Analog Beamforming and Digital Beamforming on Receive for Range Ambiguity Suppression in Spaceborne SAR
Analog Beamforming and Digital Beamforming on Receive for Range Ambiguity Suppression in Spaceborne SAR
复制标题
星载 SAR 中距离模糊度抑制的接收模拟波束成形和数字波束成形
DOI：
10.1155/2015/182080
复制
发表时间：
2015-02
影响因子：
1.5
通讯作者：
Wei Xu
中科院分区：
文献类型：
--
作者：
Pingping Huang;Wei Xu
在未来的星载合成孔径雷达（SAR）任务中，将采用仰角接收数字波束形成尖锐的高接收波束，以提高信噪比和抑制距离模糊。然而，在某些特殊情况下，接收波束增益较高的光栅瓣可能会接收到距离模糊，并且距离模糊不能很好地抑制，甚至可能增加。本文提出了一种基于模拟波束形成（ABF）和DBF的接收方法。根据星载SAR成像几何形状和选定的脉冲重复频率（PRF），首先利用脉冲重复频率对整个接收天线各子孔径的天线方向图进行高程调整。之后，来自仰角上所有子孔径的信号由机载实时DBF处理器组合。由于光栅瓣可以通过ABF被子孔径的天线方向图抑制，因此即使光栅瓣接收到模糊，距离模糊也能得到很好的抑制。仿真结果验证了该方法的有效性。
For future spaceborne synthetic aperture radar (SAR) missions, digital beamforming (DBF) on receive in elevation to form a sharp high receive beam will be adopted to improve the signal to noise ratio (SNR) level and suppress range ambiguities. However, in some special cases, range ambiguities may be received by grating lobes with the high receive beam gain, and range ambiguities would not be well suppressed and even may be increased. In this paper, a new receiving approach based on analog beamforming (ABF) and DBF is proposed. According to the spaceborne SAR imaging geometry and the selected pulse repetition frequency (PRF), the antenna patterns of all subapertures of the whole receive antenna in elevation are adjusted by ABF at first. Afterwards, signals from all subapertures in elevation are combined by a real time DBF processor onboard. Since grating lobes could be suppressed by the antenna pattern of the subapertures via ABF, range ambiguities would be well suppressed even if ambiguities are received by grating lobes. Simulation results validate the proposed approach.
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影响因子：
8.2
作者：
Fan Feng;Shiqiang Li;Weidong Yu;Pingping Huang;W. Xu
通讯作者：
Fan Feng;Shiqiang Li;Weidong Yu;Pingping Huang;W. Xu
影响因子：
2.6
作者：
D. D'Aria;F. Zan;D. Giudici;A. M. Guarnieri;F. Rocca
通讯作者：
D. D'Aria;F. Zan;D. Giudici;A. M. Guarnieri;F. Rocca
DOI：
--
发表时间：
2010-06
期刊：
--
影响因子：
--
作者：
C. Schaefer;C. Heer;M. Ludwig
通讯作者：
C. Schaefer;C. Heer;M. Ludwig
DOI：
10.1109/tgrs.2013.2263934
发表时间：
2014-05-01
影响因子：
8.2
作者：
Krieger, Gerhard
通讯作者：
Krieger, Gerhard
DOI：
--
发表时间：
2010-06
期刊：
--
影响因子：
--
作者：
G. Krieger;M. Younis;N. Gebert;S. Huber;F. Bordoni;A. Patyuchenko;A. Moreira
通讯作者：
G. Krieger;M. Younis;N. Gebert;S. Huber;F. Bordoni;A. Patyuchenko;A. Moreira