Product truth

Gaseous attenuation currently uses the legacy P.676-10 closed-form approximation. It is not labelled or validated as the current P.676-13 Annex 1 line-by-line method.

Methodology & fidelity

Axiorad is a planning-grade radar coverage and RF propagation tool. Results are for site planning and comparative studies. They are not a substitute for field measurement, flight trial, or certified prediction for safety-critical decisions unless independently validated for your scenario.

Fidelity categories

The same labels appear in the Mission Inspector, results provenance, and exports.

  • Validated

    Compared against independent official reference vectors within a declared tolerance for the supported configuration space.

  • Planning-grade

    Suitable for site planning and comparative studies. Mechanisms are standards-based but not fully externally validated for every path.

  • Approximate

    Analytical or simplified implementation. Use for screening only; expect material error outside the documented domain.

  • Idealized

    Theoretical baseline that ignores terrain, clutter, and many real-world impairments. Not a prediction of field performance.

Propagation models

  • longley-riceValidated
  • itu-r-p1812Planning-grade
  • cost231-hataApproximate
  • two-rayApproximate
  • free-spaceIdealized
  • autoPlanning-grade

NTIA ITM WASM is compared against official NTIA example vectors via npm run validate:itm. ITU-R P.1812-6 requires a real terrain profile and is blocked for air-ground geometries. P.528 in the fallback chain is an analytical approximation, not the NTIA table set.

What leaves the browser

Coverage grids are computed in the browser by the authoritative CPU worker. Map tiles, elevation APIs, authentication (Clerk), and optional datasheet LLM parsing do contact external services. Do not treat Axiorad as fully air-gapped or as "data never leaves the browser" without reading the security page.

Related: Technology · Propagation models · Changelog