Acoustic detection of small unmanned aircraft systems

A system for detecting and classifying vehicle, the system comprising:

• an acoustic sensor comprising a communication device and a power source;
• at least one processor;
• and
• one or more non-transitory computer-readable media storing computer-executable instructions that, when executed by the at least one processor, perform a method of detecting and classifying the vehicle, the method comprising:
• detecting at least one acoustic signal by the acoustic sensor;
• comparing the at least one acoustic signal to known non-threat signals;
• filtering out detected known non-threat signals from the at least one acoustic signal;
• classifying at least one origin of the at least one acoustic signal as an air, a ground, or a water vehicle by comparing the filtered signal to known threat signals;
• and
• causing activation of at least one second sensor to detect the air, the ground, or the water vehicle.

One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by at least one processor, perform a method of detecting and classifying a vehicle, the method comprising:

• detecting at least one acoustic signal by a self-contained acoustic sensor,
• wherein the self-contained acoustic sensor comprises a battery with a lifespan of at least one month;
• comparing the at least one acoustic signal to known non-threat signals;
• filtering out detected known non-threat signals from the at least one acoustic signal;
• classifying at least one origin of the at least one acoustic signal as an air, a ground, or a water vehicle by comparing the filtered signal to stored threat signals;
• and
• causing activation of at least one second sensor to detect the air, the ground, or the water vehicle.