基于RANSAC和三维谱峰分析的全姿态散射中心建模

靳明振; 杨申; 吴中杰; 张会强; 刘盛启

doi:10.12000/JR23113

基于RANSAC和三维谱峰分析的全姿态散射中心建模

DOI: 10.12000/JR23113

1.
国防科技大学ATR重点实验室长沙 410073
2.
中国兵器工业集团第二〇六研究所西安 710100

基金项目: 国家自然科学基金 (62201587, 62001486)，湖南省自然科学基金青年项目基金 (2022JJ40562)

详细信息

作者简介:
靳明振，博士生，研究方向为雷达目标散射特性参数化建模、雷达回波模拟等

杨　申，硕士，工程师，研究方向为雷达系统设计、雷达信号处理等

吴中杰，博士，讲师，研究方向为认知雷达、雷达波形分集与设计、雷达目标特性与识别等

张会强，博士生，研究方向为雷达目标特性与识别等

刘盛启，博士，副研究员，研究方向为雷达目标特性与识别、雷达导引头抗干扰等

通讯作者:
吴中杰 hit_wzj@163.com

责任主编：殷红成 Corresponding Editor: YIN Hongcheng
中图分类号: TN957
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出版历程
- 收稿日期: 2023-06-26
- 修回日期: 2023-09-07
- 网络出版日期: 2023-09-19
- 刊出日期: 2024-04-28

Global Scattering-center Modeling Based on RANSAC and 3D Spectral Peak Analysis

1.
ATR Key Laboratory, National University of Defense Technology, Changsha 410073, China
2.
China Ordnance Industry Group 206 Research Institute, Xi’an 710100, China

Funds: The National Natural Science Foundation of China (62201587, 62001486), Hunan Provincial Natural Science Foundation Youth Project Fund (2022JJ40562)

More Information

Corresponding author: WU Zhongjie, hit_wzj@163.com

摘要

摘要: 全姿态散射中心模型是一种性能优良的光学区复杂目标电磁散射参数化模型。针对传统的基于候选点筛选和聚类的全姿态散射中心建模方法易出现虚假散射中心和遗漏真实散射中心的问题，该文提出了一种基于目标三维空间电磁散射强度场谱峰分析的建模方法。首先，基于目标多视一维散射中心参数，利用随机采样一致性(RANSAC)方法和Parzen窗函数方法估计目标在三维空间中的电磁散射强度场。然后，通过谱峰分析、散射中心关联和多视量测融合，得到全姿态三维散射中心的位置。最后，利用二值形态学处理修正全姿态散射中心的角度可见性，估计全姿态散射中心的散射系数和类型参数。仿真结果表明，该文方法所提取的全姿态散射中心与目标几何结构具有极强的关联性，相较传统方法，在缩减三维散射中心数量的同时提升了模型的表示精度。
- 宽带雷达 /
- 目标雷达特性 /
- 全姿态散射中心模型 /
- 随机抽样一致 /
- 谱峰搜索
Abstract: The global scattering-center model is a high-performance electromagnetic scattering parametric model for complex targets in an optical region. The traditional methods for constructing global scattering models are usually based on candidate-point screening and clustering and are prone to producing false scattering centers and ignoring actual scattering centers. To address this issue, this study proposes a novel modeling method based on the spectral peak analysis of the target electromagnetic scattering intensity field. First, the three-dimensional (3D) electromagnetic scattering intensity field of the target is estimated based on the multiperspective, one-dimensional scattering-center parameters of the target using the RANdom SAmple Consensus (RANSAC) and Parzen window methods. Next, the positions of the global 3D scattering centers are determined through spectral peak analysis, scattering-center association, and multivision measurement fusion. Finally, the scattering coefficients and type parameters of the global scattering centers are estimated after the visibility of the global scattering center is corrected through binary image morphological processing. Simulation results demonstrate that the global scattering center model extracted using this method, which is highly consistent with the geometrical structure of the target, achieves higher expression accuracy while using fewer scattering centers than those used in traditional methods.
- Wideband radar /
- Target radar characteristic /
- Global scattering center model /
- RANdom SAmple Consensus (RANSAC) /
- Peak search

