Abstract
Satellite imaging is widely used in monitoring weather patterns and interpreting satellite images. The limited access to weather satellite image data in real-time is still major issues faced by satellite enthusiasts. NOAA 18 and NOAA 19 weather satellites provide free accessible weather data continuously through Automatic Picture Transmission at 137.9125 MHz and 137.1000 MHz frequencies. In this research the data acquisition system is designed with the help of a Quadrifilar Helix antenna and RTL-SDR. In order to receive both frequencies, the Quadrifilar Helix antenna at 137,5 MHz is designed. Recording, decoding, editing, and viewing of Automatic Picture Transmission signals using WXtoImg software. The result showed that the weather satellite image receptions are sufficiently clear and descriptive, although there are 0.0685% frequency offsets of Automatic Picture Transmission signal reception on NOAA 18 and 0.0686% on NOAA 19.
Highlights
Access to obtain local weather satellite image data in real-time is still very limited and difficult to decode the hidden information contained in it
The APT signals transmitted by NOAA satellites are RHCP (Right Handed Circularly Polarized), so it takes an RHCP type antenna to produce a good signal reception [3][4][5]
This paper focuses on hardware and software implementation to receive and decode the APT signal on NOAA 18 and NOAA 19 weather satellites
Summary
Access to obtain local weather satellite image data in real-time is still very limited and difficult to decode the hidden information contained in it. The APT (Automatic Picture Transmission) signal which can be accessed by the public makes NOAA weather satellite an alternative choice to get weather satellite image data. The NOAA weather satellite carries five types of sensors, one of which is the AVHRR (Advanced Very High-Resolution Radiometer) [2]. This paper focuses on hardware and software implementation to receive and decode the APT signal on NOAA 18 and NOAA 19 weather satellites. The ideal antenna type for APT receiver at 137 MHz is the QFH antenna (Quadrifilar Helix) [6][7][8]. Many SDR devices used as NOAA weather satellite receivers [10][11][12]. This SDR uses Realtek® RTL2832U as the controller and Rafael Micro® R820T2 as the tuner
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