A study on sparse array configurations for ultra-wideband imaging applications

Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: BEYZAT TALAT ÇETİN

Danışman: LALE ALATAN

Özet:

The increased number of terror attacks and crimes have grown a demand for enhancing public security systems. In this sense reliable, cost eﬀective, fast and physically non-hazardous imaging systems should be designed. Multiple-input-multiple-output (MIMO)arrayswithultra-wideband(UWB)technologyoﬀersgreatadvantageousfor shortrangeimagingapplicationssuchasconcealedweapondetection(CWD).Inthis thesis, it is aimed to develop a design tool for MIMO array structures to be used in UWB, near-ﬁeld (NF) imaging applications. The analyses starts with examination of one-way arrays for better understanding of the nature of UWB arrays. Then, continues with the derivation of point spread function (PSF) for UWB MIMO arrays as a decisive performance parameter. Simulation results of diﬀerent MIMO array structures that are shared in the literature are examined with derived PSF expression in order to prove the validity of this method. Eﬀects of large operational bandwidth, range to the target and location of the target on observation plane on performance of the array are discussed. Finally, a MIMO array structure to be used in airports for concealed weapon detection is proposed.