InmarScope

Decode the Satellites. Follow the Voice.

InmarScope is a modern desktop application for decoding Inmarsat L-band satellite traffic using affordable SDR hardware. Designed for aviation, maritime, and SDR enthusiasts alike, it combines Aero, Inmarsat-C, EGC, and voice monitoring into a single high-performance native application.

Built as a unified alternative to tools like JAERO and Scytale-C, InmarScope brings together multi-channel decoding, live spectrum analysis, structured message output, and automated voice-call following in one streamlined interface.

Automatic Voice-Call Following

Inmarsat Aero voice calls dynamically move across the band. InmarScope automatically follows them in real time.

As soon as a voice-channel assignment appears on the control channel, the application retunes, locks onto the assigned carrier, decodes the audio, and returns when the call ends — fully automated.

Voice-Follow Features

• Automatic voice-channel tracking and retuning
• One-SDR mode with automatic hopping between control and voice channels
• Two-SDR mode with dedicated voice monitoring
• Live split-view spectrum and waterfall displays
• Automatic frequency correction and lock management
• Per-call WAV recording with timestamped organization
• Real-time AMBE voice playback

Multi-Channel Satellite Decoding

InmarScope uses a shared DSP channelizer and multi-threaded worker architecture to decode multiple services simultaneously.

Supported modes include:

Decoded traffic is organized into dedicated views for:

• ACARS messages
• Signal units
• C-channel assignments
• Network and satellite discovery
• Maritime safety broadcasts
• EGC message streams

Live Spectrum & Signal Analysis

InmarScope provides a fully interactive RF monitoring environment built specifically for L-band satellite work.

Features

• Frequency-aligned spectrum and waterfall displays
• Smooth band browsing with automatic retuning
• FFT sizes up to 65,536 points
• Click-to-decode signal placement
• Drag-to-tune decoder positioning
• Real-time constellation monitoring
• High-resolution carrier visualization

The interface is designed for active monitoring, allowing users to explore the entire band without constantly adjusting SDR center frequencies manually.

SDR Hardware Support

InmarScope supports a range of SDR devices and networked radio sources.

Supported Inputs

• RTL-SDR with independent bias-tee control
• HackRF with full gain and amplifier configuration
• SDR++ Server remote streaming
• WAV IQ playback for offline decoding and analysis

Remote SDR++ Server integration also supports live sample-rate control directly from the application.

Data Export & Integration

Decoded traffic can be streamed or logged using formats already familiar to the SDR and ACARS communities.

Export Options

• JSON output compatible with Acarshub pipelines
• JAERO-style text logging
• UDP streaming for custom dashboards and tooling
• Inmarsat-C / EGC structured message output
• File-based logging and archival

Built for Continuous Monitoring

InmarScope is engineered as a fast, native desktop application focused on reliability and long-term monitoring performance.

Highlights

• Native Windows and Linux support
• Multi-threaded decoding architecture
• Low-drop, high-throughput DSP pipeline
• Integrated audio playback and recording
• Clean single-window interface
• Built-in update notifications

Designed For

InmarScope is built for:

• SDR enthusiasts
• Aviation and maritime radio hobbyists
• Satellite monitoring operators
• SIGINT researchers
• ACARS and EGC observers
• RF experimentation and analysis

It delivers a unified platform for monitoring Aero and Inmarsat-C traffic — with automated voice following that sets it apart from existing tools.