DBF相控陣天線在超高分辨率機載SAR中的應用
The Application of phased array antenna with DBF for the airborne SAR of ultrahigh azimuth resolution
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摘要: 該文從疊加原理和相控陣天線的掃描原理出發(fā),提出了一種靈活方便的波束生成方法。用此方法由微帶貼片天線單元組成了145cm48cm的天線陣,生成了波長為24cm,方位向半功率波束寬度為23的寬波束。由合成孔徑原理可知,條帶SAR的方位分辨率隨波束寬度的變寬而提高。該文將寬波束天線用于超高方位分辨率機載SAR,計算了天線的性能指標和SAR的系統(tǒng)參數(shù)。比較了條帶SAR和Spotlight SAR這兩種常見的SAR模式的分辨率和測繪范圍。Abstract: This paper proposes a new flexible method of the beam shaping based on superposition principle and the scanning principle of phased array antenna. We designed a 145cm*48cm array composed of microstrip patch elements with the wavelength of 24cm. In the azimuth direction, the pattern of this array has 23 half-power beam width. According to the principle of the synthetic aperture, the azimuth spatial resolution of the strip SAR is improved dramatically with wide exam. In this paper, the wide beam antenna array is used as the antenna of an airborne SAR with ultrahigh azimuth resolution. The parameters of the antenna and the SAR system are calculated and are compared between the strip-mapping SAR and the Spotlight SAR.
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