Satellite Jitter Analysis
LaFontaine Engineering provides end-to-end on-orbit jitter prediction and mitigation support for spacecraft and precision payloads, enabling accurate assessment of line-of-sight stability and mission performance. Our approach integrates disturbance characterization, high-fidelity structural dynamics, and time- and frequency-domain analyses to produce defensible jitter predictions across relevant operational scenarios.
We process and characterize reaction wheel and on-orbit disturbance data, including imbalance forces, tonal content, broadband disturbances, and operational speed profiles. These inputs are translated into physically consistent forcing functions suitable for structural dynamic analysis and control-structure interaction studies.
Our team performs correlation of finite element structural dynamics models using test and flight data, ensuring accurate representation of modal frequencies, mode shapes, damping, and coupling paths between disturbance sources and sensitive payloads. Reduced-order and modal-domain models are developed to support efficient jitter analysis without loss of critical dynamic behavior.
We execute both frequency-domain (PSD and FRF-based) and time-domain simulations to evaluate jitter response under steady-state and transient conditions, capturing tonal amplification, broadband response, and operational transients such as wheel speed changes or mode crossings. Results are transformed into physically meaningful performance metrics through line-of-sight (LOS) equations that map structural motion and rotation into optical or sensor pointing error.
Exposure effects are explicitly considered through exposure window sizing, accounting for integration time, sampling effects, and temporal averaging relevant to payload operation. This ensures predicted jitter levels are directly comparable to system-level performance requirements.
Based on these assessments, LaFontaine Engineering supports the design and evaluation of jitter mitigation strategies, including reaction wheel isolation, structural stiffness and damping modifications, mass distribution adjustments, operational constraints, and control-law tuning. The result is a validated, end-to-end jitter prediction capability that supports design trades, requirement verification, and on-orbit performance assurance.