On the feasibility of using measured sea clutter continuum in HFSWR to validate modelled ground-wave propagation attenuation in rough sea

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Authors
  1. Leong, H.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
This report presents the results of an investigation on the feasibility of using the sea clutter continuum between the Bragg lines of monostatic HF Surface Wave Radar (HFSWR) to validate the ground-wave propagation attenuation model for rough sea, based on Barrick’s formulation. The proposed validation is based on a comparison between the measured and modelled sea clutter levels from a variety of sea states over a range interval approximately between 63 and 200 km. The sea state in the interval was roughly indicated by the significant wave height measured at the far side of the radar coverage. The measured sea clutter is estimated from the median of the averaged power levels between the Bragg lines over a selected number of radar dwells in a moving window. The modelled sea clutter attenuation is then obtained by calibrating the modelled ground-wave propagation attenuation to the median sea clutter from a selected range bin in the near side of the chosen interval. The steadiness of the sea state in the selected range bin was closely monitored by the variation of the median from that range. If this median is deemed to be steady over the duration of the moving window, then the radar data segment is chosen for the investigation. The results show that the measured and modelled sea clutter attenuations agree well over the chosen interval in four different sea states at two radar frequencies. The validation is also compared with that using a dedicated ship target. It is found that

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Report Number
DRDC-OTTAWA-TR-2012-015 — Technical Report
Date of publication
01 Sep 2012
Number of Pages
74
DSTKIM No
CA036801
CANDIS No
536461
Format(s):
Electronic Document(PDF)

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