Northrop Grumman LITEF

PL41 Mk4 Mod1Inertial Navigaton System

Inertial Navigation System using state-of-the-art digital Ring Laser Gyros in a strap-down confi guration for naval applications.

The PL41 Mk4 Mod1 is a Naval Inertial Navigation System, using the latest low noise digital Ring Laser Gyros in proven state-of-the-art strapdown technology.

The PL41 Mk4 Mod1 is designed for use as the ship’s main reference and navigation system with free inertial or aided navigation capability. The system interfaces with a variety of Logs and embedded or external GPS receivers.

Its high level of performance meets both naviga-tion and fi re control system requirements for all sizes and types of surface vessels and submarines.

It measures motion along and around the three principle axes of the vessel providing heading, roll and pitch as angles and angular rates, acce-lerations, velocities, position and heave.

Features• Very low noise digital Ring Laser Gyro (RLG)

with an MTBF of over 200,000 hours

• System MTBF of over 10,000 hours

• MTTR of less than 30 minutes

• Full built-in test capability

• IMU and all electronic cards can be exchanged at sea

• High data sampling and update rates for mini-mal data staleness

• Automatic switching from align to operate modes

• Solid-state technology

• Short alignment time alongside and at sea

• Supports static and dynamic angle simulation

• Supports wide variety of digital and synchro interfaces

Advantages• Very low maintenance and through life costs

• High system reliability

• High system availability

• Easy maintenance

• High in-service mission time

• Increases combat system effectiveness

• Simple operation

• Very low structure borne noise for submarine applications

• Fast system readiness for vessel operation

• Provision of an in harbour functional test of all connected user systems

• Flexible interface concept to meet all customer requirements

• Full compatibility and exchangeability with in-service PL41 Mk3 systems

Northrop Grumman LITEF

PL41 Mk4 Mod1Inertial Navigaton System

TECHNICAL DATA

For further information, please contact Northrop Grumman LITEF GmbHDefence & SecurityLoerracher Str. 1879115 Freiburg, GermanyPhone: +49 761 4901-443Fax: +49 761 4901-773defence@ng-litef.dewww.northropgrumman.litef.com

©Northrop Grumman LITEF GmbH, Freiburg, GermanyAll rights reserved.Data subject to change without notice.April 2012

Performance

• Accuracy - Heading 0.05° x sec Lat RMS - Roll / Pitch 0.02° RMS - Velocity 0.6 kts RMS - Position GPS accuracy or 1 nm in 8 hours TRMS• Dynamic Stability - Heading 0.003 °/sec - Roll / Pitch 0.001 °/sec• Alignment Time - Dockside 10 min (full attitude accuracy) - At sea: 30 min (full attitude accuracy)

Electrical Characteristics

• Analog (Synchro) - Heading 1x and 36x - Roll / Pitch 1x and 36x or 2x and 36x• Digital Heading, Roll, Pitch, angular rates (in all three

axes), velocities,position, heave and system status via RS422/232 serial data interfaces

Physical Characteristics

• Dimensions (mm) and weight - Basic Unit 450 (W) x 475 (D) x 580 (H) and 79.0 kg - Remote Control and Display Unit 230 (W) x 144 (D) x 317 (H) and 6.0 kg (bulkhead mounted) - Mounting Plate 490 (W) x 525 (D) x 30.5 (H) and 10.5 kg