Artifacts

Introduction

In SatNOGS project, Artifacts are the results of an observation. Artifacts are generated by SatNOGS GNU Radio Flowgraphs. A quick introduction on SatNOGS Flowgraphs can be found in Understanding_satnogs-flowgraphs guide.

Current Artifacts

I/Q Data

I/Q Data is a raw representation of the received signal. In SatNOGS project, it can be generated by SatNOGS client when the related flag is set (it is disabled by default). I/Q data, currently, are not uploaded in SatNOGS Network, however individual station owners keep and/or uploading I/Q data in other platforms.

Waterfall

Waterfall is a representation of frequency spectrum over the time of the observation. Waterfall covers a range of frequencies around the central frequency of the observation. In SatNOGS Network, Waterfall can be found in waterfall tab of an observation in an image file format.

Audio

Audio is a lossy compression of the I/Q Data artifact in a format that is audible. In some cases audio can be used for demodulating/decoding signal with external software. In SatNOGS Network, Audio can be found in audio tab of an observation in a .ogg file format presented by waveform and spectrogram.

Demodulated/Decoded Frame

Demodulated/Decoded Frame is the result of demodulation/decoding of a transmitted signal of a satellite. In SatNOGS Network, Demodulated/Decoded Frame can be found in data tab of an observation in a text of hex values format.

Decoded Image

Decoded Image is the result of decoding of an image transmitted by a satellite. In SatNOGS Network, Decoded Image can be found in data tab in an image file format.