| Title | High-Resolution Real-Time Underwater 3-D Acoustical Imaging Through Designing Ultralarge Ultrasparse Ultra-Wideband 2-D Arrays |
| Authors | Chi, Cheng Li, Zhaohui |
| Affiliation | Peking Univ, Dept Elect, Beijing 100871, Peoples R China. |
| Keywords | 3-D acoustical imaging array design high resolution ultralarge ultrasparse ultra-wideband (UUU) 2-D arrays MODULATED EXCITATION SIGNALS LARGE PLANAR ARRAYS MEDICAL ULTRASOUND NEAR-FIELD SONAR SYSTEM VISION LOBE |
| Issue Date | 2017 |
| Publisher | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT |
| Citation | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT.2017,66(10),2647-2657. |
| Abstract | Acoustical imaging systems are an important kind of instrumentation for underwater investigation. Currently, angular resolutions of most existing real-time underwater 3-D imaging systems are around 1 degrees, which cannot meet the high-quality imaging requirement in a relatively far distance. Enhancing the angular resolution of a real-time 3-D imaging system needs enlarging the aperture size of its receiving 2-D array. However, the huge number of elements is not affordable for a traditional fully sampled uniform large 2-D array with half-wavelength interelement spacing to achieve a high angular resolution. This paper proposes the concept of ultralarge ultrasparse ultrawideband (UUU) 2-D arrays for achieving the high angular resolution of underwater 3-D acoustical imaging systems. The design method of UUU 2-D arrays is demonstrated through the example of designing an annular 2-D array with only 100 elements. The capabilities of the designed annular UUU 2-D array are evaluated, showing that it can achieve a 0.1 degrees angular resolution and a -32 dB maximum sidelobe level. The imaging simulations of complicated targets also demonstrate that the designed annular UUU 2-D array can satisfy the requirement of high-resolution underwater 3-D acoustical imaging. The element number of the designed annular UUU 2-D array is 4 orders of magnitude lower than that of a fully sampled uniform 2-D array, which provides a viable choice for developing high-resolution real-time underwater 3-D acoustical imaging systems. |
| URI | http://hdl.handle.net/20.500.11897/470642 |
| ISSN | 0018-9456 |
| DOI | 10.1109/TIM.2017.2709519 |
| Indexed | SCI(E) |
| Appears in Collections: | 信息科学技术学院 |
