LN-251 Advanced Airborne INS/GPS (EGI)
![LN-251 Advanced Airborne INS/GPS (EGI) – hero woman in lab](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/LN-251-Advanced-Airborne-hero.jpg?mw=3840&rev=26626f58f95e476e9938f80978a44334)
LN-251 (INS/GPS) is the smallest, lightest, lower power, and most reliable navigator with unsurpassed geo-location and velocity accuracy in its class
The LN-251 is a fully integrated, non-dithered navigation system with an embedded 12/24 channel, All-In-View, Selective Availability/Anti-Spoofing Module (SAASM), P(Y) code or Standard Positioning Service (SPS) GPS. The LN-251 fully integrated, tightly coupled GPS inertial design provides superior navigation performance relative to other embedded INS/GPS units. The non-dithered inertial sensor achieves the lowest measurement error in its class for increased sensor accuracy. Its modular open system architecture provides for easy adaptation to other applications and evolving requirements.
![Northrop Grummans LN-251 embedded global positioning/inertial navigation system Electronic box with inertial navigation system](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/283951_4c9330fc-a1db-42b9-85ca-4b981654ff77-prv.jpg?mw=3840&rev=e40455ec73a9406ba45411203d50c844)
LN-251 Advantages
Northrop Grumman's highly reliable LN-251 INS/GPS has various advantages, including light weight, low cost and high performance. The LN-251 fiber-optic gyro (FOG) employs one of our most modern technologies and includes three independent navigation solutions: blended INS/GPS, INS-only, and GPS-only. The non-dithered, low noise FOG technology eliminates self-induced acceleration and velocity noise. Additionally, Standard Positioning Service GPS (coarse/acquisition code) is available. Our LN-251 has independent and programmable inputs and outputs for flight controls and avionics. The LN-251 has a non-dithered inertial sensor that allows additional accurate velocity measurements and is available in 0.8, 1.0 and 2.0 nmi/hr classes of performance. The system is capable of AR-57 shipboard alignment.
LN-251 Growth Potential
The LN-251 is available with an integrated high anti-jam GPS subsystem and has the ability to integrate with M-Code, when available. The LN-251 is currently capable of supporting a Joint Precision Approach and Landing System solution and will continue to integrate with other DGPS solutions, including ZNAV™. In the near future, the LN-251 will possess a self-contained Real Time Kinematic solution for refueling or precision landing.