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图 1 全姿态散射中心建模算法流程

Figure 1. The algorithmic flow for global scattering center modeling

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图 2 目标三维空间电磁散射强度场估计算法流程

Figure 2. The algorithmic flow for the estimation of the target’s 3D space electromagnetic scattering intensity field

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图 3 目标全姿态三维散射中心位置估计算法流程

Figure 3. The algorithmic flow for the estimation of the target’s global 3D scattering center position

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图 4 目标全姿态三维散射中心类型参数和散射系数估计算法流程

Figure 4. The algorithmic flow for the estimation of the target’s global 3D scattering center type parameters and scattering coefficients

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图 5 简单目标全姿态散射中心提取结果图

Figure 5. The global scattering center extraction result of the simple target

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图 6 某巡航导弹的三维CAD模型

Figure 6. 3D CAD model of a certain cruise missile

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图 7 给定俯仰角时目标的高分辨距离像和一维散射中心估计结果

Figure 7. High-resolution range image and one-dimensional scattering center estimation result of the target at a given pitch angle

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图 8 目标三维空间电磁散射强度场

Figure 8. The target’s electromagnetic scattering intensity field in three-dimensional space

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图 9 目标全姿态散射中心位置

Figure 9. The positions of the target’s global scattering centers

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图 10 全姿态散射中心可见性图

Figure 10. The visibility maps of the global scattering centers

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图 11 俯仰角为45°时由全局散射中心模型重构的高分辨距离像

Figure 11. Original and reconstructed high resolution range profiles at the pitch angle of 45°

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图 12 原始与重构目标高分辨距离像

Figure 12. Original and reconstructed high resolution range profiles of the target

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图 13 原始与重构目标窄带RCS

Figure 13. Original and reconstructed narrowband RCS of the target

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图 14 相关系数的分布直方图

Figure 14. Distribution histogram of the correlation coefficients

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表 1 不同机理的散射中心的类型参数取值

Table 1. Values of type parameters for scattering centers of different mechanisms

$ {\text{ }}{\alpha _m} $取值	散射机理
–1	角绕射，尖顶绕射
–1/2	边缘绕射
0	点散射，双曲面反射，直边镜面反射
1/2	单曲面反射
1	平板法向发射，二面角反射，三面角反射

下载: 导出CSV

表 2 简单目标的全姿态散射中心参数表

Table 2. Parameter table of the global scattering centers of the simple target

编号	空间位置(x,y,z)	散射强度	散射类型
1	(3,2,1)	74.56–66.64j	0
2	(–2,1,0.5)	46.10–38.40j	–1/2
3	(4,–0.2,0.2)	–84.22+31.74j	1/2
4	(–3,–2.2,1.2)	–36.64+16.04j	1

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表 3 100次蒙特卡罗仿真实验结果对比

Table 3. Comparison of 100 Monte Carlo simulation experimental results

方法	虚假散射中心个数			平均运行时长(s)			位置估计误差(m)
方法	5 dB	10 dB	15 dB	5 dB	10 dB	15 dB	5 dB	10 dB	15 dB
修正RANSAC法	5.58	5.49	3.47	59.42	51.22	24.43	0.0732	0.0734	0.0635
霍夫变换法	3.34	3.23	2.19	3639	3545	3378	0.0163	0.0155	0.0131
本文方法	0	0	0	17.26	16.45	9.690	0.0012	0.0012	0.0010

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表 4 目标全姿态散射中心与目标部件的对应关系

Table 4. Correspondence between the global scattering centers and the target components

散射中心编号	与散射中心相关的目标部件
1	鼻锥
7, 10, 11	右主翼
8, 9, 12	左主翼
2, 3, 4, 5, 6	尾翼

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表 5 不同信号带宽和俯仰角范围组合条件下全姿态散射中心模型的性能

Table 5. Performance of the global scattering center model under various combinations of signal bandwidth and pitch angle domain

带壳	重构模型指标	散射中心数量	平均相关系数	相关系数大于 0.8的比例
250 MHz	70°～110°	9	0.98	1.00
250 MHz	45°～135°	10	0.96	0.96
500 MHz	70°～110°	11	0.96	0.95
500 MHz	45°～135°	12	0.96	0.97

下载: 导出CSV

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