飛機(jī)發(fā)動(dòng)機(jī)旋轉(zhuǎn)葉片的散射譜特征
Scattering Spectrum Signature of Rotating Blades for Aircraft Engine
-
摘要: 飛機(jī)發(fā)動(dòng)機(jī)旋轉(zhuǎn)葉片引起的周期性運(yùn)動(dòng)部件調(diào)制(PMPM)影響目標(biāo)多普勒頻率跟蹤精度，同時(shí)也為目標(biāo)識(shí)別提供了重要特征信息。該文基于旋轉(zhuǎn)葉片組電磁散射計(jì)算模型和實(shí)驗(yàn)測(cè)量數(shù)據(jù)，重點(diǎn)分析了PMPM頻譜包絡(luò)調(diào)制現(xiàn)象的形成原因。結(jié)果表明：與葉片傾斜角一樣，扭角也是影響PMPM頻譜分布的重要因素。
-
關(guān)鍵詞:
- 目標(biāo)識(shí)別; 葉片; 扭角; 調(diào)制
Abstract: The moving parts of an aircraft, such as rotor blades, propeller blades, and jet engine compressor and turbine blades, cause a periodic modulation on the radar return signals. Though this periodic modulation can sometimes effect the Doppler tracking of the target, it can also provide important information for target identification as a radar signature. The phenomenon of the spectrum envelope modulation is analyzed in terms of electromagnetic scattering computation and experimental results of rotating blades. The results show that the blade twist is one of the important factor that impacting the spectrum distribution. -
Skolnik M I. Radar Handbook. New York: McGraw-Hill, 1970.[2]Bell M R, Grubbs R A. JEM modeling and measurement for radar target identification. IEEE Trans. on AES, 1993, 29(1): 73 - 87.[3]Martin J, Mulgrew B. Analysis of the theoretical radar return signal from aircraft propeller blades. IEEE International Radar Conference, Washington DC (USA), 1990:569 - 572.[4]Martin J, Mulgrew B. Analysis of the effects of blade pitch on the radar return signal from rotating aircraft blades. IEEE International Radar Conference, London(UK), 1992:446 - 449.[5]Yang S Y, Yeh S M. Electromagnetic backscattering from aircraft propeller blades[J].IEEE Trans. on Magnetics.1997, 33(2):1432-[6]Hynes R, Gardner R E. Doppler spectra of S band and X band signals. Supplement to IEEE Trans. on AES, 1967, 3(6):356 - 365.[7]Misiurcwicz J.[J].Kulpa K, Czekala Z. Analysis of recorded helicopter echo. Proc. IEE Radar97, Edinburgh(UK.1997,:-[8]Tardy I, Piau G P, Chabrat P, Rouch J. Computational and experimental analysis of the scattering by rotating fans. IEEE Trans. on AP, 1996, 44(10): 1414- 1421.[9]Bladel J V. Electromagnetic fields in the presence of rotating bodies[J].Proc. IEEE.1976, 64(3):301-[10]Michaeli A. Elimination of infinities in equivalent edge currents,part Ⅰ: fringe current components. IEEE Trans. on AP, 1986, 34(7):912-918. -
計(jì)量
- 文章訪問數(shù): 2283
- HTML全文瀏覽量: 119
- PDF下載量: 708
- 被引次數(shù): 0
下載:
