Design of a Multi-target Interference Resistant Adaptive Detector under Homogeneous Reverberation Backgrounds
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摘要: 为提高恒虚警方法的抗多目标干扰能力, 文中提出了一种能够对抗多目标干扰的新型自适应检测器。该检测器将参考单元作为背景环境的特征值, 利用TreeBagger算法构建估计器。在训练阶段, 利用参考单元和TreeBagger算法构建干扰目标个数估计器; 在检测阶段, 参考单元作为估计器的输入, 当前背景的干扰目标个数作为估计器的输出。进一步将估计结果作为该检测器的门限序值, 剔除干扰目标, 完成检测。利用蒙特卡洛仿真方法分析检测器在均匀混响背景和多目标干扰背景下的性能, 结果显示, 相较于现有方法, 所提方法的检测器具有更好的抗多目标干扰性能。Abstract: In this study, a new adaptive detector that can resist multi-target interference was proposed to improve the resistance to multi-target interference when using the constant false alarm rate(CFAR) method. This detector uses reference units as the feature value of the background environment and the TreeBagger algorithm for the construction of the estimator. In the training process, the reference units and TreeBagger algorithm were first used to construct the estimator, which was used to estimate the number of interference targets. In the detection process, the reference units were then used as the inputs of the estimator and the number of interference targets in the current background as the output of the estimator. Furthermore, the estimation results were used as the sequence threshold for the detector. Consequently, the detector was able to eliminate the interference targets and complete detection. The performance of the detector under homogeneous reverberation and multi-target interference backgrounds was then analyzed using the Monte Carlo simulation method, and a comparison of the results with those of existing methods was conducted, which showed that the proposed detector had a better performance at resisting multi-target interference.
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Key words:
- constant false alarm rate /
- interference resistance /
- multi-target /
- adaptive detector
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图 2 校正决定系数随样本个数变化曲线
Figure 2. The curve of the adjusted coefficient of determination with the number of samples
图 3 校正决定系数随参考单元个数变化曲线
Figure 3. The curve of the adjusted coefficient of determination with the number of reference units
图 4 OOB拟合误差随树的个数变化曲线
Figure 4. The curve of the fitting errors of OOB with the number of trees
图 5 参考单元个数随预测耗时变化曲线
Figure 5. The curve of the reference units with the time of predict
图 6 均匀背景下各检测器检测性能
Figure 6. Detection performance of detectors in the homo- geneous environment
图 7 前沿滑窗有2个干扰目标时检测器检测性能
Figure 7. Detection performance of detectors when the front reference units have two interfering targets targets
图 8 前沿滑窗有4个干扰目标时检测器检测性能
Figure 8. Detection Performance of detectors when the front reference units have four interfering targets
图 9 前沿滑窗有6个干扰目标时检测器检测性能
Figure 9. Detection performance of detectors when the front reference units have six interfering targets
图 10 前后滑窗均有2个干扰目标时检测器检测性能
Figure 10. Detection performance of detectors when the front and back units both have two interfering targets
图 11 前后滑窗均有4个干扰目标时检测器检测性能
Figure 11. Detection Performance of detectors when the front and back units both have four interfering targets
图 12 前后滑窗均有6个干扰目标时检测器检测性能
Figure 12. Detection performance of detectors when the front and back units both have six interfering targets
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