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Joint precision approach and landing system

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LAAS Architecture

The Joint Precision Approach and Landing System (JPALS) is a military, all-weather landing system based on real-time differential correction of the GPS signal, augmented with a local area correction message, transmitted to the user via secure means. The onboard receiver compares the current GPS-derived position with the local correction signal, deriving a highly-accurate three-dimensional position capable of being used for all-weather approaches via an ILS-style display. JPALS is a form of differential GPS..

History

The need for JPALS was identified in response to two factors. First, the military needs a highly-mobile all-weather precision approach system, tailorable to a wide range of environments, from shipboard use to rapid installation at austere airfields. Second, they need a robust system that maintains a high level of reliance in combat operations, particularly, one that's highly resistant to jamming.

Operation

JPALS falls into two main categories, SRGPS and LDGPS. SRGPS provides highly-accurate approach positioning for operations aboard ship, including aircraft carriers, helo and S/VTOL carriers, and other shipboard operations, primarily involving helicopter operations.

LDGPS is further divided into three sub-categories: Fixed Base, Tactical, and Special Missions. Fixed Base is used for ongoing operations at military airfields around the world, while the Tactical system is a portable system, designed for relatively short-term, austere airfield operations. The system designed for Special Missions is more than just highly mobile - it's portable, capable of rapid installation and use.

Accuracy

The accuracy of LAAS, Local Area Augmentation System, is better than CAT III ILS accuracy, and will provide horizontal and vertical resolutions of less than 1 m.

It's estimated that JPALS will meet or exceed this accuracy for authorized users.

Benefits

The main benefit of JPALS is that it's a system that can be taken anywhere, anytime, providing a safe and effective way to conduct 24/7, all-weather, anti-jam instrument landing system capability to all authorized users, worldwide.

A secondary benefit is a significant reduction in cost savings over current systems, currently available only to larger, more permanent military installations.

The increases in both accuracy and reliability will significantly enhance operations while reducing non-operational periods.

See also



References

  • ^ Federal Aviation Administration (FAA) (February 27, 2004). "Local Area Augmentation System (LAAS) Fact Sheet". Retrieved November 20. {{cite web}}: Check date values in: |accessdate= (help); Unknown parameter |accessyear= ignored (|access-date= suggested) (help)CS1 maint: year (link)
  • ^ Department of Transportation and Department of Defense (March 25, 2002). "2001 Federal Radionavigation Plan" (PDF). Retrieved November 27. {{cite web}}: Check date values in: |accessdate= (help); Unknown parameter |accessyear= ignored (|access-date= suggested) (help)CS1 maint: year (link)
  • IHS Aerospace - Honeywell (July 7, 2005). Honeywell to Update Local Area Augmentation System (LAAS) Prototype. Press Release.
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