四元十字阵的测向和测距精度受目标方位角的影响，而五元十字阵就可以克服这一缺点。
The accuracy of Angle and range estimation of acoustic localization method based on four-element sensor array is influenced by target azimuth Angle.
方位角联合估计方法有利于增强目标方位角估计的适应性，提高目标分类和识别的效率。
The combined method can improve the adjustability of azimuth estimation, and then can facilitate target classification and recognition effectively.
提出一种以目标检测、目标分割、目标方位角估计和目标不变性特征提取为线索的SAR目标识别框架。
We propose a multistage SAR target recognition process based on target detection, target segmentation, target aspect estimation and invariant feature extraction.
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