Weak Target Detection Based on the Average Bandwidth of the Partial Hilbert Spectrum
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摘要: 该文采用实测海杂波数据分析了目标出现频段内海杂波局部Hilbert谱的脊线及其平均带宽，研究了目标和天线极化方式对海杂波局部Hilbert谱脊线及其平均带宽的影响。研究发现，目标的出现将导致目标所处频段的海杂波局部Hilbert谱脊线起伏趋于和缓，局部Hilbert谱平均带宽减小，在此基础上，借鉴恒虚警检测技术提出了一种新的微弱目标检测算法。该算法先采用目标所处频段的局部Hilbert谱脊线计算平均带宽，以提取目标与海杂波的差异，然后将平均带宽作为检测统计量，实现对海杂波中的微弱目标进行检测。与基于海杂波盒维数的方法和单元平均恒虚警(CA-CFAR, 100个脉冲)方法相比，该方法有效提高了对海杂波中微弱目标的检测性能。
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关键词:
- 目标检测 /
- 海杂波 /
- Hilbert-Huang 变换 /
- 平均带宽
Abstract: In the paper, the partial Hilbert spectrum near the frequency of the target ridge and average bandwidth of the real sea clutter data is analyzed, and the influence of the target and polarization on the ridge and the average bandwidth of the partial Hilbert spectrum are discussed. As shown of the result, the appearance of the target will smooth its ridge and decrease its average bandwidth, on the base of the result, a novel method is proposed to detect the weak target in the sea clutter, where the average bandwidth is calculated by the partial Hilbert spectrum near the frequency of the target ridge to extract the difference of the target and the sea clutter, then it is used as the detection statistic to detect the weak target in the sea clutter. Compared with the target detection method directly using the box dimension and the Cell Average-Constant False Alarm Rate (CA-CFAR, 100 pulses), the proposed method improves the detection performance of the weak target in the sea clutter distinctly.-
Key words:
- Target detection /
- Sea clutter /
- Hilbert-Huang Transformation (HHT) /
- Average bandwidth
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