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Comparison Study of Signal Processing Algorithms for 3D SAR Imaging of MM-WAVE GBSAR System
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Benyamin Hosseiny   , Jalal Amini * , Safieddin Safavi-Naeini |
| Department of Surveying and Geospatial Engineering, College of Engineering, University of Tehran |
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Abstract: (1957 Views) |
| This paper evaluates and compares the three-dimensional imaging algorithms for an mm-wave ground based synthetic aperture radar system. There has been significant attention to the development of new ground-based synthetic aperture radar (GBSAR) systems by increasing the demands for various radar remote sensing applications and data. GBSAR systems have unique capabilities, including optimum visual angle to the area of interest, high imaging rate, and low manufacturing and maintenance costs. However, the drawbacks of GBSAR systems can be their limited length of synthetic aperture and high variation between the near and far range comparing to the airborne and satéllite systems. These can affect the received signals and, consequently, the final radar image. To this end, in this paper, three signal processing algorithms, including the Backprojection (BP), Fourier Transform (FT), and Range Migration (RMA), are evaluated for three-dimensional SAR imaging of a GBSAR. This system operates in W frequency band and consists of a two-dimensional mechanical rail to generate a planar synthetic aperture. The above algorithm were investigated in a simulation environment using two different experiments, and the results were evaluated with four metrics, including angular resolution, peak sidelobe ratio (PSLR), integrated sidelobe ratio (ISLR), and signal-to-clutter ratio (SCR). According to the obtained results, all three algorithms presented acceptable imaging results. However, RMA demonstrated a high sensitivity of the target reflectivity to its distance from the zero Doppler line. Furthermore, RMA had more stability in decreasing the angular resolution by increasing the target’s range than the BP and FT algorithms. In contrast, BP and FT obtained poor results in near-field areas. In the case of signal compression, generally, RMA got poor results compared to the other two algorithms, which led to inappropriate results in far distances. Because of having a similar attitude, BP and FT, mostly obtained similar results. However, FT obtained more appealing results with better angular resolution, while the BP algorithm demonstrated slightly better signal compression. |
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| Keywords: Range migration algorithm, Backprojection, Fourier transform, Frequency domain, Time domain |
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Full-Text [PDF 1454 kb]
(616 Downloads)
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Type of Study: Research |
Subject:
RS
Received: 2021/10/4 | Accepted: 2022/04/27 | ePublished ahead of print: 2022/04/27 | Published: 2022/06/8
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