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

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

李悅麗¹

基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目(61302146)

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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

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

LI Yueli¹

Funds:

The National Natural Science Foundation of China (61302146)

摘要

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。
- 雷達(dá) /
- 自適應(yīng)濾波器 /
- 射頻干擾抑制 /
- 歸一化最小均方誤差算法 /
- 旁瓣抑制
Abstract: The performance of low frequency Ultra-Wide-Band (UWB) Synthetic Aperture Radar (SAR) is seriously affected by narrow band Radio Frequency Interference (RFI) in the VHF/UHF band. RFI suppression, by placing notches over the energy spectra to remove the RFI spikes, results energy loss of the wide-band signals and raises the range direction side-lobes. This paper presents an approach to suppress the side-lobe in range direction caused by adaptive filtering. After clipping main energy of strong scatterers in range compression domain before RFI estimation, the interference signals are estimated using an Adaptive Line Enhancer (ALE) and subtracted from the radar echo. The clipping approach makes use of the different time-domain characteristics between wide-band signal and narrow band interference, and by using pulse compression technology the method can be processed efficiently. To investigate the performance of RFI suppression, clipping of strong scatterers is combined to the ALE based on Normalized Least Mean Square (NLMS) algorithm. Simulation results and experimental data test compared with the conventional algorithms suggest that side-lobes of the strong scatters can be reduced effectively in RFI suppression.
- Radar /
- Adaptive filter /
- Radio Frequency Interference (RFI) suppression /
- Normalized Least Mean Square (NLMS) algorithm /
- Side-lobe reduction

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參考文獻(xiàn)(19)

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