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1. (WO2019032594) SENSOR ARRAY IMAGING DEVICE
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What is claimed is:

1. A system for producing sensed images, comprising:

a sensor array including a plurality of sensor elements transmitting a signal waveform;

an image display device; and

a processor configured to:

receive echo sensor element data from the sensor array, and perform a temporal discrete Fourier transform (DFT) on the sensor element data;

when a size of a field of view to be displayed is larger than a size of the sensor array, perform zero padding to modify the sensor element data received from the sensor array to a size of the field of view for storage in a sensor data buffer;

when the size of a field of view to be displayed is not larger than a size of the sensor array, store the sensor element data to the sensor data buffer; perform a spatial DFT on the sensor data buffer to result in a sensor wavenumber data buffer;

determine a first reference point location of the sensor array;

determine a second reference point location of the field of view;

generate a reference Fresnel field based on the first and second reference point locations, the signal waveform transmitted from the sensor array, and the size of the field of view to obtain reference Fresnel field data; perform spatial DFT on the reference Fresnel field data to form forward Huygens-Fresnel transfer data;

perform complex number conjugation of the forward Huygens-Fresnel transfer data to form inverse Huygens-Fresnel transfer data for storage in an inverse Huygens-Fresnel transfer data buffer;

multiply each data element of the sensor wavenumber data buffer with each corresponding data element of the inverse Huygens-Fresnel transfer data buffer;

multiply each data element of the sensor wavenumber data buffer with a corresponding data element of a filter matched to the signal waveform transmitted from the sensor array for pulse compression if the signal waveforms transmitted from the sensor array is a pulse compression

waveform;

store the multiplied data elements into a rectilinear spectrum data buffer;

perform Stolt mapping on the rectilinear spectrum data buffer to form a nonuniformly sampled angular spectrum data for storage in an angular spectrum data buffer;

perform uniform resampling of nonuniformly sampled angular spectrum data;

perform spatial inverse DFT on uniformly resampled angular spectrum data to generate an image illustrating contents of the field of view;

and display the image on the image display device.

2. The system of claim 1, wherein the sensor elements have a predefined spatial arrangement.

3. The system of claim 1, wherein the image of the field of view is one, two or three dimensional.

4. The system of claim 1, wherein the image of the field of view has a predefined data sample spacing.

5. The system of claim 1, wherein the predefined data sample spacing of the image of the field of view is proportional to, including equal to, a predefined spacing between the sensor elements of the sensor array.

6. The system of claim 1, wherein a total number of pixels that span a cross-range extent of the field of view is less than, equal to, or is greater than a total number of the sensor elements in the sensor array.

7. The system of claim 1, wherein a total number of elements of the inverse Huygens-Fresnel transfer data buffer equals a total number of data samples that span a cross-range extent of the field of view.

8. The system of claim 1, wherein the processor generates one or more fields of views with distinct associated reference signal and reference Fresnel field data buffer.

9. The system of claim 1 , wherein the sensor array is a two-dimensional sensor array.

10. The system of claim 1 , wherein the sensor array includes at least one of a multidimensional array and a conformal surface array.

1 1. The system of claim 1, wherein the processor integrates data from multiple sensor positions, obtained by moving one or more sensors arrays, or obtained by a system of distinct sensor arrays, either stationary or moving.

12. A system for producing a reference Fresnel field signal, comprising:

a sensor array including a plurality of sensor elements, the sensor elements having a predefined spacing and a predefined waveform transmitted from the sensor array; and

a processor configured to:

determine a spatial reference point for the sensor array; determine a spatial reference point for a field of view to be imaged; generate reference Fresnel field sample data, based on the predefined waveform transmitted from the sensor array, to account for a space between the spatial reference points of the sensor array and the field of view; and

generate a data buffer containing reference Fresnel field sample data, wherein the reference Fresnel field sample data has reference Fresnel field data sample spacing which is proportional to, including equal to, the predefined spacing of the sensor elements, and wherein a total number of Fresnel field data samples of the reference Fresnel field sample data is identical to a total number of cross-range data samples of a field of view.

13. The system of claim 12, wherein the spatial reference point of the sensor array identifies a nominal center of the sensor array.

14. The system of claim 12, wherein the spatial reference point for the field of view identifies a nominal center of the field of view.

15. A system for producing an inverse Huygens-Fresnel transfer signal, comprising: a sensor array including a plurality of sensor elements, the sensor elements having a predefined spacing and a predefined waveform transmitted from the sensor array; and

a processor configured to:

determine a spatial discrete Fourier transform of reference Fresnel field data to produce forward Huygens-Fresnel transfer data for a forward Huygens- Fresnel transfer buffer, wherein the reference Fresnel field data has reference Fresnel field data sample spacing which is proportional to, including equal to, the predefined spacing of the sensor elements, and wherein a total number of Fresnel field data samples of the reference Fresnel field sample data is identical to a total number of cross-range data samples of a field of view; and determine a complex conjugation of the forward Huygens-Fresnel transfer data to produce data for an inverse Huygens-Fresnel transfer buffer.