Is there a harbor or airbase in your area?
These patterns look like radio frequency interference (RFI). Here you can find some examples
- Stripes near Copenhagen
- Sentinel-1 SAR VV backscattering
- Sentinel-1 noise - can it be removed?
- Noise objects in Sentinel-1 GRD data
You can see multiple examples of interesting effects in these slides: Radiometric artifacts on SAR images - ppt download