twnoaa | Weather Satellite Image Reception & AI Weather Analysis Tool

💡 Product Overview

"twnoaa (T-W Noah)" is a desktop application that directly captures radio signals transmitted from weather satellites orbiting at approximately 850 km altitude and the International Space Station (ISS) using a USB software-defined radio (RTL-SDR), and automates everything from signal processing (DSP) and image decoding to weather explanation via multimodal AI in a single integrated workflow.

Unlike the traditional approach of complexly coordinating multiple specialized software tools (orbital calculation software, SDR reception software, virtual audio, image decoders, etc.), this single app completes the experience of "receiving Earth's images directly from space."

Even if you don't have the hardware (RTL-SDR) on hand, you can immediately experience the entire workflow from signal generation through image decoding and AI analysis using the built-in simulation mode.

✨ Key Features and Characteristics

• 🛰️ Automatic Satellite Orbital Calculation & 3D Globe Tracking
  The built-in SGP4 engine retrieves the latest orbital elements (TLE) from CelesTrak. It automatically calculates the date/time of passage over your observation point, azimuth, maximum elevation angle, and Doppler shift, visualizing them in real-time on an interactive 3D globe.
• 📻 Direct RTL-SDR Control & Real-time DSP
  Direct control of SDR hardware via librtlsdr (also supports Bias-Tee 4.5V coaxial power supply switching for LNA). Monitor radio waves from space in real-time with high-speed FFT spectrum and waterfall display.
• 🖼️ Multi-Protocol Image Decoding (METEOR / NOAA / SSTV)
  * METEOR-M2 (LRPT): High-definition color weather image restoration through digital QPSK demodulation and error correction
  * NOAA (APT): Visible light and infrared dual-channel image restoration through analog FM demodulation
  * SSTV: Slow-scan television image decoding from the International Space Station (ISS) and other sources
• 📡 ISS (International Space Station) APRS Packet Reception & Map Integration
  Real-time demodulation of 1200 bps AFSK / AX.25 packets transmitted from ISS (ARISS). Automatically analyzes callsigns and grid locators, plotting ground stations on Google Maps, aprs.fi, or the 3D globe with a single click.
• 🤖 Multimodal AI Weather Analysis (+ Detective Cat Animation)
  Sends restored satellite images and reception metadata to AI (Google Gemini / OpenAI / Anthropic Claude / local Ollama). Automatically explains cloud patterns, fronts, and low-pressure cyclones, and you can also ask questions via chat (a cute cat character entertains you with detective-style animations during analysis).
• 🌐 Cross-Platform & Bilingual Japanese/English Support
  Built with Wails (Go language) + Svelte 5, it runs smoothly on Windows / macOS / Linux. The UI and AI explanations fully support switching between Japanese and English.

🛠 Recommended For

• Those interested in software-defined radio (SDR), amateur radio, and receiving radio signals from weather satellites and the ISS
• Those who have given up on configuring multiple radio software and want to enjoy satellite reception easily with an all-in-one solution
• Those who want to experience an app combining physical devices (SDR) × Go language × generative AI (※ You can try it in simulation mode even without equipment!)

🔗 Related Links

• 公式ドキュメント・使い方ガイド（GitHub Pages）
• GitHub リポジトリ / 最新版ダウンロード（Releases）