In the Army, we have recognized that PNT is a critical enabler of our war- fighting capability, and that GPS is the predominant materiel solution that we rely upon. Te Army has integrated GPS receivers into most technology-based warfighting systems, such as Stryker, Nett Warrior, Rifleman Radio, the M777 how- itzer and many others. Tese systems depend on PNT to varying degrees for some aspect of their functionality, from precise time to enable communications networks to precise positioning for tar- geting. Te challenge presented to the product director for PNT (PD PNT), under the project manager for terrestrial sensors in the Program Executive Office for
Intelligence, Electronic Warfare &
Sensors (PEO IEW&S), is to ensure the integrity of PNT and access to it for these dependent systems. Tus the Army can be confident of a resilient PNT capabil- ity as technological threats continue to increase—in other words, assured PNT.
PNT SYSTEM-OF-SYSTEMS ARCHITECTURE
Te establishment of the Army PNT Sys- tem of Systems Architecture (SoSA) is a key part of the Army strategy to achieve assured PNT. Te Hon. Heidi Shyu, the Army acquisition executive, directed the establishment of the PNT SoSA and the accomplishment of three objectives:
1. Stay ahead of the PNT threat. 2. Increase efficiencies and eliminate redundancies.
3. Provide an affordable migration path to M-code.
Te first objective is focused on enabling an affordable, open systems architecture that is flexible enough to accommodate additional capabilities without incurring expensive system or platform integration and certification costs—a framework that enables a pathway for future innovation.
POSITIONED FOR ACTION
A Fairchild Republic A-10 Thunderbolt II banks toward Air National Guard joint terminal attack controllers and Soldiers assigned to the 5th Squadron, 1st Cavalry Regiment, 1st Stryker Brigade Combat Team, U.S. Army Alaska, training at Yukon Training Area, AK, Aug. 20, 2014, during the Red Flag-Alaska 14-3 exercise. PNT SoSA is a key part of the Army strategy to achieve assured PNT, which underpins navigation and battlefield communication. (U.S. Air Force photo by Justin Connaher)
An analogy is the “IT box” concept, with a framework to add additional hardware and software in the future without impact- ing interfaces and end functionality. An example of this is the PNT Hub, under development in the Assured PNT pro- gram—a capability that allows the Army to control the level of PNT assurance through software and hardware configura- tions, seamless to the platform. Te PNT Hub will enable integration of innovative technologies such as the Chip Scale Atomic Clock (CSAC), which harnesses the stable oscillations of the cesium atom to preserve
precise time, even in the absence of GPS. In the future, when an engineer creates a novel means to determine positioning and timing, there will be an affordable pathway to insert this technology into a PNT SoSA compliant product.
Te second objective—increase efficien- cies
and eliminate redundancies—is
simple, using the Stryker platform as an analogy. Each of the 10 different func- tional variants of the Stryker employs a mix of supporting electronics, from the Force XXI Battle Command Brigade and
ASC.ARMY.MIL 87
SCIENCE & TECHNOLOGY
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