GPS World

Tag: Navigation Data Distribution System

  • Thales inertial navigation system boards French Navy vessel

    Thales inertial navigation system boards French Navy vessel

    The TopAXYZ inertial navigation unit by Thales. (Image: Thales)
    The TopAXYZ inertial navigation unit by Thales. (Image: Thales)

    Thales and CS Group partner to offer navies a cybersecure, jam-resistant navigation system inspired by civil aviation

    Thales and CS Group have partnered to offer a complete navigation system for navy surface ships. At the heart of the system is the Thales TopAxyz inertial navigation unit, which is integrated with CS Group’s real-time computer to combine high-level performance and resilience in an electronic warfare environment. The system provides high-precision pointing, gyrocompass, location and navigation functionality for all types of naval platforms, from surface combatants and submarines to autonomous vehicles.

    The TopAxyz inertial navigation unit has delivered outstanding performance in the rigorous conditions of civil aviation, clocking more than 20 million hours of operation. The naval version of the unit was integrated on a French Navy vessel in less than a day by CS Group, and has already proven its operational value for maritime navigation in a sea trial.

    “After proving their value on board aircraft, space launchers and French Army land vehicles, Thales inertial navigation systems are now available for naval platforms,” said Tristan Grivel, vice president business development and sales for Thales’s flight avionics business.

    “CS Group has supplied real-time navigation computers, military-grade GPS receivers and other solutions to the French Navy and Naval Group for many years, explained Gilles Rigal, director of CS GROUP’s naval systems business line. “This partnership with Thales allows us to offer an innovative, robust and resilient maritime inertial navigation system for surface ships,” Rigal said.

    Countering electronic warfare

    In today’s constantly changing naval environment, crews need to contend with the threat of cyberattacks, electronic warfare activity and the high risk of jamming and spoofing of GPS-based radionavigation solutions. Accurate navigation data, real-time data distribution and resistance to external threats are crucial for every mission conducted by a naval vessel today.

    Thales and CS Group have worked together for more than 20 years to address these issues. Drawing on their combined expertise across all the key navigation system technologies, the two companies are now proposing a new approach to maritime navigation based on more trustworthy and reliable navigation data.

    The TopAxyz inertial unit uses accurate, reliable navigation information that is independent of sea state and vessel location, combined with a function that detects attempts to spoof GPS signals. The navigation data calculated by TopAxyz is distributed in real time by the NDDS (Navigation Data Distribution System) developed by CS Group’s onboard computer.

    The computer uses the latest technological advances in cybersecurity, guaranteeing the best level of resilience to attacks. Its architecture offers three key advantages: safer navigation, reduced costs and integration risks, ease of use and simplified maintenance of the system. No calibration is required during the service life of the system, reducing the total cost of ownership.

    The new maritime navigation system are now available, and are being manufactured at the companies’ production and integration facilities in Châtellerault and Aix-en-Provence in France.

  • Northrop SeaFIND guides navies around the world

    Northrop SeaFIND guides navies around the world

    Photo: Northrop Grumman
    Photo: Northrop Grumman

    The SeaFIND inertial navigation system (INS) on April 1 received Type Approval from the U.S. Coast Guard, confirming that it meets an important international performance benchmark.

    SeaFIND — Sea Fiber Optic Inertial Navigation with Data Distribution — was developed by Northrop Grumman for small- to medium-size combatant and auxiliary ships. With its small footprint, it can also be used on unmanned underwater and surface vehicles, or coastal and offshore patrol vessels.

    SeaFIND builds from the software, algorithms and digital messages used on the MK39, a ring-laser INS installed around the world with the U.S. Navy and partner fleets. Instead of a ring-laser gyro, SeaFIND uses Northrop Grumman’s enhanced fiber-optic gyro technology (eFOG). eFOG maintains equivalent performance in a much smaller footprint — yet is more reliable.

    “Fiber-optic technology is inherently more reliable with a higher mean time between failure rate than ring-laser gyro technology, which requires a high-voltage laser to operate and degrades over time,” explained Tom Disy, manager of Strategic Planning for Maritime/Land Systems & Sensors. An improved version of FOG, eFOG allows for the inertial measurement unit (IMU) within SeaFIND to achieve dependable navigation-grade performance, Disy explained.

    SeaFIND’s embedded Navigation Data Distribution System (NAVDDS) software collects all the navigation data the ship receives, including SeaFIND and GPS data. NAVDSS then provides this data to other ship systems in a time-corrected, system-specific format. Time correction is necessary to maintain accuracy requirements, especially for applications requiring highly accurate dynamic attitude. NAVDDS’ low data latency allows the system to interface with any users that require accurate position and timing, such as combat systems or TACAN (tactical air navigation systems).

    The SeaFIND INS complements the data received from GNSS. “Our inertial systems utilize GPS data when available; however, the SeaFIND INS also provides other key navigation data, including heading, roll and pitch,” Disy said. “The SeaFIND INS provides reliable position data for a significant period of time if the GNSS system data becomes unreliable or unavailable for any reason.”

    SeaFIND is not subject to ITAR (International Traffic in Arms Regulations) and available for use by domestic and international navies.