FAST is a comprehensive GNSS data processing solution developed in Python 3.12, offering both GUI and CLI interfaces for users of all levels. Built on PyQt5 with modular architecture, it provides seamless integration with scientific computing workflows.The software adopts a modular architecture, consisting of 4 modules: (1) data download, (2) quality analysis, (3) Single Point Positioning, and (4) station selection.

$ ./FAST
$ ./FAST [options]

Simply double-click the application

• Multi-threaded GNSS data downloading with automatic queue management
• Intelligent local duplicate detection and file validation
• Automated post-processing:
  • Decompression
  • Format conversion
  • File concatenation
  • Standardized renaming

• Comprehensive RINEX file diagnostics:
  • Satellite observation counts and availability
  • Pseudorange & carrier phase noise analysis
  • Cycle slip detection and statistics
  • Ionospheric delay variation rates
• Interactive visualization of quality metrics

• Dual-frequency ionosphere-free pseudorange positioning
• Multi-GNSS constellation support:
  • GPS
  • BDS
  • Galileo
• Beginner-friendly interface with one-click processing
• Exportable results in multiple formats

• Flexible filtering options:
  • By satellite system
  • By antenna/receiver type
  • Geographic bounding box
  • Temporal sampling rate
• Visual map interface for spatial selection
• Downsampling capability for large datasets

Complete user manual: ./manual/FAST_manual-V3.00.docx