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| Citation: | WANG Yanfei, LI Heping, and HAN Song. Synthetic aperture imaging of antenna array coded[J]. Journal of Radars, 2023, 12(1): 1–12. doi: 10.12000/JR23011
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Abstract
The theoretical azimuth resolution of Synthetic Aperture Radar (SAR) is half the antenna length, presenting conflicting requirements on the antenna for SAR high-resolution and long-distance imaging. In this paper, a method for antenna array coding synthetic aperture imaging is proposed. By dividing long antennas into subarrays to work together, the space energy utilization rate can be improved, a high resolution of the small antennas of the subarrays and a high gain of the long antennas of the whole array are achieved, and the problem that it is difficult to balance high-resolution and far-distance imaging is solved. On the basis of introducing the basic concept of array coding, the imaging model and processing flow of array coding radar are given, and the system performance metrics, such as resolution, signal-to-noise ratio, Pulse Repetition Frequency (PRF), and range-azimuth ambiguity, are theoretically analyzed and discussed. In a flight test experiment, a 0.5 m antenna is divided into four sub-arrays, and a strip-map image with a resolution of 0.1 m and a swath width of 8 km is obtained, which breaks the restriction of small-area imaging when traditional SAR adopts the spotlight mode to achieve high resolution. This new method effectively solves the limitations of traditional SAR and extends the signal dimension, providing a technical basis for enhancing radar system capability. Theoretical analysis and experimental results verify the considerable advantages and engineering implementation feasibility of the proposed method. -
References
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JIN Yaqiu. Multimode remote sensing intelligent information and target recognition: Physical intelligence of microwave vision[J]. Journal of Radars, 2019, 8(6): 710–716. doi: 10.12000/JR19083
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- Figure 1. Geometric diagram of synthetic aperture radar imaging mode
- Figure 2. Geometric diagram of synthetic aperture radar
- Figure 3. Geometric diagram of multiple sub-array coding
- Figure 4. Geometric diagram between different sub-array
- Figure 5. Schematic diagram of antenna array coded and coherent processing synthesis
- Figure 6. Geometric diagram of antenna array imaging
- Figure 7. Schematic diagram of antenna array
- Figure 8. Flow chart of antenna array coded radar imaging process
- Figure 9. Schematic diagram of antenna array coded radar system
- Figure 10. 0.1 m strip map image by the antenna array coded radar system
- Figure 11. Resolution of point target form the image (Azimuth: 0.086 m; range: 0.127 m)
- Figure 12. Continuous instantaneous imaging of antenna array coded radar system
- Figure 13. Continuous instantaneous zoomed image of antenna array coded radar system
- Figure 14. SAR image of the same area of Fig. 12