HMAA — Hierarchical Mission Authority Architecture: Technical Assurance Report v2.4.2

HMAA (Hierarchical Mission Authority Architecture) is a deterministic authority-management framework for autonomous systems operating in safety-critical and contested environments.

This deposit contains the HMAA Technical Assurance Report v2.4.2, which specifies and evaluates an authority engine that computes a scalar authority value A ∈ [0,1] from four inputs:

• Q: operator quality

• C: context confidence

• E: environmental threat

• τ: sensor trust

The engine uses a multiplicative base × gate × damping × τ structure with an Environmental Warning (EW) hysteresis state machine and a five-tier authority classification (T0–T4). The report includes:

• A complete, self-contained piecewise mathematical specification of the engine (eng()), sufficient for independent re-implementation

• Explicit EW hysteresis rules and dynamic weighting under EW

• A deterministic boundary test suite (10 test vectors) covering invariant boundaries, EW thresholds, and guard behavior

• Monte Carlo simulations with reproducible CLI commands and a fixed canonical seed

• A formal safety assurance case (hazards H1–H5b), plus an FMEA and threat model

• An Evidence Register mapping claims to CLI runs and content-stable SHA-256 hashes (excluding timestamp/run_id)

Scope / limitations: This is a software model and simulation report (not a certified flight computer). Safety properties are empirically validated using Monte Carlo tests plus deterministic boundary vectors; formal proof and hardware-in-the-loop validation are listed as future work.

How to reproduce (high level): The report provides command-line invocations for the core scenarios (CI gate, adversarial Monte Carlo, EW hysteresis stress, nominal scenario) and expected summary statistics.