| 摘要: |
| 针对运动目标成像散焦和处理实时性问题，提出了一种运动目标成像快速二次聚焦方法。该方法首先对图像进行目标粗检测，根据目标粗检测形成的目标位置和尺寸信息完成运动目标数据的选取，接着利用图像信息熵最小准则对运动目标的残余调频率进行估计，使用估计得到的运动目标残余调频率构建二次聚焦方位匹配滤波器，利用该滤波器对运动目标进行方位脉压，从而完成运动目标成像的二次聚焦。文中设计了一种运动目标调频率估计快速收敛方法大幅提高了二次聚焦的实时性，挂飞实验结果验证了本方法的有效性。 |
| 关键词: 运动目标，信息熵，检测识别，二次聚焦 |
| DOI： |
| 分类号:TN957 |
| 基金项目: |
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| A Fast Secondary Focusing Method for Moving Target Imaging |
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胡虹, 常沛
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| Abstract: |
| A fast secondary focusing method for moving target imaging is proposed to address the problem of defocusing and real-time processing in moving target imaging. The method first performs coarse target detection on the image and selects the moving target data based on the target position and size information obtained from the coarse detection. Then it estimates the residual azimuth FM rate of the moving target using the minimum entropy criterion of image information. Using the estimated residual azimuth FM rate, a secondary focusing azimuth matching filter is constructed to perform azimuth pulse compression on the moving target, thereby achieving secondary focusing of the moving target image. Additionally, the moving target image data after secondary focusing is overlaid with the corresponding position data in the original RD image. The method incorporates a fast convergence technique for azimuth FM rate estimation, significantly improving the real-time performance of secondary focusing. The effectiveness of the method is validated through flight test results. |
| Key words: moving target information entropy detection and recognition secondary focusing |