Advancements in Launch Vehicle Acoustic Monitoring: A One-third Octave Processing Algorithm

Real-time monitoring of launch vehicle acoustics ensures structural integrity and payload safety during flight. One-third octave analysis, as per ANSI S1.11 class 2 standard, is implemented in an acoustic processing unit. However, the resource-intensive nature of this analysis poses challenges for high-speed and energy-efficient systems. To address this, an algorithm is proposed which leverages the advantages of octave property and employs sequential band pass filtering with decimation, reducing computational complexity and minimizing processing time. To achieve higher dynamic range, oversampling followed by digital filtering was implemented. Efficiency is quantified, focusing on acoustic pressure excitations up to 4 kHz.