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基于強(qiáng)散射點(diǎn)剔除的自適應(yīng)窄帶RFI抑制濾波器

李悅麗

李悅麗. 基于強(qiáng)散射點(diǎn)剔除的自適應(yīng)窄帶RFI抑制濾波器[J]. 電子與信息學(xué)報(bào), 2016, 38(7): 1758-1764. doi: 10.11999/JEIT151110
引用本文: 李悅麗. 基于強(qiáng)散射點(diǎn)剔除的自適應(yīng)窄帶RFI抑制濾波器[J]. 電子與信息學(xué)報(bào), 2016, 38(7): 1758-1764. doi: 10.11999/JEIT151110
LI Yueli. Narrow Band RFI Suppression via Adaptive Filtering with Clipping of Strong Scatterers[J]. Journal of Electronics & Information Technology, 2016, 38(7): 1758-1764. doi: 10.11999/JEIT151110
Citation: LI Yueli. Narrow Band RFI Suppression via Adaptive Filtering with Clipping of Strong Scatterers[J]. Journal of Electronics & Information Technology, 2016, 38(7): 1758-1764. doi: 10.11999/JEIT151110

基于強(qiáng)散射點(diǎn)剔除的自適應(yīng)窄帶RFI抑制濾波器

doi: 10.11999/JEIT151110
基金項(xiàng)目: 

國家自然科學(xué)基金項(xiàng)目(61302146)

Narrow Band RFI Suppression via Adaptive Filtering with Clipping of Strong Scatterers

Funds: 

The National Natural Science Foundation of China (61302146)

  • 摘要: 在低頻超寬帶合成孔徑雷達(dá)中,VHF/UHF頻段密集的窄帶射頻干擾(RFI)嚴(yán)重影響了雷達(dá)性能。常規(guī)RFI抑制濾波器在干擾頻點(diǎn)的陷波造成了寬帶信號的能量損失,抬高了點(diǎn)目標(biāo)的距離向旁瓣。該文提出一種可減小自適應(yīng)濾波器旁瓣效應(yīng)的方法:通過在距離壓縮域剔除場景內(nèi)的強(qiáng)散射點(diǎn),減小輸入信號中的寬帶目標(biāo)信號能量,提高自適應(yīng)譜線增強(qiáng)器(ALE)對窄帶干擾估計(jì)的精度,再從原始信號中減去干擾即得到目標(biāo)回波信號。這種剔除強(qiáng)散射點(diǎn)的方法利用了匹配濾波后寬帶信號與窄帶干擾的時(shí)域特性差異,能有效降低自適應(yīng)濾波器的旁瓣效應(yīng)。該文選擇歸一化最小均方誤差(NLMS)算法對剔除強(qiáng)散射點(diǎn)的自適應(yīng)窄帶RFI抑制濾波器進(jìn)行了性能評估,與傳統(tǒng)算法的對比試驗(yàn)表明該方法可在抑制RFI的同時(shí)有效減小強(qiáng)目標(biāo)的距離向旁瓣。
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出版歷程
  • 收稿日期:  2015-09-26
  • 修回日期:  2016-04-22
  • 刊出日期:  2016-07-19

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