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Sensors 2016, 16(7), 1055; doi:10.3390/s16071055

Automatic Censoring CFAR Detector Based on Ordered Data Difference for Low-Flying Helicopter Safety

School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 29 April 2016 / Revised: 22 June 2016 / Accepted: 5 July 2016 / Published: 8 July 2016
(This article belongs to the Section Remote Sensors)

Abstract

Being equipped with a millimeter-wave radar allows a low-flying helicopter to sense the surroundings in real time, which significantly increases its safety. However, nonhomogeneous clutter environments, such as a multiple target situation and a clutter edge environment, can dramatically affect the radar signal detection performance. In order to improve the radar signal detection performance in nonhomogeneous clutter environments, this paper proposes a new automatic censored cell averaging CFAR detector. The proposed CFAR detector does not require any prior information about the background environment and uses the hypothesis test of the first-order difference (FOD) result of ordered data to reject the unwanted samples in the reference window. After censoring the unwanted ranked cells, the remaining samples are combined to form an estimate of the background power level, thus getting better radar signal detection performance. The simulation results show that the FOD-CFAR detector provides low loss CFAR performance in a homogeneous environment and also performs robustly in nonhomogeneous environments. Furthermore, the measured results of a low-flying helicopter validate the basic performance of the proposed method. View Full-Text
Keywords: low-flying helicopter safety; nonhomogeneous clutter environment; constant false alarm rate (CFAR); first order difference (FOD) low-flying helicopter safety; nonhomogeneous clutter environment; constant false alarm rate (CFAR); first order difference (FOD)
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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MDPI and ACS Style

Jiang, W.; Huang, Y.; Yang, J. Automatic Censoring CFAR Detector Based on Ordered Data Difference for Low-Flying Helicopter Safety. Sensors 2016, 16, 1055.

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