Sıkıştırılmış Algılama ile Milimetredalga Görüntüleme: Modulasyon Frekansı ve Veri Tipi Etkileri

Mete, Mustafa
Altan, Hakan
Millimeter wave imaging is a promising field that can be used in many areas, primarily in defense and security. The lack of high-resolution two-dimensional imaging detectors that work in this band, as well as the cost of measurements in this frequency band being high, make single-pixel imaging configuration attractive. Data acquisition with compressed sensing is preferred to reduce the number of measurements. In this study, an experimental study of millimeter-wave imaging at 60 GHz center frequency is presented. The masks used in compressed sensing are designed to have a new mask in each row/column motion to approach real time imaging. The effect of the acquired data type and modulation frequency on the reconstructed image is investigated.


Optimal design of sparse mimo arrays for wideband near-field imaging based on a statistical framework
Kocamış, Mehmet Burak; Öktem, Sevinç Figen; Department of Electrical and Electronics Engineering (2018)
Wideband near-field imaging is an emerging remote sensing technique in various applications such as airport security, surveillance, medical diagnosis, and through-wall imaging. Recently, there has been increasing interest in using sparse multiple-input-multiple-output (MIMO) arrays to achieve high resolution with reduced hardware complexity and cost. In this thesis, based on a statistical framework, an optimal design method is presented for two-dimensional MIMO arrays in wideband near-field imaging. Differe...
Deep learning-based reconstruction methods for near-field MIMO radar imaging
Manisalı, İrfan; Öktem, Sevinç Figen; Department of Electrical and Electronics Engineering (2022-6-29)
Near-field multiple-input multiple-output (MIMO) radar imaging systems are of interest in diverse fields such as medicine, through-wall imaging, airport security, and surveillance. These computational imaging systems reconstruct the three-dimensional scene reflectivity distribution from the radar data. Hence their imaging performance largely depends on the image reconstruction method. The analytical reconstruction methods suffer from either low image quality or high computational cost. In fact, sparsity-bas...
Terahertz (>0.3THz) active imaging systems
İdikut, Fırat; Altan, Hakan; Department of Physics (2016)
Imaging systems based on terahertz waves are becoming an integral part of commercial and military screening applications. In this thesis, the prototype of active scan THz imaging system was constructed for detection of concealed objects at standoff distance longer than 5m. The system was mounted on a platform that can adjust in height, tilt and azimuthal angle. The methods of generation and detection of THz signal are based on Schottky diode rectifiers and Schottky diode mixers. The wavelength of the contin...
Novel methods in modulation and detection of terahertz waves for imaging applications
Takan, Taylan; Altan, Hakan; Department of Physics (2018)
Terahertz radiation, due to its unique properties offers a plethora of possibilities of applications in various domains including security & defense, communications, material characterization, product inspection and medical imaging. In all these fields, cost-effective, high-resolution, and high-speed terahertz imaging is a greatly desired technology. However due the inherent challenges associated with terahertz detection, building a terahertz imaging system that satisfies all these requirements necessitates...
Çok Genişbantlı Mikrodalga Görüntüleme için Optimal MIMO Dizilimi
Kocamis, Burak; Öktem, Sevinç Figen (2017-05-18)
Wideband microwave imaging systems are recently used in various applications including airport security, surveillance, through-wall imaging and medicine. For the operation of such high-resolution systems, sparse multiple-input-multiple output (MIMO) arrays are of interest to reduce the hardware complexity and cost of conventional planar arrays. In this paper, we present a method for the optimal design of two-dimensional MIMO arrays in near-field imaging. Using a statistical framework, the optimality criteri...
Citation Formats
E. ŞENGÜN ERMEYDAN, M. Mete, A. B. ŞAHİN, H. Altan, and İ. ÇANKAYA, “Sıkıştırılmış Algılama ile Milimetredalga Görüntüleme: Modulasyon Frekansı ve Veri Tipi Etkileri,” 2018, Accessed: 00, 2020. [Online]. Available: