Millimetre-wave imaging with reduced number of degrees of freedom in array signal processing: concepts for enhanced angular resolution

[摘要] This paper deals with millimetre-wave imagingsystems based on linear receiving arrays and is focused onthe issue of angular resolution and coverage for arrays wherethe number M of ports is smaller than the number N of elementsdue to forming of subarrays. For a wide angularcoverage a trade-off between a narrow beam width and ahigh side-lobe suppression is shown to occur which requiresproper synthesis of the subarray pattern. Two concepts foran enhanced angular resolution are presented. The first usesa combination of a frequency dependent distribution network(frequency scanning) with array signal processing to enhanceangular resolution by cost of a reduced range resolution. Thesecond approach takes advantage of relative movements toenhance angular resolution via a combined angular and temporal(Doppler) processing.

[学科分类] 电子、光学、磁材料