Systems, methods, and apparatus for estimating angle of arrival

A method comprising:

• receiving one or more signals at a sensor apparatus, the sensor apparatus having a plurality of sensors, wherein each of the plurality of sensors is configured to receive one or more signals;
• generating, by one or more processors, a data matrix based on one or more signals received at each of the plurality of sensors;
• determining, by the one or more processors, a covariance matrix based on the data matrix;
• decomposing, by the one or more processors, the covariance matrix into a matrix of eigenvalues and a matrix of eigenvectors;
• determining, by the one or more processors, a projected data matrix based on applying the data matrix to one or more of the eigenvectors;
• determining, by the one or more processors, a denoised projected data matrix based on each column of the projected data matrix being a set of time data in a specific direction of a specific eigenvector;
• determining, by the one or more processors, a denoised matrix by projecting the denoised projected data matrix;
• determining, by the one or more processors, an angle of arrival of the one or more signals based on the denoised matrix;
• communicating, by the one or more processors, the angle of arrival to an avionics unit of an aircraft;
• and
• causing, by the one or more processors, a location to determine an emitting source relative to the aircraft.

A non-transitory computer-readable medium having stored thereon instruction code, wherein the instruction code is executable by one or more processors to perform operations comprising:

• receiving one or more signals;
• generating a data matrix based on the one or more signals;
• determining a covariance matrix based on the data matrix;
• decomposing the covariance matrix into a matrix of eigenvalues and a matrix of eigenvectors;
• determining a projected data matrix based on applying the data matrix to one or more of the eigenvectors;
• determining a denoised projected data matrix based on denoising the projected data matrix;
• determining a denoised matrix by projecting the denoised projected data matrix;
• determining, by the one or more processors, an angle of arrival of the one or more signals based on the denoised matrix;
• communicating, by the one or more processors, the angle of arrival to an avionics unit of an aircraft;
• and
• causing, by the one or more processors, a location to determine an emitting source relative to the aircraft.