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arXiv 2101.12445eess.SP
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基于稀疏性的自编码器去噪杂波雷达信号

Sparsity Based Autoencoders for Denoising Cluttered Radar Signatures

Shobha Sundar Ram, Shelly Vishwakarma, Akanksha Sneh, Kainat Yasmeen

摘要:

窄带和宽带室内雷达图像显着恶化存在的目标相关和独立的静态和动态杂波引起的墙壁。提出了一种用于抑制室内雷达图像墙壁杂波的堆叠稀疏去噪自编码器(StackedSDAE)。该算法依赖于训练过程中干净图像和相应噪声图像的可用性,并且不需要关于壁特征的额外信息。该算法进行了评估模拟多普勒时间谱图和高距离分辨率剖面产生的不同的雷达频率和墙壁特性在转角雷达(ACR)的情况下。额外的实验进行范围增强的正面图像从测量收集从宽带RF成像传感器。实验结果表明,StackedSDAE成功地重建了与自由空间条件下获得的图像非常相似的图像。此外,在自动编码器内的隐藏层表示中结合稀疏性和深度使得该算法比传统的单层DAE对训练期间干净数据和损坏数据之间的低信噪比(SNR)和标签失配更鲁棒。例如,去噪的ACR签名在SNR为-10dB和标签失配误差为50%的情况下示出了与干净的自由空间图像的高于0.75的结构相似性。

英文摘要:

Narrowband and broadband indoor radar images significantly deteriorate in the presence of target dependent and independent static and dynamic clutter arising from walls. A stacked and sparse denoising autoencoder (StackedSDAE) is proposed for mitigating wall clutter in indoor radar images. The algorithm relies on the availability of clean images and corresponding noisy images during training and requires no additional information regarding the wall characteristics. The algorithm is evaluated on simulated Doppler-time spectrograms and high range resolution profiles generated for diverse radar frequencies and wall characteristics in around-the-corner radar (ACR) scenarios. Additional experiments are performed on range-enhanced frontal images generated from measurements gathered from a wideband RF imaging sensor. The results from the experiments show that the StackedSDAE successfully reconstructs images that closely resemble those that would be obtained in free space conditions. Further, the incorporation of sparsity and depth in the hidden layer representations within the autoencoder makes the algorithm more robust to low signal to noise ratio (SNR) and label mismatch between clean and corrupt data during training than the conventional single layer DAE. For example, the denoised ACR signatures show a structural similarity above 0.75 to clean free space images at SNR of -10dB and label mismatch error of 50%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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