Measurement of Infrasound from the Marine Environment
Abstract
The objective of the Measurement of Infrasound from the Maritime Environment project team at Space and Naval Warfare Systems Center Pacific (SSC Pacific) is to develop an infrasound sensing capability that can operate from the maritime environment. Infrasound monitoring stations are normally situated on land-based sites. Because two thirds of the earths surface is composed of oceans, a functional maritime-based infrasound sensing capability would greatly enhance the ability to monitor natural and anthropogenic sources of infrasound around the world. Ocean heave, as measured by the sea surface spectrum, is shown to occupy a significant portion of the infrasound receive frequency band. Measurements were taken with a microbarometer fielded on board a ship during an at-sea experiment. The collected sound pressure data shows the interference effects of ocean heave, which are due to the change in the background atmospheric pressure as the sensor moves up and down. An external inertial measurement unit (IMU) was used to estimate the heave, and was highly correlated with the pressure interference signal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2015
- Accession Number
- AD1006592
Entities
People
- Chad Williams
- Douglas Grimmett
- Randall Plate
- Talmadge Carrick
Organizations
- Naval Information Warfare Systems Command