Noise measurements at Cape Race in support of East Coast high frequency surface wave radar

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Authors
  1. Leong, H.W.H.
  2. Dawe, B.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Northern Radar Systems Ltd, St John's NFLD (CAN)
Abstract
In support of the operation of the east coast High-frequency surface wave radar (HFSWR) systems, a continuous measurement of noise and interference data in the frequency band of 3-6 MHz was carried out a Cape Race, Newfoundland between August 1, 1998 and May 10, 2000. A procedure called the "minimum of median" was developed to estimate the noise factors from the measured data. The results of the estimation are presented in this report. This estimation showed that (a) nighttime noise power level could be as much as 24.1 dB above daytime noise level; (b) daytime noise level could be sustained for more than 10 hours during the summer, but only for about 6 hours during the winter. The estimated noise factor was then compared the CCIR noise factor for a quiet site. From this comparison, we found that (a) the daytime noise power level could be as much as 6.08 dB lower than the corresponding CCIR noise level, and (b) the nighttime noise level could be as much as 6.72 dB higher than the corresponding CCIR noise level. The transitions from daytime to nighttime or from nighttime to daytime in the measured and CCIR noise data agreed mostly with each other. One exception was that, in the falls of both 1998 and 1999, the nighttime-to-daytime transition in the measured noise data was about two hours earlier.
Keywords
HFSWR (High Frequency Surface Wave Radar);Interference suppression;Atmospheric noise;HF noise;Diurnal variation;Seasonal variation;CCIR noise model
Report Number
DREO-TR-2000-089 — Technical Memorandum
Date of publication
01 Nov 2000
Number of Pages
39
DSTKIM No
CA010558
CANDIS No
514956
Format(s):
Hardcopy;Document Image stored on Optical Disk

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