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intercept/docs/USAGE.md

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INTERCEPT Usage Guide

Detailed instructions for each mode.

Pager Mode

  1. Select Hardware - Choose your SDR type (RTL-SDR, LimeSDR, or HackRF)
  2. Select Device - Choose your SDR device from the dropdown
  3. Set Frequency - Enter a frequency in MHz or use a preset
  4. Choose Protocols - Select which protocols to decode (POCSAG/FLEX)
  5. Adjust Settings - Set gain, squelch, and PPM correction as needed
  6. Start Decoding - Click the green "Start Decoding" button

Frequency Presets

  • Click a preset button to quickly set a frequency
  • Add custom presets using the input field and "Add" button
  • Right-click a preset to remove it
  • Click "Reset to Defaults" to restore default frequencies

433MHz Sensor Mode

  1. Select Hardware - Choose your SDR type
  2. Select Device - Choose your SDR device
  3. Start Decoding - Click "Start Decoding"
  4. View Sensors - Decoded sensor data appears in real-time

Supports 200+ protocols including weather stations, TPMS, doorbells, and IoT devices.

WiFi Mode

  1. Select Interface - Choose a WiFi adapter capable of monitor mode
  2. Enable Monitor Mode - Click "Enable Monitor" (uncheck "Kill processes" to preserve other connections)
  3. Start Scanning - Click "Start Scanning" to begin
  4. View Networks - Networks appear in the output panel with signal strength
  5. Track Devices - Click the chart icon on any network to track its signal over time
  6. Capture Handshakes - Click "Capture" on a network to start handshake capture

Tips

  • Run with sudo for monitor mode to work
  • Check your adapter supports monitor mode: iw list | grep monitor
  • Use "Kill processes" option if NetworkManager interferes

Bluetooth Mode

  1. Select Interface - Choose your Bluetooth adapter
  2. Choose Mode - Select scan mode (hcitool, bluetoothctl)
  3. Start Scanning - Click "Start Scanning"
  4. View Devices - Devices appear with name, address, and classification

Tracker Detection

INTERCEPT automatically detects known trackers:

  • Apple AirTag
  • Tile
  • Samsung SmartTag
  • Chipolo

Aircraft Mode (ADS-B)

  1. Select Hardware - Choose your SDR type (RTL-SDR uses dump1090, others use readsb)
  2. Check Tools - Ensure dump1090 or readsb is installed
  3. Set Location - Choose location source:
    • Manual Entry - Type coordinates directly
    • Browser GPS - Use browser's built-in geolocation (requires HTTPS)
    • USB GPS Dongle - Connect a USB GPS receiver for continuous updates
    • Shared Location - By default, the observer location is shared across modules (disable with INTERCEPT_SHARED_OBSERVER_LOCATION=false)
  4. Start Tracking - Click "Start Tracking" to begin ADS-B reception
  5. View Map - Aircraft appear on the interactive Leaflet map
  6. Click Aircraft - Click markers for detailed information
  7. Display Options - Toggle callsigns, altitude, trails, range rings, clustering
  8. Filter Aircraft - Use dropdown to show all, military, civil, or emergency only
  9. Full Dashboard - Click "Full Screen Dashboard" for dedicated radar view

Note: ADS-B auto-start is disabled by default. To enable auto-start on dashboard load, set INTERCEPT_ADSB_AUTO_START=true.

Emergency Squawks

The system highlights aircraft transmitting emergency squawks:

  • 7500 - Hijack
  • 7600 - Radio failure
  • 7700 - General emergency

ADS-B History (Optional)

The history dashboard persists aircraft messages and per-aircraft snapshots to Postgres for long-running tracking and reporting.

