Approximation of distances for radar imaging

A non-transitory computer-readable medium comprising computer executable instructions that when executed by a computer will cause the computer to:

• for each antenna element of an antenna array, the antenna array comprising a plurality of antenna elements grouped into at least one array cluster:
• match-filter radar reflection data received at the antenna element, the radar reflection data being representative of a scene comprising a plurality of scene resolution cells, the match-filtering against a signal model to produce image data, wherein the signal model is calculated using approximated distances between the antenna element and each scene resolution cell, wherein the approximated distance between the antenna element and each scene resolution cell is determined using a distance measured from the centre of the array cluster containing the antenna element.

A system configured to process radar reflection data received at an antenna array, the antenna array comprising a plurality of antenna elements grouped into at least one array cluster, the radar reflection data being representative of a scene, the scene comprising a plurality of scene resolution cells, the method comprising, for each antenna element:

• match-filtering the radar reflection data received at the antenna element against a signal model to produce image data, wherein the signal model is calculated using approximated distances between the antenna element and each scene resolution cell, wherein the approximated distance between the antenna element and each scene resolution cell is determined using a distance measured from the centre of the array cluster containing the antenna element.