A method is proposed for near-field narrowband source localization based on measurements from a uniform linear array
(ULA) of sensors. This incoming field can be measured as a function of delay between each outer sensor and the center
reference sensor. The approach uses a Fresnel approximation for the time delay between the sensor data as a function of
direction of arrival and range. A minimum variance distortionless response (MVDR) filter is constructed to focus on any
given near field location and the output is calculated when the recorded signal is passed through it. The intensity of this
output for the various MVDR filters gives information on the source location and intensity.