| 摘要: |
| 为了解决无法同时获取高分辨率和宽测绘带的问题，方位多通道系统应运而生。高分三号的双通道成像模式称为超精细成像模式，用来满足高分宽测的需求。通道间幅相不一致一直是方位多通道系统需要解决的问题。通道误差会导致存在虚假目标，成像质量下降。为了解决通道误差问题，提出一种基于内定标数据的校正方法，首先通过内定标数据估计出通道误差，然后在距离频域对回波数据进行相应的误差补偿。高分三号实测数据的处理结果表明该方法可有效估计出通道误差，抑制方位模糊。可见基于内定标数据的误差校正方法的有效性和鲁棒性。 |
| 关键词: 通道误差 方位多通道 内定标 高分辨率 |
| DOI：DOI:10.3969/j.issn.1672-2337.2019.06.009 |
| 分类号:TN958 |
| 基金项目:国家高分重大专项计划资助项目；国家重点研发计划资助项目(No.2017YFB0502700) |
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| A Channel Error Correction Method for GF 3 SAR Dual Channel Imaging Based on Internal Calibration Data |
|
HOU Bingqian，SONG Hongjun
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1.Institute of Electronics，Chinese Academy of Sciences，Beijing 100190，China;2. University of Chinese Academy of Sciences，Beijing 100049，China
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| Abstract: |
| In order to solve the problem that high resolution and wide swath can’t be obtained at the same time，the azimuth multichannel system came into being. The GF 3 SAR dual channel imaging mode is called ultra fine strip map mode，which is used to meet the need of obtaining high resolution and wide swath (HRWS) imaging simultaneously. The inconsistency of the amplitude and phase between the channels has always been a problem that the azimuth multichannel system needs to solve. The channel error can lead to false targets and poor image quality. In order to solve the problem of channel error，a method based on the internal calibration data is proposed. The channel error is estimated by the internal calibration data，and then the corresponding error compensation is performed on the echo data in the range frequency domain. The processing results of the GF 3 measured data show that the method can effectively estimate the channel error and suppress the azimuth ambiguities. It is concluded that the error correction method based on the internal calibration data is effective and robust. |
| Key words: channel error azimuth multichannel internal calibration high resolution |
