Closed-Loop Latency and Phase Lag in HIL Flight Simulation: Preventing Pilot-Induced Oscillations (PIO)

A mathematical analysis of latency budgets in real-time simulation, ensuring synthetic testbeds mirror true aircraft handling.

The Destructive Impact of Simulation Latency

If an HIL simulation rig introduces more than 5 milliseconds of transport delay between sensor generation and physics feedback, the flight control loop experiences artificial phase lag, inducing Pilot-Induced Oscillations (PIO) that do not exist in the real aircraft.

FPGA-Accelerated Signal Generation

By implementing sensor signal synthesis (synchro, LVDT, ARINC 429) inside dedicated FPGA logic blocks, Avionicsimulator reduces loop transport delay to under 250 microseconds, providing flawless flight handling fidelity.

Validating Flight Test Correlation

Following maiden flights, telemetry recorded in the air is replayed into the HIL rig: simulation parameters are calibrated until virtual responses match actual flight test data with over 99% correlation.

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