Abstract
Traditional constant false alarm rate (CFAR) methods have shown their potential for foreign object debris (FOD) indication. However, the performance of these methods would deteriorate under the complex clutter background in airport scenes. This paper presents a threshold-improved approach based on the cell-averaging clutter-map (CA-CM-) CFAR and tests it on a millimeter-wave (MMW) radar system. Clutter cases are first classified with variability indexes (VIs). In homogeneous background, the threshold is calculated by the student-t-distributed test statistic; under the discontinuous clutter conditions, the threshold is modified according to current VI conditions, in order to address the performance decrease caused by extended clutter edges. Experimental results verify that the chosen targets can be indicated by the t-distributed threshold in homogeneous background. Moreover, effective detection of the obscured targets could also be achieved with significant detectability improvement at extended clutter edges.
Highlights
According to MOOG Aircraft Group, one of the biggest airplane component-makers in the world, over 66% of airport emergencies are related to foreign object debris (FOD) on runways [1]
In2 and 3, three 1, and four targets involvedon respectively, some are masked near edges.2 and Experiment two objects areare considered the homogeneous background
3, three and four targets are involved respectively, some are masked near the clutter edges
Summary
According to MOOG Aircraft Group, one of the biggest airplane component-makers in the world, over 66% of airport emergencies are related to foreign object debris (FOD) on runways [1]. Existing systems (such as Tarsier [1], operating in 94.5GHz) have shown that microwave radars can provide high resolutions to defense metal, stones, concrete, or even plastics with small radar cross-section (RCS) on runways and air operations area (AOA) surfaces [3] Some other high-resolution radars have been successively developed and testified by simulations and outfield experiments, operating around wide-range single frequencies (e.g., 76.5 GHz [4], GHz [5,6], GHz [7], and 96 GHz [2]). [8], a multi-frequency study was presented, focusing both on the comparative measurement of asphalt clutter and on the RCS of typical FOD targets across a wide spectral band [8] In Ref. [8], a multi-frequency study was presented, focusing both on the comparative measurement of asphalt clutter and on the RCS of typical FOD targets across a wide spectral band [8]
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