Radar Ground-Clutter Shields

Ruze, J.; Sheftman, F. I.; Cahlander, D. A.

doi:10.21236/ad0627465

Cited by 2 publications

(2 citation statements)

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“…volume, a physically constructed reflective shield (CSF) was developed and simulated to be incorporated in the volume model. CSF are used in military applications since the sixties [38,39] and are still commonly used today, for example in earth and space science radars to reduce land clutter [49]. The general idea is to have a fully opaque fence with respect to the utilized wavelength, positioned at a fixed distance to the radar antenna covering an area of several square meters [38].…”

Section: Plos Onementioning

confidence: 99%

“…To optimize the spatial detection volume by minimizing ground clutter, a practical implementation of a physical fence, a so-called clutter shielding fence (CSF), shielding the ground directed radiation is presented. The dimensioning of the CSF is based on laws from physical optics and early military radar shielding studies [38,39]. To incorporate the influence of the CSF in the spatial detection volume model and to analyze its shielding and diffraction characteristics, a simulation model of the CSF was developed and experimentally verified.…”

Section: Introductionmentioning

confidence: 99%

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Analytical volume model for optimized spatial radar bat detection in onshore wind parks

et al. 2020

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To develop mitigation measures for the protection of bats in close proximity to onshore wind turbines, new detection techniques covering large-scale environments and techniques, which are able to track individuals are required. Radar based observations, successfully applied in ornithological studies, offer a promising potential, but come with challenges regarding the comparability of measurements and noise interference (ground clutter) from objects within detection range. This paper presents improvements of a commercially available inexpensive pulse radar for 3D spatial detection of bat-sized objects in onshore wind parks. A new analytical spatial detection volume model is presented incorporating calibrated radar data and landscape parameters such as clutter. Computer simulation programs to process the analytical spatial detection volume model were developed. For model calibration, the minimum signal power of the radar was experimentally determined with the radar cross section (RCS) of an artificial bat (similar to Nyctalus noctula), resulting in a maximum detection range of 800 m and a corresponding RCS of 12.7 cm 2. Additionally, the spatial volume for radar detection was optimized with a clutter shielding fence (CSF). Adjusting the volume model by incorporating a theoretical model of the CSF, an extension of the detection volume by a factor of 2.5 was achieved, while the total volume of a 105˚horizontal angular radar image section yields 0.0105 km 3. Extrapolation and comparison with state-of-the-art acoustic bat detection result in a 270 times larger volume, confirming the large-scale detection capabilities of the pulse radar.

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