Enable History

Set the following environment variables (Docker recommended):

Variable Default Description
INTERCEPT_ADSB_HISTORY_ENABLED false Enables history storage and reporting
INTERCEPT_ADSB_DB_HOST localhost Postgres host (use adsb_db in Docker)
INTERCEPT_ADSB_DB_PORT 5432 Postgres port
INTERCEPT_ADSB_DB_NAME intercept_adsb Database name
INTERCEPT_ADSB_DB_USER intercept Database user
INTERCEPT_ADSB_DB_PASSWORD intercept Database password

Other ADS-B Settings

Variable Default Description
INTERCEPT_ADSB_AUTO_START false Auto-start ADS-B tracking when the dashboard loads
INTERCEPT_SHARED_OBSERVER_LOCATION true Share observer location across ADS-B/AIS/SSTV/Satellite modules

Local install example

INTERCEPT_ADSB_AUTO_START=true \
INTERCEPT_SHARED_OBSERVER_LOCATION=false \
python app.py

Docker example (.env)

INTERCEPT_ADSB_AUTO_START=true
INTERCEPT_SHARED_OBSERVER_LOCATION=false

Docker Setup

docker-compose.yml includes an adsb_db service and a persistent volume for history storage:

docker compose --profile history up -d

To store Postgres data on external storage, set PGDATA_PATH (defaults to ./pgdata):

PGDATA_PATH=/mnt/usbpi1/intercept/pgdata

Using the History Dashboard

  1. Open /adsb/history
  2. Use Start Tracking to run ADS-B in headless mode
  3. View aircraft history and timelines
  4. Stop tracking when desired (session history is recorded)

Satellite Mode

  1. Set Location - Choose location source:
    • Manual Entry - Type coordinates directly
    • Browser GPS - Use browser's built-in geolocation
    • USB GPS Dongle - Connect a USB GPS receiver for continuous updates
  2. Add Satellites - Click "Add Satellite" to enter TLE data or fetch from Celestrak
  3. Calculate Passes - Click "Calculate Passes" to predict upcoming passes
  4. View Sky Plot - Polar plot shows satellite positions in real-time
  5. Ground Track - Map displays satellite orbit path and current position
  6. Full Dashboard - Click "Full Screen Dashboard" for dedicated satellite view

Adding Satellites from Celestrak

  1. Click "Add Satellite"
  2. Select "Fetch from Celestrak"
  3. Choose a category (Amateur, Weather, ISS, Starlink, etc.)
  4. Select satellites to add

Remote Agents (Distributed SIGINT)

Deploy lightweight sensor nodes across multiple locations and aggregate data to a central controller.

Setting Up an Agent

  1. Install INTERCEPT on the remote machine
  2. Create config file (intercept_agent.cfg): 
    [agent]
name = sensor-node-1
port = 8020

[controller]
url = http://192.168.1.100:5050
api_key = your-secret-key
push_enabled = true

[modes]
pager = true
sensor = true
adsb = true
  3. Start the agent: 
    python intercept_agent.py --config intercept_agent.cfg

Registering Agents in the Controller

  1. Navigate to /controller/manage in the main INTERCEPT instance
  2. Enter agent details:
    • Name: Must match config file (e.g., sensor-node-1)
    • Base URL: Agent address (e.g., http://192.168.1.50:8020)
    • API Key: Must match config file
  3. Click "Register Agent"
  4. Use "Test" to verify connectivity

Using Remote Agents

Once registered, agents appear in mode dropdowns:

  1. Select agent from the dropdown in supported modes
  2. Start mode - Commands are proxied to the remote agent
  3. View data - Data streams back to your browser via SSE

Multi-Agent Streaming

Enable "Show All Agents" to aggregate data from all registered agents simultaneously.

For complete documentation, see Distributed Agents Guide.

Configuration

INTERCEPT can be configured via environment variables:

Variable Default Description
INTERCEPT_HOST 0.0.0.0 Server bind address
INTERCEPT_PORT 5050 Server port
INTERCEPT_DEBUG false Enable debug mode
INTERCEPT_LOG_LEVEL WARNING Log level (DEBUG, INFO, WARNING, ERROR)
INTERCEPT_DEFAULT_GAIN 40 Default RTL-SDR gain

Example: INTERCEPT_PORT=8080 sudo -E venv/bin/python intercept.py

Command-line Options

python3 intercept.py --help

  -p, --port PORT    Port to run server on (default: 5050)
  -H, --host HOST    Host to bind to (default: 0.0.0.0)
  -d, --debug        Enable debug mode
  --check-deps       Check dependencies and exit
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