Premium
Signal and Noise Characteristics in Radiometric Correlation Detectors
Author(s) -
Joseph Buck G.
Publication year - 1968
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196834325
Subject(s) - fourier transform , noise power , fractional fourier transform , noise temperature , noise (video) , bandwidth (computing) , noise spectral density , fourier analysis , optics , physics , mathematics , noise figure , telecommunications , computer science , power (physics) , mathematical analysis , phase noise , amplifier , quantum mechanics , artificial intelligence , image (mathematics)
In radio astronomy and other radiometric applications, correlation antenna‐receiver systems are used to measure the Fourier transform of the far‐field temperature distribution. In this paper, the effect of a finite observation bandwidth upon the measurement of the transform is determined. The noise components in the output of the correlator‐antenna system which is observing a distributed source are calculated. The noise power present in the measurement of the real component of the Fourier transform is found to depend on the square of the sum of the integrated temperature distribution and the receiver noise, also upon the square of the real part of the Fourier transform, and the negative of the square of the imaginary part of the Fourier transform. Similar results with appropriate sign changes apply to the imaginary portion of the Fourier transform. The practical restriction on the allowable bandwidth of the correlation receiver is also apparent in these calculations. These values of the signal and noise power can then be used for the optimum processing of the received signal.