Abstract
Undesired echo from a flying object (aerial clutter) significantly contaminates the received signal of a wind profiler radar (WPR) because it has high intensity and spreads over a wide Doppler velocity range. In this study, results of aerial clutter mitigation obtained by applying adaptive clutter suppression (ACS) to a 1.3-GHz WPR are shown. The 1.3-GHz WPR used in this study has a main antenna comprising 13 antenna subarrays (MSAs). five-element Yagi-Uda antennas were also used as antenna subarrays for detecting clutters from low elevation angles (CSAs). The CSAs were used only in reception and installed so that they covered most of the horizontal directions and the horizontal and vertical polarizations. The directionally constrained minimization of power (DCMP) method was used as the adaptive signal processing to mitigate clutter. By the DCMP method, the weighted sum of the signals collected by 13 MSAs and 11 CSAs was computed so that the power of output signals was minimized under the constraint of constant gain in the antenna beam direction. Results of a case study for an aerial clutter from a low elevation angle at 17:04:37 on October 1 2020 showed that an overlap of the aerial clutter over a desired echo (i.e., clear-air echo) was solved by decreasing the aerial clutter whose peak intensity was ~24 dB greater than that of the clear-air echo. In a case study at 09:30:27 on September 18 2020, effects of the DCMP method on the processed results were discussed.
Highlights
Undesired echo from a flying object significantly contaminates the received signal of a wind profiler radar (WPR) because it has high intensity and spreads over a wide Doppler velocity range
The inhomogeneity of the wind field in or among the sampling volumes of the antenna beams is a factor that can negatively affect the product accuracy. Effects of these factors depend on the hardware performance of WPR and atmospheric conditions
SAs is computed so that clutter contamination from the side lobe of the reception antenna is mitigated with a constraint that loss of information on the clear-air echo, which is detected by the main lobe of the main antenna, is reduced [15] [16] [17] [19] [18] [20] [21] [22]
Summary
A wind profiler radar (hereafter WPR), referred to as a radar wind profiler, is an instrument that measures height profiles of wind velocity in the clear air. The inhomogeneity of the wind field in or among the sampling volumes of the antenna beams is a factor that can negatively affect the product accuracy Effects of these factors depend on the hardware performance of WPR and atmospheric conditions. In ACS, the weighted sum of the signals collected by SAs is computed so that clutter contamination from the side lobe of the reception antenna is mitigated with a constraint that loss of information on the clear-air echo, which is detected by the main lobe of the main antenna, is reduced [15] [16] [17] [19] [18] [20] [21] [22].
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