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Sensors 2018, 18(7), 2241; https://doi.org/10.3390/s18072241

Radar Detection of Fluctuating Targets under Heavy-Tailed Clutter Using Track-Before-Detect

1,2,* , 1
and
1,2
1
Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 25 June 2018 / Accepted: 5 July 2018 / Published: 12 July 2018
(This article belongs to the Section Remote Sensors)
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Abstract

This paper considers the detection of fluctuating targets in heavy-tailed clutter through the use of dynamic programming based on track-before-detect (DP–TBD) in radar systems. The clutter is modeled in terms of K-distribution, which can be widely used to describe non-Gaussian clutter received from high-resolution radars and radars working at small grazing angles. Swerling type 1 is considered to describe the target fluctuation between scans. Conventional TBD techniques suffer from significant performance loss in heavy-tailed environments due to the more frequent occurrences of target-like outliers. In this paper, we resort to a DP–TBD algorithm based on prior information, which can enhance the detection performance by using the environment and target fluctuating information during the integration process of TBD. Under non-Gaussian background, the expressions of the likelihood ratio merit function for Swerling type 1 targets are derived first. However, the closed-form of the merit function is difficult to obtain. In order to reduce the complexity of evaluating the merit function and the computational load, an efficient approximation method as well as a two-stage detection approach is proposed and used in the integration process. Finally, several numerical simulations of the new strategy and the comparisons are presented to verify that the proposed algorithm can improve the detection performance, especially for fluctuating targets in heavy-tailed clutter. View Full-Text
Keywords: target detection; radar systems; K-distributed clutter; heavy-tailed; Swerling target; track-before-detect (TBD) target detection; radar systems; K-distributed clutter; heavy-tailed; Swerling target; track-before-detect (TBD)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gao, J.; Du, J.; Wang, W. Radar Detection of Fluctuating Targets under Heavy-Tailed Clutter Using Track-Before-Detect. Sensors 2018, 18, 2241.

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