王小青4,
种劲松1, 2,,
1.中国科学院电子学研究所 ??北京 ??100190
2.微波成像技术国家重点实验室 ??北京 ??100190
3.中国科学院大学 ??北京 ??100049
4.中国科学院微电子研究所 ??北京 ??100029
详细信息
作者简介:魏翔飞：男，1991年生，博士生，研究方向为SAR海洋成像
王小青：男，1978年生，副研究员，研究方向为SAR海洋遥感应用与机理
种劲松：女，1969年生，研究员，博士生导师，研究方向为海洋微波遥感
通讯作者:种劲松 iecas_chong@163.com
中图分类号:TN957.52计量
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被引次数:0
出版历程
收稿日期:2017-10-23
修回日期:2018-06-08
网络出版日期:2018-07-12
刊出日期:2018-09-01
Ship Azimuthal Speed Estimation Method Based on Local Region Doppler Centroid in SAR Images
Xiangfei WEI1, 2, 3,Xiaoqing WANG4,
Jinsong CHONG1, 2,,
1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2. National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
摘要
摘要:针对现有船速估计算法大多数只能估计出舰船距离向速度的问题，该文提出一种基于合成孔径雷达(SAR)图像局域中心频率的舰船方位向速度估计方法。首先分析了动目标在SAR图像局域多普勒中心频率的变化规律，并推导了利用中心频率变化率估计目标方位向速度的理论公式。然后给出了根据SAR图像局域方位向功率谱的概率密度函数，利用最大似然估计算法估计中心频率变化率的方法。同时，对所提方法的精度与适用性应用性进行分析。最后，通过仿真和实测数据，将该方法的估计结果与直接计算调频率获得的结果进行对比分析。结果表明，相对于调频率法，该方法具有更高的估计精度，验证了所提方法的有效性。
关键词:SAR图像/
舰船速度估计/
局部区域/
中心频率
Abstract:To deal with the problem that most of the existing ship speed estimation algorithms can only estimate the slant range speeds of ships, a ship azimuthal speed estimation method based on local region Doppler centroid for Synthetic Aperture Radar (SAR) images is proposed. Firstly, the variation of Doppler centroid of moving target in local region of SAR image is analyzed and the theoretical formula for estimating the azimuthal speed using the slope of Doppler centroid variation is derived. Then, based on the probability density function of azimuthal power spectrum, an estimation method for the slope of Doppler centroid variation using the maximum likelihood estimation algorithm is presented. Moreover, the estimation accuracy and the applicability of the proposed method are also analyzed. Finally, the proposed method is implemented on simulated and filed data and the estimation results are compared with those obtained by directly calculating the frequency modulation rate. The results show that the proposed method has high estimation accuracy, which verifies the effectiveness of the proposed method.
Key words:SAR image/
Ship speed estimation/
Local region/
Doppler centroid
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