Motion compensating infrasound sensor

A method for detecting infrasound in a maritime environment, comprising the steps of:

• A) providing at least one waterborne platform;
• B) mounting a microbarometer having sufficient sensitivity to detect a pressure gradient of at least 12.5 Pascals per meter (12.5 Pa/m) to said waterborne platform;
• C) fixing an inertial measurement unit (IMU) to said waterborne platform;
• D) attaching a heave cancellation component (HCC) to said waterborne platform;
• and,
• E) cancelling a component of said infrasound with said HCC, using an input from said IMU and said microbarometer.

An infrasound sensor comprising:

• an unmanned surface vehicle (USV);
• a microbarometer mounted on said USV, said microbarometer having sufficient sensitivity to detect a pressure gradient of at least 12.5 Pascals per meter (12.5 Pa/m);
• an inertial measurement unit (IMU) mounted on said USV;
• a heave cancellation component (HCC) located on said USV, said heave cancellation filter receiving a pressure input from said microbarometer and a pressure input from said IMU that is based on heave of said microbarometer to generate an output pressure;
• and,
• said HCC further comprising a filter and an adaptive algorithm, said filter receiving said IMU pressure, environment noise pressure, and said HCC output being further supplied as an error signal to said filter through a closed feedback loop the includes an adaptive algorithm.