DocumentCode :
1197882
Title :
Effect of Spectrum on the Measurement of Noise
Author :
Ackerlind, Erik
Volume :
24
Issue :
2
fYear :
1975
fDate :
6/1/1975 12:00:00 AM
Firstpage :
118
Lastpage :
121
Abstract :
A substantial discrepancy was found to exist between the sigma (standard deviation) of the noise present in radar data as determined by subtraction of data smoothed by a low-pass filter from the raw data and use of successive differences to isolate the noise. An investigation revealed that implicit in the equation based on the successive differences approach was the assumption that the noise was white, bandlimited, and with a cutoff frequency equal to the Shannon frequency. Hence, analyses were performed to take into account other situations, namely: band-limited white noise having a cutoff frequency less than the Shannon frequency; white noise modified by an RC filter; and spurious sinusoidal signal present. By taking into account these various types of noise spectra, it was possible to obtain excellent agreement between the two methods for measuring the noise sigmas.
Keywords :
Cutoff frequency; Difference equations; Low pass filters; Noise measurement; Performance analysis; Pollution measurement; Radar measurements; Signal analysis; Spaceborne radar; White noise;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.1975.4314391
Filename :
4314391
Link To Document :
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