of view in azimuth is 360° and in elevation from -20° to +60°.
• Indirect Detection Module (LIRD-4A): Covers a spectral range of 1.0 – 1.6 µm with a single receiver. It provides a 360° azimuth field of view and an elevation range from -7° to -13°.
• Indicator Unit: Offers angular resolution in azimuth of 20 x 18° and characterizes threats as laser rangefinder (LR), laser designator (LD), indirect radiation (IN), and beam rider (BR).
• Memory: Stores the last 20 threats detected.
• Data Transmission: Utilizes RS 422 for threat events and RTI for real-time interface pulses. Interfaces include connections to smoke grenade systems and intercoms for audio warnings.
• Dimensions and Mass: The detector head measures Ф 150 x 200 mm and weighs 3.2 kg, while the indicator unit measures 62 x 120 x 190 mm and weighs 1.6 kg.

Functionality: The LIRD-4 system detects laser sources across a wide spectral range, including various types of lasers such as Nd:YAG, Ruby, and semiconductor lasers. It provides both visual and audio alerts to enable timely countermeasures like maneuvering or deploying smoke screens.

Components: The system comprises a hermetically sealed detector head and an indicator unit, along with necessary cables and mounting accessories. The detection head identifies the horizontal angular sector of the threat, which is displayed on the indicator unit.

Unique Features:

• LIRD-4A: Capable of detecting indirect or scattered light, which is crucial for identifying threats aimed at nearby areas to avoid detection.
• LIRD-4B: Specializes in detecting beam rider threats.

Contact Information: Fotona d.d., Stegne 7, 1000 Ljubljana, Slovenia. Tel: +386 1 5009 100, Fax: +386 1 5009 200, Website: www.fotona.si