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A high-precision phase-derived range and velocity measurement method based on synthetic wideband pulse Doppler radar

基于合成宽带PD雷达的高精度相推测距测速方法

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Abstract

Development of radar technology needs to address the two-dimensional high resolution of range and velocity simultaneously for high-speed targets. Taking advantage of the superior coherent performance of synthetic wideband pulse Doppler radar, this paper elaborates the principles of phase-derived range and velocity measurements. Moreover, this paper explores the key technologies of unwrapping phase ambiguity, and discusses the phase unwrapping strategy at a low signal-to-noise ratio (SNR). The proposed method can be applied to the conditions of low SNR and has comparatively strong practicality in engineering. Both the ejection ball and civil aircraft experiments have validated the correctness and feasibility of the proposed method. In particular, the experimental results reveal that the accuracy of phase-derived range and velocity measurement has reached a level of submillimeter or millimeter and centimeter/second or submillimeter/second, respectively.

摘要

创新点

雷达技术发展需要解决高速目标如何同时实现距离和速度二维高分辨的问题。本文基于合成宽带脉冲多普勒(PD)雷达良好的相参性能,阐述了高精度相推测距测速实现原理,并对相位解模糊关键技术进行了研究,探讨了低信噪比条件下的相位解模糊策略。本文所提方法能够大幅降低相推测距对信噪比的要求,具有较强的工程实用性。弹射钢球实验和民航飞机实验验证了该方法的正确性和可行性,其中相推测距精度达到了亚mm或mm量级,相推测速精度达到了cm/s或亚m/s量级。

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Acknowledgments

This work was supported by 111 Project of China (Grant No. B14010) and National Natural Science Foundation of China (Grant No. 61301189).

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Correspondence to Lixiang Ren.

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Fan, H., Ren, L., Long, T. et al. A high-precision phase-derived range and velocity measurement method based on synthetic wideband pulse Doppler radar. Sci. China Inf. Sci. 60, 082301 (2017). https://doi.org/10.1007/s11432-016-0097-4

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Keywords

  • synthetic wideband PD radar
  • phase-derived range measurement
  • phase-derived velocity measurement
  • unwrapping phase ambiguity
  • track filtering
  • minimum entropy method

关键词

  • 合成宽带PD雷达
  • 相推测距
  • 相推测速
  • 解相位模糊
  • 航迹滤波
  • 最小熵方法