Advanced Laser Vibrometry in Pulsed Mode using Poly-Pulse Waveforms and Time-frequency Processing

Julien Totems (1) , Véronique Jolivet (1) , Jean-Philippe Ovarlez (2, 3) , Nadine Martin (4)

1 ONERA - The French Aerospace Lab [Châtillon]
2 SONDRA - Sondra, CentraleSupélec, Université Paris-Saclay (COmUE)
3 ONERA - The French Aerospace Lab [Toulouse]
4 GIPSA-SAIGA - GIPSA - Signal et Automatique pour la surveillance, le diagnostic et la biomécanique

Vibration sensing by laser radar with a pulsed emission is a promising technique for long range target recognition and identification. However, compared to its continuous-wave counterpart, it is impaired by its greater sensitivity to speckle noise and its lack of robustness to multiple independent vibrations of the target surface. Using poly-pulse waveforms for greater velocity resolution, we developed a new estimator to take into account signal statistics, and time frequency representations that can achieve better performance than classical processing methods. Simulations show a 5dB improvement in Signal-to- Noise Ratio (SNR) when speckle noise is dominant, and 4dB improvement when signal is weak in regard to detection noise.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Julien Totems, Véronique Jolivet, Jean-Philippe Ovarlez, Nadine Martin. Advanced Laser Vibrometry in Pulsed Mode using Poly-Pulse Waveforms and Time-frequency Processing. OPTRO 2010 - 4th International Symposium on Optronics in Defence and Security, Feb 2010, Paris, France. ⟨hal-00556221v2⟩