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The effect of IMU inaccuracies on airborne SAR imaging

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Journal of Electronics (China)

Abstract

When using motion compensation approaches based on the measurement of motion sensors, the residual uncompensated motion errors due to measurement instrument inaccuracies contribute to phase errors and hence degrade Synthetic Aperture Radar (SAR) images. This paper presents a model to compute the phase error caused by Inertial Measurement Unit (IMU) measurement inaccuracies. By analyzing SAR motion compensation method and the effect of lever arm, this model derives the contribution of each term of IMU inaccuracies towards the residual uncompensated motion errors and provides a method to calculate each order of the residual phase error. According to the model, computed results of the airborne X-band SAR system with POS AV510 accord closely with the actual image quality.

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Microwave Imaging, Institute of Electronics, Chinese Academy of Sciences, Beijing, 100190, China

    Yongfei Mao, Maosheng Xiang & Lideng Wei

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100039, China

    Yongfei Mao

  3. Beijing Aerospace Control Center, Beijing, 100094, China

    Songtao Han

Authors
  1. Yongfei Mao
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  2. Maosheng Xiang
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  3. Lideng Wei
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  4. Songtao Han
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Corresponding author

Correspondence to Yongfei Mao.

Additional information

Supported by the National Basic Research Program (973) of China (No. 2009CB724003) and the National High-Tech Research and Development Program (863) of China (No. 2007AA120302).

Communication author: Mao Yongfei, born in 1983, male, Ph.D. candidate.

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Mao, Y., Xiang, M., Wei, L. et al. The effect of IMU inaccuracies on airborne SAR imaging. J. Electron.(China) 28, 409–418 (2011). https://doi.org/10.1007/s11767-012-0617-1

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  • DOI: https://doi.org/10.1007/s11767-012-0617-1

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