| 摘要: |
| 对于单通道斜视聚束SAR成像系统，舰船目标速度与斜视角在多普勒域高度耦合，极大增加了舰船速度的估计难度。基于此，本文提出了一种适用于单通道斜视聚束SAR的舰船目标速度估计方法。通过构建多普勒中心、调频率与聚焦平面舰船长轴方向的参数观测模型，显式表征了斜视角与舰船航向、航速的非线性耦合关系；在舰船速度与斜视角参数反演过程中，构建PSO-LM混合优化框架实现了非线性方程组的高效高精度求解，并进一步引入多帧观测优化了估计精度。理论分析与仿真结果表明，该方法在单通道条件下能够实现高精度的斜视聚束SAR舰船目标速度估计。 |
| 关键词: 斜视聚束SAR 单通道 舰船目标 速度估计 |
| DOI：DOI:10.3969/j.issn.1672-2337.2026.02.012 |
| 分类号:TN957.51 |
| 基金项目:国家自然科学基金（62271163） |
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| Velocity Estimation Method of Ship Targets in Single-Channel Squinted Spotlight SAR |
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LI Gen， SUN Ao， WANG Wei
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1. Unit 91550 of PLA, Dalian 116023, China;2. College of Intelligent Systems Science and Engineering，Harbin Engineering University，Harbin 150001, China;3. Postdoctoral Research Workstation Sub-Station of Unit 92493 of PLA, Dalian 116023, China
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| Abstract: |
| For the single-channel squinted spotlight SAR imaging system, the ship target velocity and squint angle are highly coupled in the Doppler domain, which greatly increases the difficulty of ship velocity estimation. Based on this, a ship target velocity estimation method is proposed for single-channel squinted spotlight SAR. By constructing the parameter observation model of the Doppler center, frequency modulation rate and the long-axis direction of the ship in the focusing plane, the nonlinear coupling relationship between the squint angle and the heading and speed of the ship is explicitly characterized. In the process of inverting the ship velocity and squint angle parameters, a PSO-LM hybrid optimization framework is constructed to achieve efficient and high-precision solution of nonlinear equations, and multi-frame observation is further introduced to optimize the estimation accuracy. Theoretical analysis and simulation results show that the proposed method can achieve high-precision velocity estimation of ship targets in squinted spotlight SAR under single-channel conditions. |
| Key words: squinted spotlight SAR single-channel ship target velocity estimation |
