RCS measurement and SAR imaging verification based on blast furnace stock line
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摘要: 圍繞高爐雷達料面監測系統成像需求，針對高爐雷達測量目標的雷達橫截面積（radar cross section，RCS）展開應用研究，首次實現了微波暗室中高爐料線RCS的高精度自動化測量，為高爐雷達目標特性的深入研究奠定了硬件基礎.基于比較法測得10 GHz處的焦炭、燒結礦顆粒的RCS典型值分布以及高爐料線散射方向性圖，測量動態范圍為-10~15 dB.通過RCS測量和成像診斷等方法對工業現場布焦、布礦的雷達回波信號強度差別大等問題進行了探索和分析.模擬工業現場的焦炭、燒結礦等平臺加漏斗的料線形狀，對散裝物料進行了等比例縮小的實際擺放，對典型料線縮比模型進行了合成孔徑雷達（synthetic aperture radar，SAR）成像驗證，并深入分析了成像缺失和成像誤差原因，得知漏斗部分在低頻情況下成像效果不理想，需要提高測試頻段；利用標準球模擬料線分析成像誤差，方位向和距離向絕對誤差在1.2%和5.8%以內，暗室內方位向測量誤差不超過±0.01 m.Abstract: Based on the requirements of blast furnace burden surface monitoring imaging, this study investigated the measurement of the radar cross section (RCS) of the blast furnace radar target. For the first time, a highly precise automatic measurement of the RCS of a blast furnace stock line in a microwave anechoic chamber was realized. Based on this, the characteristics of the blast furnace radar target were studied. The RCS typical distribution of coke and sinter particles and the scattering directivity pattern of the blast furnace stock line at 10 GHz were measured based on a comparative method, and the measured dynamic range was -10-15 dB. Problems such as the intensity difference of radar echo signals between the coke and sinter distribution in the industrial field were explored and analyzed by the RCS measurement and imaging diagnosis. The stock line shape of coke and sinter on the industrial site, known as platform plus funnel type, was simulated, and bulk materials were placed and scaled down. Synthetic aperture radar (SAR) imaging verification was performed on the shrinkage ratio model of the typical stock line, and the reasons for imaging loss and error were deeply analyzed. At a low frequency, the imaging of the funnel section is not satisfactory; hence the test frequency band should be improved. A blast furnace stock line made of standard balls was used to analyze the imaging errors. The absolute errors in the azimuth and range directions are 1.2% and 5.8%, respectively, and the azimuth measurement error in the anechoic chamber does not exceed ±0.01 m.
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Key words:
- blast furnace /
- radar /
- stock line /
- RCS measurement /
- SAR imaging
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參考文獻
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