Noise
& Operations Monitoring System (NOMS)
Our
NOMS consists of two basic elements: a connection to the FAA’s radar
system for the purpose of acquiring flight track information, and 16 permanent
noise-monitoring stations. The NOMS main server, located in the DOA’s
offices at Hartsfield-Jackson Atlanta International Airport (HJAIA) collects
data from both the FAA’s radar tracking system and the noise monitors.
The integration of these two systems allows the DOA to gather information
on the flight of aircraft and the resultant noise levels in communities
surrounding Hartsfield-Jackson.
We use the radar data we acquire from the FAA to communicate a property’s location relative to typical arrival and departure corridors; to confirm that airplanes are adhering to our Noise Abatement Departure Tracks; and to perform operational analyses. An operational analysis can provide information about the numbers, types, and altitudes of airplanes that fly over a specific property during a given time period. It is important to note that there are rules that govern the usage of the radar data that we acquire; those rules are stipulated in our Memorandum of Agreement with the FAA.
How do we use the noise monitors? Unattended noise monitoring is imprecise. The monitors are not as sophisticated as our brains and our ears are. Human beings are sensitive to tonal variations; our noise monitors are not. Human beings can look up and verify that what sounds like an airplane really is one; our monitors cannot yet do that. The noise monitoring sites attempt to differentiate between aircraft and other noise sources by referencing programmed algorithm thresholds as noise events progress. Later on, NOMS software compares tentatively identified aircraft noise events to radar data to see if aircraft were nearby when the event in question occurred. Therefore, the best current potential use of the noise-monitoring portion of the system is to confirm Integrated Noise Model (INM) input should what is monitored and what is generated by INM differ significantly. The monitors also let us look at the average noise levels of different types of aircraft. Which airplanes contribute the most to the overall aircraft noise impact? The noise monitors can provide the answer.
We use the radar data we acquire from the FAA to communicate a property’s location relative to typical arrival and departure corridors; to confirm that airplanes are adhering to our Noise Abatement Departure Tracks; and to perform operational analyses. An operational analysis can provide information about the numbers, types, and altitudes of airplanes that fly over a specific property during a given time period. It is important to note that there are rules that govern the usage of the radar data that we acquire; those rules are stipulated in our Memorandum of Agreement with the FAA.
How do we use the noise monitors? Unattended noise monitoring is imprecise. The monitors are not as sophisticated as our brains and our ears are. Human beings are sensitive to tonal variations; our noise monitors are not. Human beings can look up and verify that what sounds like an airplane really is one; our monitors cannot yet do that. The noise monitoring sites attempt to differentiate between aircraft and other noise sources by referencing programmed algorithm thresholds as noise events progress. Later on, NOMS software compares tentatively identified aircraft noise events to radar data to see if aircraft were nearby when the event in question occurred. Therefore, the best current potential use of the noise-monitoring portion of the system is to confirm Integrated Noise Model (INM) input should what is monitored and what is generated by INM differ significantly. The monitors also let us look at the average noise levels of different types of aircraft. Which airplanes contribute the most to the overall aircraft noise impact? The noise monitors can provide the answer.
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