Partitioning for radar systems
Data is received characterizing a plurality of measurements for a scene received by a plurality of sensor elements forming a sensor array. A plurality of scene sub-domains is mapped to the plurality of sensor elements. A plurality of voxels associated with one of the plurality of scene sub-domains is mapped to a plurality of measurement sub-domains. One or more scattering coefficients of the scene is determined by applying the mapping to the received data. Related apparatus, systems, techniques, and articles are also described.
1. A method comprising:
receiving data characterizing radar return measurements associated with a volume, the data received by sensor elements forming a sensor array;
determining backscatter coefficients by at least multiplying the data with two mappings, wherein the two mappings include a first mapping associating a first grouping of voxels included in the volume with an individual sensor element, and a second mapping associating an individual voxel included in the volume with a second grouping of sensor elements in the sensor array; and
providing the determined backscatter coefficients.
2. The method of claim 1 , wherein the first mapping includes a first block diagonal transfer matrix characterizing a distance between the individual sensor element and a volume center of the first grouping of voxels.
3. The method of claim 1 , wherein the second mapping includes a second block diagonal transfer matrix characterizing a distance between a center of the second grouping of sensor elements and the individual voxel.
4. The method of claim 1 , wherein the second grouping of sensor elements includes a grouping of proximal transmitting sensor elements, proximal receiving sensor elements, and frequencies within a predefined frequency range.
5. The method of claim 4 , wherein the sensor array comprises a plurality of antenna panels, the transmitting sensor elements are proximal when the transmitting sensor elements reside on a first common antenna panel and the receiving sensor elements are proximal when the receiving sensor elements reside on a second common antenna panel.
6. The method of claim 1 , wherein the second mapping characterizes a local spherical phase correction of the radar return measurements.
7. The method of claim 1 , further comprising
partitioning a scene into volumes by associating voxels together to define the first grouping of voxels.
8. The method of claim 1 , wherein the first mapping and the second mapping are predetermined.
9. The method of claim 1 , wherein the providing includes processing the determined backscatter coefficients to create an image of an object.
10. The method of claim 1 , wherein the first mapping associates each of the sensor elements with the first grouping of voxels, and wherein the second mapping associates each of a plurality of voxels with the second grouping of sensor elements.
11. The method of claim 10 , wherein the first mapping associates each of the sensor elements with each of a plurality of third groupings of voxels, and wherein the second mapping associates each of the plurality of voxels with each of a plurality of fourth groupings of sensor elements.
12. The method of claim 1 , wherein the first mapping associates a second individual sensor element with a third grouping of voxels, and wherein the second mapping associates a second individual voxel with a fourth grouping of sensor elements.
13. An apparatus comprising:
at least one data processor;
memory storing instructions which, when executed by the at least one data processor, causes the at least one data processor to perform operations comprising:
receiving data characterizing radar return measurements associated with a volume, the data received by sensor elements forming a sensor array;
determining backscatter coefficients by at least multiplying the data with two mappings, wherein the two mappings include a first mapping associating a first grouping of voxels included in the volume with an individual sensor element, and a second mapping associating an individual voxel included in the volume with a second grouping of sensor elements in the sensor array; and
providing the determined backscatter coefficients.
14. The apparatus of claim 13 , wherein the first mapping includes a first block diagonal transfer matrix characterizing a distance between the individual sensor element and a volume center of the first grouping of voxels.
15. The apparatus of claim 13 , wherein the second mapping includes a second block diagonal transfer matrix characterizing a distance between a center of the second grouping of sensor elements and the individual voxel.
16. The apparatus of claim 13 , wherein the second grouping of sensor elements includes a grouping of proximal transmitting sensor elements, proximal receiving sensor elements, and frequencies within a predefined frequency range.
17. The apparatus of claim 16 , wherein the sensor array comprises a plurality of antenna panels, the transmitting sensor elements are proximal when the transmitting sensor elements reside on a first common antenna panel and the receiving sensor elements are proximal when the receiving sensor elements reside on a second common antenna panel.
18. The apparatus of claim 13 , wherein the second mapping characterizes a local spherical phase correction of the radar return measurements.
19. The apparatus of claim 13 , the operations further comprising
partitioning a scene into volumes by associating voxels together to define the first grouping of voxels.
20. The apparatus of claim 13 , wherein the first mapping and the second mapping are predetermined.
21. The apparatus of claim 13 , wherein the providing includes processing the determined backscatter coefficients to create an image of an object.
22. The apparatus of claim 13 , wherein the first mapping associates each of the sensor elements with the first grouping of voxels, and wherein the second mapping associates each of a plurality of voxels with the second grouping of sensor elements.
23. The apparatus of claim 22 , wherein the first mapping associates each of the sensor elements with each of a plurality of third groupings of voxels, and wherein the second mapping associates each of the plurality of voxels with each of a plurality of fourth groupings of sensor elements.
24. The apparatus of claim 13 , wherein the first mapping associates a second individual sensor element with a third grouping of voxels, and wherein the second mapping associates a second individual voxel with a fourth grouping of sensor elements.
25. An apparatus comprising:
means for receiving data characterizing radar return measurements associated with a volume, the data received by sensor elements forming a sensor array;
means for determining backscatter coefficients by at least multiplying the data with two mappings, wherein the two mappings include a first mapping associating a first grouping of voxels included in the volume with an individual sensor element, and a second mapping associating an individual voxel included in the volume with a second grouping of sensor elements in the sensor array; and
means for providing the determined backscatter coefficients.
26. A non-transitory computer program product storing instructions, which when executed by at least one data processor of at least one computing system, implement operations comprising:
receiving data characterizing radar return measurements associated with a volume, the data received by sensor elements forming a sensor array;
determining backscatter coefficients by at least multiplying the data with two mappings, wherein the two mappings include a first mapping associating a first grouping of voxels included in the volume with an individual sensor element, and a second mapping associating an individual voxel included in the volume with a second grouping of sensor elements in the sensor array; and
providing the determined backscatter coefficients.