| 通用的SAR系统分辨能力评估方法 |
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| 引用本文： | 王振东,陈溅来,孙光才,邢孟道.通用的SAR系统分辨能力评估方法[J].系统工程与电子技术,2017,39(1):57-63. |
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| 作者姓名： | 王振东 陈溅来 孙光才 邢孟道 |
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| 作者单位： | (1. 西安电子科技大学雷达信号处理国家重点实验室, 陕西 西安 710071;
2. 西安电子科技大学信息感知技术协同创新中心, 陕西 西安 710071) |
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| 摘 要： | 提出了一种通用的合成孔径雷达(synthetic aperture radar, SAR)系统分辨能力评估方法,该方法可对复杂轨迹SAR系统(比如圆轨迹,同步轨道卫星和双基地SAR等)的分辨能力进行高效率、高精度评估。首先,推导化简了模糊函数的表达式。接着,根据模糊函数在0~-3dB之间的抛物线形状特性,在满足评估精度的要求下,本文采用四次多项式来近似该模糊函数,进而得到了对SAR系统分辨能力进行评估的解析表达式。最后,圆轨迹、同步轨道卫星以及双基地SAR的仿真实验验证了该方法的有效性。
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Generalized method to analyze the resolving power of SAR systems |
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| WANG Zhendong,CHEN Jianlai,SUN Guangcai,XING Mengdao.Generalized method to analyze the resolving power of SAR systems[J].System Engineering and Electronics,2017,39(1):57-63. |
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| Authors: | WANG Zhendong CHEN Jianlai SUN Guangcai XING Mengdao |
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| Institution: | (1. National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China; 2. Collaborative;
Innovation Center of Information Sensing and Understand, Xidian University, Xi’an 710071, China) |
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| Abstract: | A generalized method is proposed to analyze the resolving power of synthetic aperture radar (SAR) systems, which can evaluate the resolving power of SAR systems with complex trajectory (such as circular, geosynchronous and bi static SAR) in high efficiency and with high precision. Firstly, the ambiguity function (AF) is deduced and simplified. Then, according to the feature that the shape of the AF between 0 and -3 dB is a parabola, the quartic polynomial is introduced to approximate the AF, which satisfies the precision request. Thus, an analytical expression to evaluate the resolving power of SAR systems is obtained. Finally, simulation experiments of circular SAR, geosynchronous SAR and bi-static SAR validate the proposed method. |
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