Near Field Active Imaging Using Sparse Arrays

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Sensor arrays designed for far field operation may experience performance degradation when imaging near field objects. Specifically, sparse active arrays utilizing the additional degrees of freedom provided by the sum co-array are susceptible to these effects, as the co-array depends on both the range and direction of scatterers close to the array. Consequently, a uniform far field sum co-array may become non-uniform in the near field. As a result, co-array processing algorithms, such as image addition, are subject to undesired grating lobes in the presence of near field scatterers. This paper proposes an extension to image addition for mitigating such undesired distortions. The method compensates for near field effects by computing spatially varying transmit and receive element weights. These weights minimize the discrepancy between the desired and achieved near field point spread function, while using as few image addition components as possible. Given a desired point spread function and a set of calibration measurements of the near field array steering vectors, a regularized convex optimization problem is then solved for each pixel of the image.

Original languageEnglish
Title of host publicationConference Record of the 52nd Asilomar Conference on Signals, Systems and Computers, ACSSC 2018
EditorsMichael B. Matthews
Number of pages6
ISBN (Electronic)9781538692189
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventAsilomar Conference on Signals, Systems & Computers - Pacific Grove, United States
Duration: 28 Oct 201831 Oct 2018
Conference number: 52


ConferenceAsilomar Conference on Signals, Systems & Computers
Abbreviated titleACSSC
Country/TerritoryUnited States
CityPacific Grove


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