Modernization of Nii Jima Transmitter Control

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Modernization of Nii Jima Transmitter Control

• Presented by Michael Weisenbloom

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Goals and Objectives

• Reduce cost of ownership
• Remote capability for unattended transmitter
  operation
• Modern, reduced component count for greater
  reliability and tighter integration
• Improve operator control and interface
• Graphical user interface display and control at
  local and remote locations
• Time synchronization to UTC-USNO via built-in GPS

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Goals and Objectives

• Provide easy upgrade path for current systems
• Existing transmitter cables and equipment fully
  compatible
• Fits in existing footprint and power requirements
  
• Provide for future upgrades and growth
• Flexible system architecture with embedded
  software and programmable hardware, each with
  designed in reserve
• Commercial off-the-shelf modules and
  subcomponents

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Transmitter Control System Diagram
Nii Jima Replace 4 rack Control Console Unit with
new 3 rack software controlled Transmitter
Control Unit
Chiba Replace 1 rack Remote Control Unit rack
with PC workstation and graphical remote control
software
Time sync to UTC via built-in GPS
New graphical display and user interface
Remote networked interface for unattended
transmitter operation
NTT lease line network
Direct connection to existing transmitter cables
UPS and battery backup
Redundant PC workstation with UPS back-up
Similar installation upgrades also planned for
Gesashi and Tokatibuto stations in NW Pacific
chain for 2003 and 2004
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Transmitter Control Unit

• Replace existing CCU with new Transmitter Control
  Unit (TCU)
• 3 Rack System
• Modern off-the-shelf parts
• Software and graphical user interface control
• UPS and battery backup
• Ethernet/HUB interface to NTT leased network for
  Chiba remote control

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Loran Timer Subsystem (LTS)

• Loran Timer Assemblies
• Generates Loran pulse timing (MPTs)
• UTC Sync Assemblies
• Provides UTC synchronized timing source from GPS

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Loran Timer Assembly (LTA)

• Generates dual-rate Loran pulse timing
• Automatic detection and adjustment of transmitted
  pulse reference
• Local and remote user controlled phase adjust
• Single board design with embedded software and
  logic
• 19 wide by 3U rack mounted assembly

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UTC Sync Assembly

• Cesium clock synchronization to GPS UTC
• Time-of-coincidence generation and error checking
• Time-of-day setting and error checking with
  external GPS
• Single board design with embedded software and
  logic
• 19 wide by 2U rack mounted assembly

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Loran Timer Subsystem Interconnect Diagram
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Transmitter Control Subsystem (TCS)
TCC (Transmitter Control Console) 1
TCC (Transmitter Control Console) 2
Redundant Transmitter Control Consoles
Alarm/Status Panel
Cable Connector Assembly (CCA)
Touchscreen Display
Retractable Keyboard Tray
TCA (Transmitter Control Assembly)
AC Input Power Phase Switcher
Fan Assembly
UPS
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Chiba Control Workstation for Nii Jima

• Install new control workstation at Chiba
• Remote operator control of Nii Jima TCU and
  transmitter
• Graphical user interface
• Ethernet/HUB interface to NTT leased network