基于多普勒域补偿的车载雷达距离角度联合成像算法

李毅; 夏伟杰; 周建江; 楚咏焱

doi:10.12000/JR23097

基于多普勒域补偿的车载雷达距离角度联合成像算法

DOI: 10.12000/JR23097

1.
南京航空航天大学电子信息工程学院南京 211100
2.
南京楚航科技有限公司南京 211100

基金项目: 江苏省科技成果转化专项基金(BA2021079)

详细信息

作者简介:
李　毅，博士生，主要研究方向为4D毫米波高分辨成像技术

夏伟杰，博士，教授，主要研究方向为毫米波雷达信号处理、SAR特征建模与仿真等

周建江，博士，教授，博士生导师，主要研究方向为隐身技术、雷达目标特性分析与特征控制等

楚咏焱，硕士，南京楚航科技有限公司CEO，主要研究方向为毫米波雷达工业化应用

通讯作者:
夏伟杰 nuaaxwj@nuaa.edu.cn

责任主编：陈洪猛 Corresponding Editor: CHEN Hongmeng
中图分类号: TN95
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出版历程
- 收稿日期: 2023-05-29
- 修回日期: 2023-07-30
- 网络出版日期: 2023-09-04
- 刊出日期: 2023-10-28

A Range-angle Joint Imaging Algorithm for Automotive Radar Systems Based on Doppler Domain Compensation

1.
College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
2.
Nanjing Chuhang Technology Co., Ltd., Nanjing 211100, China

Funds: Special Funds for Transformation of Scientific and Technological Achievements in Jiangsu Province, China (BA2021079)

More Information

Corresponding author: XIA Weijie, nuaaxwj@nuaa.edu.cn

摘要

摘要: 高性能、高分辨率单快拍前视成像技术是赋能车载雷达发展的关键，但距离/多普勒走动问题会限制相干积分的实施，同时系统分辨率也往往受限于硬件参数难以提高。根据车载毫米波雷达时分多输入多输出(TDM-MIMO)的前视成像体制，该文提出多普勒域补偿和点对点回波校正方法，完成多域信号解耦合，同时完成距离多普勒走动校正和多普勒解模糊。由于有限阵元数及强噪声干扰限制了传统单维度距离角度成像准确性，因此，该文提出一种基于改进贝叶斯匹配追踪方法(IBMP)的多域联合估计算法。该方法基于伯努利-高斯(BG)模型，在最大后验(MAP)准则约束下迭代更新估计参数和支撑域，实现了多维联合信号的高精度重构。仿真和实测结果表明该文方法能够有效解决距离走动问题，并提高雷达前视成像的角度分辨率，具有较强噪声鲁棒性。
- 毫米波雷达 /
- 距离走动 /
- 多普勒域补偿 /
- 多域联合估计 /
- 改进贝叶斯匹配追踪(IBMP)算法
Abstract: Single snapshot forward-looking imaging technology with high performance and resolution is crucial for enabling the development of automotive radars. However, range migration issues can limit the implementation of coherent integration methods, and improving system resolution is generally difficult due to hardware parameter limitations. Based on the Time-Division Multiplexing Multiple-Input-Multiple-Output (TDM-MIMO) forward-looking imaging systems of automotive millimeter wave radar, this paper proposes Doppler domain compensation and point-to-point echo correction measures for achieving multidomain signal decoupling. However, the accuracy of traditional single-dimension range and angle imaging is limited by the number of finite array elements and significant noise interference. Therefore, this paper proposes a multidomain joint estimation algorithm based on the Improved Bayesian Matching Pursuit (IBMP) method. The Bayesian method is based on the Bernoulli-Gaussian (BG) model, and the estimated parameters and support domain are iteratively updated in this method while adhering to the Maximum a Posteriori (MAP) criterion constraint to achieve the high-precision reconstruction of multidimensional joint signals. The final set of simulation and actual measurement results demonstrate that the proposed method can effectively solve the problem of range migration and improve the angle resolution of radar forward-looking imaging while exhibiting excellent noise robustness.
- Millimeter wave radar /
- Range migration /
- Doppler domain compensation /
- Multidomain joint estimation /
- Improved Bayesian Matching Pursuit (IBMP) algorithm

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图 1 系统配置示意图

Figure 1. System configuration diagram

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图 2 基于多普勒补偿的多维联合估计算法流程图

Figure 2. The flowchart of joint estimation algorithm based on Doppler compensation

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图 3 基于树结构的搜索策略

Figure 3. Tree-search-based search strategy

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图 4 ${{\boldsymbol{c}}}_q$的迭代更新示意图

Figure 4. The iterative process of calculating $ {{\boldsymbol{c}}}_q $

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图 5 点目标仿真

Figure 5. Point target simulation

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图 6 仿真目标速度维剖面

Figure 6. The velocity profiles of simulation target

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图 7 多普勒通道补偿影响

Figure 7. Doppler channel compensation effect

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图 8 距离角度仿真点目标分布以及成像结果对比

Figure 8. Range-angle simulation point target distribution and comparison of imaging results

