对称目标的ISAR成像横向距离定标方法与性能分析
doi: 10.3724/SP.J.1146.2008.01282
Cross-Range Scaling Method and Performance Analysis of ISAR Imaging for Symmetrical Target
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摘要: 目标横向定标是实现目标模板匹配识别和特征提取的基础。该文利用横向多普勒频率和横向坐标位置的近似正比关系，基于对称目标的对称轴垂直于对称点直线，给出了对称目标转角估计和横向定标新方法。其次给出了定标参数估计误差表达式，定量分析了影响定标参数估计误差的各因素。最后用弹头模型转台成像和外场飞机ISAR数据成像对该方法进行了仿真验证。该方法结构简单，运算量非常小，在合作机动目标ISAR成像定标方面有很好的应用前景。Abstract: The cross-range scaling is the base of the pattern matching and target characteristic extraction. Using the approximately proportional relation between the Doppler frequency in cross range and the transverse coordinate position, and based on the orthogonal relation between the centerline and the line through axially symmetric points in the symmetrical target, a novel method of rotation angle estimation and cross range calibration is given for the symmetrical target. Then, the estimation error expression of the scaling parameter is offered, and influencing factors of the parameter estimation error is analyzed quantitatively. Finally, the ISAR imaging simulation results of both the warhead model on rotating platform and the outfield airplane data verify this method. This method has a very good application prospect to the ISAR image calibration aspect of cooperative maneuvering target with simple and low computation cost.
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