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Environmental Noise Monitoring
BAMAS Remote Noise MonitorBAMAS Noise Monitoring System

The Noise Bearing and Amplitude Measurement and Analysis System (BAMAS) is a network of advanced noise monitors designed to detect, localize, and classify sound for military, industrial, and aircraft applications. Developed specifically for remote and unattended operation in harsh outdoor environments, BAMAS noise monitors provide significant capabilities beyond commercial systems which are based solely on conventional sound level meter (SLM) recorders. APS’s noise monitoring systems are being actively used at DoD installations to monitor blast noise emissions created by military testing and training activities.

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Our noise monitors feature several unique technologies:

Blast Noise Localization
BAMAS noise monitors measure sound direction-of-arrival (DOA) using a tetrahedral microphone array. The DOA, defined as the direction (in degrees relative to True North) that sound waves propagate from, is particularly useful to determine where the sound originated from. For military applications, DOA is used to determine the location of shot and impact.

Wind Trigger Rejection
Continuous and unattended monitoring for noise in remote areas presents a unique set of challenges that most noise monitors are not adequately designed for. Typical outdoor noise monitors leverage conventional SLMs which are not specifically designed or suitable for continuous outdoor use. One of the major problems with SLM based noise monitors is their susceptibility to falsely recording wind noise, commonly referred to as wind triggers. Wind triggers can overwhelm the user with thousands of false records which renders meaningful assessment of noise levels challenging if not impossible. BAMAS noise monitors leverage special computer algorithms which analyze each noise recording to determine if it is blast, aircraft, vehicle or wind noise – wind noise will be filtered out. BAMAS noise monitors have been demonstrated to have a very high wind trigger rejection rate.

BAMAS Web ToolBAMAS Web Tool
The BAMAS system user interface is a website hosted by the base station computer. The website may be used to display the time, location, bearing, and sound level of blast noise recordings using an interactive satellite map and sortable table. All recordings can be displayed, replayed, and downloaded. All data presented on the website may be exported to Google Earth as a *.kml file and Excel as a *.csv file. Additionally, users may query the health status of each noise monitor including the result of self-tests and the measurement of system voltages.

Monitor Highlights
• Remote, wireless, and unattended operation
• Noise detection and classification software
• Wind noise rejection software
• Automated email notifications
• Secure VPN networking
• Web tool with GIS mapping, noise levels, noise playback, and data download
• Data exports to Excel and Google Earth
• Software supports mobile devices, tablets, and PCs
• Solar and AC powered versions available

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