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图 9 距离角度估计的NMSE对比

Figure 9. NMSE comparison of range-angle estimation

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图 10 多普勒走动、多普勒模糊实测目标成像结果对比

Figure 10. Comparison of imaging results of measured targets under Doppler walking and Doppler ambiguity

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图 11 实测目标速度维剖面

Figure 11. The velocity profiles of measured target

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图 12 400帧实测数据点云成像结果对比(颜色表示速度)

Figure 12. Comparison of point cloud imaging results from 400 frames of measured data (the color indicates the velocity of the target)

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图 13 实测成像结果对比(颜色表示速度)

Figure 13. Measured imaging results comparison (the color indicates the velocity of the target)

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1 基于MAP的贝叶斯匹配追踪方法

1. The Bayesian Matching Pursuit (BMP) based on MAP

初始化：　$\partial \left( {\mathbf{0} } \right) = \left( { - M{\text{In} }\;\pi - M{\text{In} } \;{\sigma ^2} - \dfrac{1}{ { {\sigma ^2} } }\left\\| { {\boldsymbol{Y} } } \right\\|_2^2} \right) + Q{\text{In} }\left( {1 - {p_1} } \right)$
${ { {\boldsymbol{c} } }_q} = \dfrac{ { { { {\boldsymbol{a} } }_q} } }{ { {\sigma ^2} } },{\beta _q} = \sigma _1^2{\left( {1 + \sigma _1^2{ {\boldsymbol{a} } }_q^{\text{H} }{ { {\boldsymbol{c} } }_q} } \right)^{ - 1} }$
${\partial _q} = \partial \left( {\mathbf{0} } \right) + {\text{In} }\dfrac{ { {\beta _q} } }{ { \sigma _1^2} } + {\beta _q}\left\\| {\left( { { { {\boldsymbol{Y} } }^{\text{H} } }{ { {\boldsymbol{c} } }_q} } \right)} \right\\|_2^2 + {\text{In} }\left( {\dfrac{ { {p_1} } }{ {1 - {p_1} } } } \right)$
$\varOmega = [\;],\;{ { {\boldsymbol{s} } }^{\left( 0 \right)} } = {\mathbf{0} }$
更新迭代过程：
${q^*} = {{{\rm{max}}\_{\rm{index}}} }\left( { {\partial _q} } \right)$
$\varOmega = \varOmega \cup {q^},{ { {\boldsymbol{s} } }^{\left( { {d} } \right)} } = { { {\boldsymbol{s} } }^{\left( { { {d} } - 1} \right)} } + \delta \left[ { {q^} } \right],{\partial ^{\left( d \right)} } = {\partial _{ {q^*} } }$
${ { {\boldsymbol{c} } }_q} = { { {\boldsymbol{c} } }_q} - {\beta _{ {q^} } }{ { {\boldsymbol{c} } }_{ {q^} } }({ {\boldsymbol{c} } }_{ {q} })^{\text{H} }{ { {\boldsymbol{a} } }_q}$
${\beta _q} = \sigma _1^2{\left( {1 + \sigma _1^2({ {\boldsymbol{a} } }_q)^{ {\rm{H} } }{ { {\boldsymbol{c} } }_q} } \right)^{ - 1} }$
${\partial _q} = {\partial ^{\left( d \right)} } + {\rm{In} }\dfrac{ { {\beta _q} } }{ {\sigma _\Delta ^2} } + {\beta _q}\left\\| { { { {\boldsymbol{Y} } }^{\text{H} } }{ { {\boldsymbol{c} } }_q} } \right\\|_2^2 + {\text{In} }\left( {\dfrac{ { {p_1} } }{ {1 - {p_1} } } } \right)$
输出：
${\hat { {\boldsymbol{x} } }_{ {\text{map} } } } = \sigma _1^2 \displaystyle\sum\limits_{i \in \varOmega } { {\delta _i}{ {\left( { {\boldsymbol{c} }_i^{} } \right)}^{\text{H} } }{ {\boldsymbol{Y} } } }$

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表 1 仿真实验雷达参数

Table 1. Radar parameters for simulation experiment

雷达参数	数值
载频(GHz)	77
带宽(MHz)	1500
MIMO天线配置	2T × 4R
脉冲宽度(μs)	55
脉冲采样点数K	256
脉冲个数L	256
角度分辨率(°)	15.7
距离分辨率(m)	0.1
最大不模糊速度(m/s)	8.85

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表 2 AWR1642雷达关键参数

Table 2. Radar parameters of AWR1642

雷达参数	值
载频(GHz)	77
带宽(MHz)	1500
MIMO天线配置	2T × 4R
脉冲宽度(μs)	160
脉冲采样点数K	128
脉冲个数L	15.7
角度分辨率(°)	0.1
距离分辨率(m)	0.095

下载: 导出CSV

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