Engineering software, built by engineers — for the people designing the next layer of connectivity.
Most RF engineering teams working on HAPS and NTN today rely on one of three options: legacy satellite tools that assume orbital geometry, terrestrial planning tools that assume ground-level propagation, or spreadsheets that break the moment requirements scale. None of these were built for stratospheric platforms operating at 18–25 km altitude with the specific geometric, Doppler, and atmospheric profiles that HAPS demands.
HAPIS exists to close that gap with software that is purpose-built, standards-compliant, and verifiable. Every calculation is traceable to its source ITU-R or 3GPP standard, every model is validated against published reference cases, and every output is designed to be auditable by the engineers who depend on it.
HAPIS was founded by Oswaldo Hernández Arrambide, an aerospace engineer with a Master of Science in Telecommunications. His work focuses on RF propagation engineering and on the ITU-R and 3GPP standards bodies that govern modern HAPS and Non-Terrestrial Network design.
He founded HAPIS to bring purpose-built, standards-compliant link-budget software to the engineers and researchers designing the next generation of stratospheric connectivity.
Every numerical output of the HAPIS engine maps to a named, versioned recommendation.
| ITU-R P.525 | Free-space path loss |
| ITU-R P.676 | Atmospheric gas absorption (oxygen and water vapour) |
| ITU-R P.838-3 | Specific attenuation model for rain |
| ITU-R P.840 | Cloud and fog attenuation |
| ITU-R P.2108 | Clutter loss |
| 3GPP TR 38.811 | NR support for non-terrestrial networks |
| 3GPP TR 38.821 | Solutions for NR to support NTN |
| 3GPP TR 38.822 (draft) | NR support for high-altitude platform stations |
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