go2DECODE Features


Workflow

go2DECODE contains all the tools for the signal specialist to decode and analyse signals.

Two workflows are possible

Known signals with existing decoder

  1. Prepare decoder list
  2. Tune receiver or DANA to bring the signal in the center of the display
  3. Automatic recognition and decoding

Unknown signals with existing decoder

  1. Tune receiver or DANA to bring the signal in the center of the display
  2. Record it if no recording exists
  3. Define time range to be analyzed
  4. Analyse the signal to find the modulation parameters (requires know how about modulation and protocols)
  5. Setup a demodulator
  6. Analyze the bit stream, maybe re-use an existing decoder
  7. Try to find information about the protocol
  8. Or write a complete new decoder (requires programming know how and a lot of time

Basic Functions

Recognition and Decoding

Workflow

go2DECODE’s signal detection and production is a multi-level process. go2DECODE buffers the incoming signal continuously. Buffering allows loss-less demodulation in time respect. go2DECODE checks the signal for the predefined modem types in the steps:

  • detection
  • recognition
  • demodulation and decoding.

Signal characteristics (e. g. center frequency and symbol rate) are determined and displayed. Decoded text will be displayed as plain text or as a formatted XML-stream.
Because of this multi-level process a modulation classification, a modem recognition and a complete production can be realized with go2DECODE. Thus even incomplete processing steps lead to partial results. Quality criterion's of all results are calculated and displayed.
For best results, code aided and soft-decision decoders are implemented in some decoders.

Processing of Voice Signals

A powerful voice detection module is integrated. The voice processing algorithms of go2DECODE are insensitive to interference's like wideband interference caused by a thunderstorm.
The sensitivity level itself can be parameterized. In addition to the decision “voice yes or no” the module determines the values for nominal frequency, voice pitch and modulation type.
The voice transmission can be demodulated and stored in audio files for listening and further processing. All this is done in real-time and tailored to the typical COMINT signal scenario.

Recording

Besides demodulation and decoding of radio signals, signal recording is an important application in daily use. The signal recording not only provides the material for the manual technical analysis of unknown signals, but also for archiving the signals of interest. go2DECODE allows recording of both IF and AF during demodulation.
The recordings are started and stopped either via automatic triggers or manually by the operator. The triggers supported by go2DECODE are;

  • Configurable squelch
  • Signal detection
  • Modem recognition
  • Voice detection

go2DECODE can record the demodulated bit stream into a txt file or into a special go2DECODE file format that contains additional metadata such as the quality of each bit.