Global Positioning Systems (GPS) and Global Navigation Satellite Systems (GNSS)

1. Major GNSS Constellations
   1. Global Positioning System (GPS)
      1. System Overview
      2. Constellation Configuration
      3. Signal Structure
      4. Control Segment Operations
      5. Modernization Program
         1. Block IIF Satellites
         2. Block III Satellites
         3. New Civil Signals
         4. Enhanced Capabilities
   2. GLONASS
      1. System Architecture
      2. FDMA Signal Structure
      3. Constellation Maintenance
      4. Modernization Efforts
      5. GLONASS-K Satellites
   3. Galileo
      1. European System Design
      2. Service Categories
         1. Open Service
         2. High Accuracy Service
         3. Commercial Authentication Service
         4. Public Regulated Service
         5. Search and Rescue Service
      3. Signal Plan
      4. Ground Segment Infrastructure
   4. BeiDou Navigation Satellite System
      1. System Evolution
         1. BeiDou-1 Experimental System
         2. BeiDou-2 Regional System
         3. BeiDou-3 Global System
      2. Constellation Design
      3. Service Categories
      4. Signal Characteristics