时钟自同步的分布式雷达运动目标定位方法
收稿日期: 2024-10-09
修回日期: 2024-11-15
录用日期: 2025-01-03
网络出版日期: 2025-01-21
基金资助
湖南省自然科学基金(2023JJ40680)
A clock self-synchronized moving target localization method in distributed radar system
Received date: 2024-10-09
Revised date: 2024-11-15
Accepted date: 2025-01-03
Online published: 2025-01-21
Supported by
Natural Science Foundation of Hunan Province(2023JJ40680)
对于布设在分布式移动平台上的雷达节点，当前技术手段无法实现雷达节点间精准的时钟同步，非理想时钟同步将导致信号时延、多普勒频率测量不准确，现有方法无法有效定位目标。针对分布式雷达授时同步后雷达节点间存在时钟同步误差下的运动目标定位问题，提出了一种时钟自同步的运动目标定位方法，即在估计出目标位置速度的同时校正雷达节点间时钟同步误差，优化时钟同步参数。具体的，基于最大似然-最大后验概率估计理论提出了一种运动目标定位与时钟同步算法，算法首先给出了先运动目标位置速度后时钟同步误差的估计流程；然后针对运动目标位置速度估计，提出了一种解析初始值求解和参数估计迭代优化的目标定位方法，并在运动目标参数估计值的基础上实现了对雷达节点间时钟同步误差的校正估计。实验结果表明：提出的时钟自同步运动目标定位方法能够以低运算复杂度有效地估计出目标位置速度以及雷达节点间时钟同步误差。
宋海波 , 王杰 , 吴国福 , 范才智 , 文贡坚 . 时钟自同步的分布式雷达运动目标定位方法[J]. 航空学报, 2025 , 46(12) : 331365 -331365 . DOI: 10.7527/S1000-6893.2025.31365
Current technological methods cannot achieve precise clock synchronization among radar nodes when they are deployed on distributed mobile platforms. Besides， non-ideal clock synchronization among the radar nodes will result in inaccurate time delay and Doppler shift measurements of the signal， making existing methods effective in target localization. For the moving target localization problem in presence of clock synchronization errors among radar nodes after distributed radar time synchronization， this paper proposes a clock self-synchronized target localization method，which estimates the position and velocity of the moving target while correcting the clock synchronization errors among the radar nodes and optimizing the clock synchronization parameters. Specifically， based on the hybrid maximum likelihood and maximum a posteriori probability estimation theory， a moving target localization and clock synchronization algorithm is recommended. This algorithm first lists the estimation process of estimating the moving target position and velocity； then， estimates the clock synchronization errors. To estimate the moving target position and velocity， a localization method based on analytical initial value solving and parameter estimation iterative optimization is proposed.Based on the estimate of the moving target， the clock synchronization errors among the radar nodes are figured out.The experimental results show that the proposed clock self-synchronized target localization method can effectively estimate the position and velocity of the moving target and the clock synchronization errors among the radar nodes with low computational complexity.
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