Dear SEAMCAT users and STG members,

Introducing the New Official Release of SEAMCAT Tool 5.5.1 !

The official version SEAMCAT v.5.5.1 is released on 8th October 2025.

The latest version marks a significant milestone in the evolution of CEPT's spectrum engineering tool, unleashing a plethora of enhancements and 32 new features aimed at improving your spectrum interference studies. You can download the tool, access online Handbook and get much more information about tool and the SEAMCAT Community at the SEAMCAT page.

You can find all relevant information about SEAMCAT Tool at https://www.seamcat.org/, or directly download SEAMCAT v.5.5.1 here.

🚀 SEAMCAT v5.5.1 – Comprehensive Feature Overview:

🧠 Simulation & Scenario Enhancements

• Location-Time Simulation Framework: Locking distribution values after the first event, fixing interference link positions, replaying events, and GUI indicators.
• Fixed Geographical Coordinates for ISL: New option for correlated mode in scenario configuration.
• Simulation Time Optimization: Skipping inactive links based on Tx Power or activity factor.
• BEL ITU-R P.2109 Integration: Fixing after first event in location/time-dependent simulations.
• Activity Factor Fixes: Correct handling of transmitters at event 0.

📡 Propagation Models & Terrain

• New PMP Models: Full implementation of ITU-R P.452-18 and P.368-10 with GUI, transmission loss methods, and unit tests.
• Clutter Height Profile Integration: Using DSM + DTM and DTM + DLU data for ITU-R P.452-18 calculations.
• Digital Land Use Data: Corine Land Cover reader with clutter height extraction and ITU mapping.
• GeoTIFF Terrain Reader: Support for finer resolution (10, 20, 50 m) and TIFFs without reference coordinates.
• DTM - SRTM *.hgt Reader: Inclusion of hgt terrain profiles in simulations.
• Tool for Propagation Model Testing: Set geo-coordinates for Tx/Rx and visualize terrain path profile.
• Adding ITU-R P.2108 clutter loss model calculation to indoor local environment

📶 Cellular System Improvements

• Advanced UE Positioning Distributions: Lognormal, Rayleigh (distance), and Normal (azimuth) for IMT-2020 and OFDMA (DL & UL).
• Enhanced Cellular Results: SINR, Bitrate vectors, reference cell data, and reorganized result tabs.
• Estimate Coupling Loss Percentile (CLP) Fixes: For IMT-2020 and OFDMA uplink systems.

🛠️ EPP, Tooling & Command Line

• Implementation of Fractional Degradation in performance calculation from ECC Report 367 as an eEPP
• Multiple PMP Management: Export/import PMP configurations to/from the library.
• Command Line XPath Support: Query result files, extract values, and apply logical operators.
• Batch Tool Enhancements: Save-as functionality and improved result exports.

📥 User Experience & Interface

• Simplified Download Process: Licensing terms accepted on first run.
• GUI Enhancements: Visual indicators for locked distributions, antenna plot improvements, and tooltips.

📜 Release Notes: For a comprehensive overview of all implemented changes and enhancements, check out our Release notes with detailed descriptions and source control links.

This achievement wouldn't have been possible without the immense contributions from CEPT members, SEAMCAT users, STG members, the development team, and ECO. Your dedication and collaboration have been instrumental in advancing SEAMCAT's capabilities and making it a go-to tool for spectrum engineering.

Download the latest version, delve into the online Handbook, and engage with the SEAMCAT Community on our SEAMCAT page.

Thank you for being an essential part of SEAMCAT's journey towards continuous improvement and innovation.

SEAMCAT_5.5.1_OFFICIAL_RELEASE_NOTE__20251006_.pdf