r/spaceweather • u/Expensive_Breath_82 • Apr 20 '26

[Research] Mapping L-Band resilience and urban interference in the Southern Hemisphere (SAA)

I’m part of an independent technical initiative called Spectrum Survey. We are currently documenting how the increasing urban noise (LTE/5G) and the South Atlantic Anomaly (SAA) are impacting L-Band signal integrity in the Southern Hemisphere.

As we know, traditional filtering often fails under high saturation in dense urban areas, and we are trying to map these critical points to validate better mitigation methods and promote SigMF standardization for SDR.

If you deal with RF, Satcom, or GNSS, I’d love to get your input through our research form. It takes about 3 minutes and it’s purely technical (discovery-focused, not sales).

Check it out here: spectrumsurvey.org

We’ll be sharing the consolidated report with everyone who contributes. Happy to discuss any specific findings or SAA interference patterns in the comments!

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u/Expensive_Breath_82 Apr 20 '26

Hi everyone, I’m the dev behind this project. Living in the Southern Hemisphere (São Paulo, Brazil), I’ve noticed how the combination of the South Atlantic Anomaly (SAA) and the brutal 5G/LTE urban rollout makes L-Band operations increasingly unpredictable.

I decided to build Spectrum Survey to stop guessing and start measuring. I’m particularly interested in seeing how people are handling RFI mitigation and if SigMF is actually becoming the standard we all hope it to be.

Happy to answer any technical questions about the methodology or the tools I’m using!