| 低信噪比条件下调频率估计的子空间投影方法 |
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| 引用本文： | 马仑,廖桂生.低信噪比条件下调频率估计的子空间投影方法[J].系统仿真学报,2007,19(12):2790-2792,2797. |
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| 作者姓名： | 马仑 廖桂生 |
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| 作者单位： | 西安电子科技大学雷达信号处理重点实验室,陕西,西安,71007 |
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| 摘 要： | 当SAR回波数据的信噪比较低时,准确估计多普勒调频率变得十分困难.提出了一种基于子空间投影技术的多普勒调频率估计方法.该方法利用不同距离单元的观测矢量构造协方差矩阵,然后通过对协方差矩阵特征分解得到噪声子空间,最后将相位误差矢量向噪声子空间投影来估计多普勒调频率.在信噪比较低的条件下此方法可以稳健地估计多普勒调频率.
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| 关 键 词： | 合成孔径雷达 多普勒调频斜率 子空间投影 信噪比 |
| 文章编号： | 1004-731X（2007）12-2790-03 |
| 收稿时间： | 2006-05-11 |
| 修稿时间： | 2006-05-112006-09-15 |
Doppler Rate Estimation Method Based on Sub-space Projection Technique in Case of Low SNR |
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| MA Lun,LIAO Gui-sheng.Doppler Rate Estimation Method Based on Sub-space Projection Technique in Case of Low SNR[J].Journal of System Simulation,2007,19(12):2790-2792,2797. |
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| Authors: | MA Lun LIAO Gui-sheng |
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| Abstract: | It is difficult to estimate Doppler rate accurately when the Signal-to-noise ratio(SNR) of SAR echo is low.A Doppler rate estimation method based on sub-space projection technique was proposed.This method constructs covariance matrix by utilizing data vectors in different range lines and projects phase error vector into noise sub-space which is formed by eigendecomposing the covariance matrix.The proposed method may estimate Doppler rate robustly in the case of low SNR. |
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| Keywords: | synthetic aperture radar(SAR) doppler rate sub-space projection Signal-to-noise ratio |
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