title: Aerial ultrasonic micro Doppler sonar detection range in outdoor environments.
abstract: Current research demonstrates that micro Doppler sonar has the capability to uniquely identify the presence of a moving human, making it an attractive component in surveillance systems for border security applications. Primary environmental factors that limit sonar performance are two-way spreading losses, ultrasonic absorption, and backscattered energy from the ground that appears at zero Doppler shift in the sonar signal processor. Spectral leakage from the backscatter component has a significant effect on sonar performance for slow moving targets. Sonar performance is shown to rapidly decay as the sensor is moved closer to the ground due to increasing surface backscatter levels.
authors.affiliation: National Center for Physical Acoustics, The University of Mississippi, 1 Coliseum Drive, University, Mississippi 38677, USA. rrbradle@olemiss.edu
authors.forename: Marshall
authors.initials: M
authors.lastname: Bradley
authors.forename: James M
authors.initials: JM
authors.lastname: Sabatier
mesh_terms: D004301:Doppler Effect; D004777:Environment; D005583:Fourier Analysis; D006801:Humans; D009068:Movement / Q000502:physiology*; D012542:Scattering, Radiation; D013018:Sound Spectrography; D014465:Ultrasonics