GPS-IU
Abstract
Global Positioning System Interface Unit (GPS-IU) is considered an FY22 new start due to program schedule delays. The GPS-IU integrates GPS Position, Navigation and Timing (PNT) data into navigation, communications, and weapons systems on board the B-52. The GPS-IU acts as a controller for a MIL-STD-1553 data bus communications path. The major areas of support include GPS interface control and monitoring, targeting pod functions, navigation displays for the Pilot and Copilot stations, and Identification Friend or Foe (IFF) control functions. Originally developed with a 33MHz processor with 4MB of Static Random Access Memory (SRAM), the GPS-IU has become overloaded as more software has been added to the B-52. Currently operating at 86 percent throughput capacity and at 90 percent memory capacity, exceeding the designated safety threshold of 95 percent memory load in 2019. The GPS-IU is also facing parts obsolescence issues. The upgrade will improve system reliability and address Diminishing Manufacturing Sources and Material Shortages (DMSMS) issues on subcomponents of the GPS-IU. The modified GPS-IU will retain the existing functions and interfaces of the legacy GPS-IU, and provide additional interfaces to allow for future growth requirements, including two Ethernet Ports and two connectors on the face-plate for future growth. GPS-IU requires upgrading to incorporate any other GPS dependent capabilities on the B-52 platform. B-52 fleet will have the capability to carry additional GPS dependent weapons and targeting pods, and the increased capacity to incorporate future GPS-dependent capabilities beyond 2018. The GPS-IU upgrade program will provide increased throughput and memory capacity by replacing the current GPS IU Line Replaceable Unit (LRU). The new LRU will contain the necessary associated electronics to allow for increased processor throughput, more memory, and sustainable electronic packages. The new LRU contains 7 Circuit Card Assemblies (CCA) which include a Backplane CCA, Front panel CCA, Power Supply CCA, Ethernet Switch CCA, Single Board Computer CCA with 1553/429 daughter card, Graphics card CCA and I/O CCA. The I/O card combines the functions of three of the legacy IU Circuit Cards (Discrete Inputs Analog, Audio Video (DAAV), Discrete Outputs (DOA) and Serial Busses functionality) The Backplane and Motherboard will require an upgrade to integrate these new CCAs. This upgrade will improve system reliability while also addressing Diminishing Manufacturing Sources and Material Shortages (DMSMS) issues that exists for the legacy GPS-IU. Funds may be used to address emerging and short-notice DMSMS, Development Testing (DT)/ Operational Testing(OT) issues, resolving emerging safety of flight and diminishing manufacturing sources issues, accommodate technology insertion and fulfill Federal Aviation Agency (FAA) or other mandates necessary to ensure continued aircrew safety and mission effectiveness. DMS efforts to include removal of end-of-life software/hardware within simulators systems and move to a modular, common open system architecture that is sustainable and cyber-resilient. Implement requirements and standards defined under the Simulator Common Architecture Requirements and Standards (SCARS) initiative.
Document Details
- Document Type
- Project
- Publication Date
- Oct 01, 2022
- Source ID
- 675055_0101113F_7_3600_PB_2022
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