Joint precision approach and landing system: Difference between revisions

Revision as of 20:07, 27 March 2015

Revision as of 21:42, 30 November 2015

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[[Image:LAAS Architecture.svg|right|thumb|300px|LAAS Architecturearchitecture, similar in concept to JPALS LDGPS Fixedfixed Basebase category]]

The '''Joint Precision Approach and Landing System (JPALS)''' is a military, all-weather landing system based on real-time differential correction of the [[Global Positioning System|GPS]] signal, augmented with a local area correction message, and 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 [[Instrument Landing System|ILS]]-style display. While JPALS is similar to [[Local Area Augmentation System]], but intended primarily for use by the military, some elements of JPALS may eventually see their way into civilian use to help protect high-value civilian operations against unauthorized signal alteration.

==History==

[[Image:JPALS Tactical Prototype.jpg|250px|thumb|JPALS Tacticaltactical Prototypeprototype]]

The development of JPALS was a result of two main military requirements. First, the military needs an all-service, highly mobile all-weather precision approach system, tailorable to a wide range of environments, from shipboard use to rapid installation at makeshift airfields. Second, they need a robust system that can maintain a high level of reliability in combat operations, particularly in its ability to effectively resist jamming.

==Operation==

JPALS encompasses two main categories: SRGPS and LDGPS. SRGPS provides highly accurate approach positioning for operations aboard ship, including aircraft carriers, helo and STO/VL carriers, and other shipboard operations, primarily, but not limited to, 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 portable, designed for relatively short-term, austere airfield operations. The Special Missions system is a highly portable system capable of rapid installation and use by [[Special Forces]].

==Accuracy==

The accuracy of LAAS, or [[Local Area Augmentation System]], is better than [[Instrument Landing System#ILS categories|CAT III ILS]] accuracy, and will provide horizontal and vertical resolutions of less than 1 m. Although the exact accuracy of JPALS will remain classified, it's estimated that JPALS will meet or exceed this accuracy for authorized users.

==Benefits==

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*[[Wide Area Augmentation System]]

*[[Precision approach]]

*[[Instrument Landinglanding Systemsystem]]

*[[Global Positioning System]]

*[[Differential GPS]]