Autonomous Kinetic Interceptor (SysML v2)

PACE-Hardened Guidance, Navigation, and Control (GNC) Architecture for Counter-UAS.

Executive Summary

This repository contains the authoritative system architecture for a high-velocity kinetic interceptor drone (DIU-Blue-UAS Class). Unlike traditional "Happy Path" architectures, this design implements a PACE-Hardened fault tolerance strategy. It features autonomous "Curved Coasting" (Predictive Guidance) to maintain intercept trajectories even when optical locks are lost due to sun glare or occlusion.

Critical safety features include Brownout Protection, which throttles propulsion to preserve avionics voltage during high-G maneuvers, and a Latent-Aware Guidance Loop tuned to account for the calculated ~196ms sensor-to-fin latency stack.

Key Features

• PACE Architecture: A robust state machine governing Primary (Intercept), Alternate (Coast), Contingency (Search), and Emergency (Termination) modes.
• Hysteresis Logic: "Sticky" state transitions that prevent mode flickering during edge-case sensor saturation (e.g., oscillating between 89% and 91% confidence).
• Predictive "Blind" Guidance: Utilizes an Extended Kalman Filter (EKF) to estimate target acceleration (az_Accel), allowing the drone to continue a curved intercept path during temporary sensor blindness.
• Safety Critical Isolation: Distinct logic gates for Flight Termination Systems (FTS) based on battery criticality (<18V) or Geofence breaches.

Usage

This architecture is written in SysML v2 Textual Notation. To compile and verify:

Install the Jupyter SysML v2 Kernel.

Load src/architecture.sysml.

Run the static analyzer to verify port bindings and type consistency.

Architected by Charles Austin II, Principal Solutions Architect.

State Transition Logic (PACE)

stateDiagram-v2
    [*] --> Check_Systems
    
    state Check_Systems {
        [*] --> Check_Battery
        Check_Battery --> Check_Sensor: Voltage > 18V
        Check_Battery --> Emergency_FTS: Voltage < 18V
    }

    state Operational_Modes {
        Check_Sensor --> Primary_Intercept: Conf > 90%
        Check_Sensor --> Alternate_Coast: Conf < 90%
        
        Primary_Intercept --> Alternate_Coast: Loss of Lock
        
        Alternate_Coast --> Primary_Intercept: Re-acquire (Conf > 95%)
        Alternate_Coast --> Contingency_Search: Timeout (> 2.0s)
        
        Contingency_Search --> Primary_Intercept: Miracle Lock (> 98%)
    }

    Operational_Modes --> Emergency_FTS: Geofence Breach
    Emergency_FTS --> [*]: Terminate

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