研究目的
Investigating the effectiveness of annular array synthetic aperture radar (AASAR) for high-quality 3-D microwave imaging by combining the advantages of linear array SAR in side-lobe suppression and circular SAR in high resolution.
研究成果
The AASAR mode presented in this paper effectively combines the advantages of linear array SAR and circular SAR, achieving high-quality 3-D radar imaging with effective side-lobe suppression. The theoretical analysis and experimental results validate the AASAR's capability for 3-D imaging, demonstrating its potential for improving the quality of SAR images.
研究不足
The study focuses on the theoretical derivation and experimental validation of AASAR for 3-D imaging, but the practical implementation and scalability of the system in real-world scenarios are not extensively discussed. The experiment is limited to a specific target scene (4 metal balls), and the performance in more complex environments is not evaluated.
1：Experimental Design and Method Selection:
The study employs a new kind of annular array SAR (AASAR) mode for 3-D microwave imaging, combining the advantages of linear array SAR and circular SAR. Theoretical models and algorithms are used to derive the AASAR model and analyze its resolution.
2：Sample Selection and Data Sources:
A proto-type AASAR experiment system is built, and outdoor experiments are conducted with a target scene of 4 metal balls.
3：List of Experimental Equipment and Materials:
The experiment uses a stepped frequency (SF) signal as the transmitting signal, with antennas installed in a guide rail for linear motion and rotation to synthesize the annular array.
4：Experimental Procedures and Operational Workflow:
The SF signal is generated and transmitted, with the scattering signal received and processed to obtain the scattering information of the target scene. HRRP technique and 3-D BP imaging algorithm are used for 3-D target scene reconstruction.
5：Data Analysis Methods:
The performance of AASAR is compared with traditional CSAR in terms of resolution, PSLR, and ISLR to demonstrate its effectiveness in 3-D imaging and side-lobe suppression.
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