基于模型阶数选择准则的稳健杂波边缘检测方法

金禹希; 吴敏; 郝程鹏; 殷超然; 吴永清; 闫林杰

doi:10.11999/JEIT230999

基于模型阶数选择准则的稳健杂波边缘检测方法

doi: 10.11999/JEIT230999

1.
中国科学院声学研究所北京 100190
2.
中国科学院大学北京 100049

基金项目: 国家自然科学基金(62001468, 61971412, 62071460, 62371446, 62201564)

详细信息

作者简介:
金禹希：女，博士生，研究方向为阵列信号处理、目标检测与估计

吴敏：女，副研究员，研究方向为水声信号处理，目标探测与成像

郝程鹏：男，研究员，研究方向为水声信号处理、阵列信号处理、信号检测与估计、水下无人系统设计

殷超然：男，特别研究助理，研究方向为水声信号处理、阵列信号处理、目标检测与估计

吴永清：男，研究员，水声定位、水下目标探测与识别

闫林杰：女，特别研究助理，研究方向为水声信号处理、阵列信号处理、目标检测与估计

通讯作者:
郝程鹏　haochengp@mail.ioa.ac.cn

中图分类号: TN957.51
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- 被引次数: 0
出版历程
- 收稿日期: 2023-09-13
- 修回日期: 2024-01-17
- 网络出版日期: 2024-02-04
- 刊出日期: 2024-07-29

A Robust Clutter Edge Detection Method Based on Model Order Selection Criterion

1.
Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences , Beijing 100049, China

Funds: The National Natural Science Foundation (62001468, 61971412, 62071460, 62371446, 62201564)

摘要

摘要: 在雷达目标自适应检测问题当中，辅助数据存在杂波边缘的情况将导致杂波协方差矩阵(CCM)的估计性能出现严重下降，极大地影响目标检测性能。为了解决这一问题，该文提出一种杂波边缘检测方法，能够对辅助数据中杂波边缘数量与位置进行自适应判别。首先，假定辅助数据中存在杂波边缘，采用模型阶数选择算法和最大似然估计方法完成杂波参数估计，其中杂波边缘位置由循环搜索方法得到。之后将杂波参数估计结果应用到检测算法中，通过广义似然比检验方法来判断杂波边缘是否存在。此外为了进一步提升算法在小样本条件下的稳健性，引入CCM的特殊结构作为先验知识，将算法推广至CCM为斜对称、谱对称以及中心对称3种结构的情况。仿真及实测数据均表明该文所提算法能够高效地识别雷达辅助数据中的杂波边缘数量和位置，先验知识的引入更能进一步改善算法在辅助数据量较小时的性能。
- 自适应雷达检测 /
- 杂波分类 /
- 杂波边缘 /
- 知识辅助
Abstract: In the radar target adaptive detection problem, the presence of clutter edges in the auxiliary data will cause a serious decrease in the estimation performance of the Clutter Covariance Matrix (CCM), which greatly affects the target detection performance. In order to solve this problem, a clutter edge detection method is proposed, which can adaptively discriminate the number and position of clutter edges in auxiliary data. Firstly, assuming the presence of clutter edges in the auxiliary data, the model order selection algorithm and the maximum likelihood estimation method are used to complete the clutter parameter estimation, and the clutter edge position is obtained by the cyclic search method. Then, the clutter parameter estimation results are applied to the detection algorithm, and the existence of clutter edges is determined by the generalized likelihood ratio test method. In addition, in order to further improve the robustness of the algorithm under the condition of small samples, the special structure of CCM is introduced as a priori knowledge, and the algorithm is generalized to the situation where CCM is persymmetry, spectrum symmetry and central-symmetry. Both simulation and measured data show that the proposed algorithm can efficiently identify the number and location of clutter edges in radar auxiliary data, and the introduction of prior knowledge can further improve the performance of the algorithm when the amount of auxiliary data is small.
- Adaptive radar detection /
- Clutter classification /
- Clutter edge /
- Knowledge-based

HTML全文

图 1 不同协方差矩阵结构下保证收敛的最小迭代次数

下载: 全尺寸图片幻灯片

图 2 不同协方差矩阵结构的$ {P_{\mathrm{d}}} $, $ {P_{{\mathrm{cc}}}} $以及RMSE随CPR的变化情况($ {m} = 4 $)

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图 3 AIC准则下表1所示不同情况的$ {P_{\mathrm{d}}} $, $ {P_{{\mathrm{cc}}}} $以及RMSE随CPR的变化情况(协方差矩阵为中心对称结构)

下载: 全尺寸图片幻灯片

图 4 不同距离单元的平均能量

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图 5 距离单元-脉冲2维图

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图 6 杂波边缘数的估计结果

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图 7 杂波边缘位置的估计结果

下载: 全尺寸图片幻灯片

1 杂波分类及参数估计流程

输入：$ {\boldsymbol{Z}} $, $ {{m}_{\max}} $, $ {L} $，收敛阈值$ \kappa $。
for $ m = 1,2,\cdots ,{m_{\max }} $
初始化：$ {t} = 0 $, $ {L}_{j}^{(0)} = \dfrac{{{L} \times {j}}}{{m}},{j} = 1,2,\cdots ,{m} - 1 $
重复迭代：
$ {t} = {t} + 1 $
for $ j = 1,2,\cdots ,m - 1 $
利用式(10)估计$ \hat {L}_{j}^{({t})} $。
end
利用式(2)计算当前对数似然函数$ {\left( {\ln {f_1}\left( {\boldsymbol{Z}} \right)} \right)^{\left( t \right)}} $，
直至满足收敛条件：　　　　$ {\left\\| {{{\left( {\ln {f_1}\left( {\boldsymbol{Z}} \right)} \right)}^{\left( t \right)}} - {{\left( {\ln {f_1}\left( {\boldsymbol{Z }}\right)} \right)}^{\left( {t - 1} \right)}}} \right\\|_2} \le \kappa $。
end
利用式(4)计算$ \hat {m} $。
利用式(12)判断环境是否均匀。
输出：$ \hat {m} $及$ {\hat {\boldsymbol{\varXi}} _{m}} $。

下载: 导出CSV

表 1 仿真参数设置

参数名称	情况1	情况2	情况3
杂波边缘数	1	2	3
杂波边缘位置$ {{\boldsymbol{\varXi}} _m} $	$ \left[ {60} \right] $	$ \left[ {60,90} \right] $	$ \left[ {30,60,90} \right] $

下载: 导出CSV

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