Noise Measurements at Cape Race in Support of East Coast High Frequency Surface Wave Radar

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 at Cape Race, Newfoundland between August 1, 1998 and May 10, 2000. A procedure called the 'm...

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Bibliographic Details
Main Authors: Leong, Hank W., Dawe, Barry
Other Authors: DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
Format: Text
Language:English
Published: 2000
Subjects:
Active & Passive Radar Detection & Equipment
Acoustics
*ACOUSTIC MEASUREMENT
*SEARCH RADAR
HIGH FREQUENCY
OCEAN SURFACE
PERFORMANCE(ENGINEERING)
CANADA
POWER SPECTRA
SEASONAL VARIATIONS
ACOUSTIC DATA
BACKGROUND NOISE
DIURNAL VARIATIONS
NOISE(RADAR)
HFSWR(HIGH FREQUENCY SURFACE WAVE RADAR)
FOREIGN REPORTS
Canada
Newfoundland
Online Access:http://www.dtic.mil/docs/citations/ADA385575
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA385575
Description
Summary: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 at 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; and (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 1. 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. Abstract in French and English.

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