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Clutter map CFAR detector based on maximal resolution cell

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Abstract

In order to improve the detection performance of clutter map constant false alarm rate (CFAR) detectors in multiple persisting targets situation, a clutter map CFAR (CM-CFAR) detector based on the maximal resolution cell (CM/MRC-CFAR) is proposed in this paper. In the CM/MRC-CFAR detector, at each scan, a comparison threshold is computed by multiplying the amplitude of the maximal resolution cell (MRC) in the map cell by a scaling factor. Then, the number of the left resolution cells, whose amplitudes are smaller than the comparison threshold, is counted and compared with a threshold integer. Based on the comparison result, proper resolution cells are selected to update the detection threshold. The detection probability of CM/MRC-CFAR in both homogeneous and multiple persisting targets situations is derived in a closed-form expression. The detection performance of CM/MRC-CFAR is evaluated in various environments and compared with other CM-CFAR detectors. CM/MRC-CFAR exhibits a very low CFAR loss in a homogeneous environment and achieves a robust detection performance in multiple persisting targets situations. Since no ranking is required except searching for the MRC, the computation load of CM/MRC-CFAR is low, and it is easy to implement the detector in radar systems in practice.

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Acknowledgments

This work was supported in part by the National Natural Science Foundation of China under grant 11273017.

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Authors and Affiliations

  1. Department of Communication Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Ren-li Zhang, Wei-xing Sheng, Xiao-feng Ma & Yu-bing Han

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  1. Ren-li Zhang
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  2. Wei-xing Sheng
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  3. Xiao-feng Ma
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  4. Yu-bing Han
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Correspondence to Ren-li Zhang.

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Zhang, Rl., Sheng, Wx., Ma, Xf. et al. Clutter map CFAR detector based on maximal resolution cell. SIViP 9, 1151–1162 (2015). https://doi.org/10.1007/s11760-013-0544-0

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  • DOI: https://doi.org/10.1007/s11760-013-0544-0

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