METHOD FOR MEASURING ENERGY SPECTRUM OF NARROWBAND SPACE RADIO-FREQUENCY RADIATION Russian patent published in 2008 - IPC G01R23/18 

FIELD: electronics.

SUBSTANCE: the method is based on computing realizations of spectrum of output signal of receipt and amplification channel of radio-telescope by means of fast Fourier transform, accumulation and averaging of spectrum realizations. Powers of signal mixture and native noise are compared at channel output with noise power in band of frequencies which is not occupied by signal being researched, and at amplitude calibration by means of noise impulses, which are periodically injected into receipt and amplification channel. Frequency band is expanded in a way to fit a section which does not contain a signal. Spectrum realizations are computed both during injection of calibrating noise impulses and during pauses between them. Spectrum realizations during impulses and without them are averaged separately, and on basis of averaged spectrum realizations, average values of noise powers are computed at frequencies which are free of signal, with injected calibration impulses or without them. On basis of a pair of averaged signal spectrum realizations at output of receipt and amplification channel and a pair of produced average values of noise powers, energy spectrum of signal being researched is computed in antenna. Spectral components of noise temperature of signal being researched are determined as a result of multiplication of half of noise temperature of calibration impulses and ratio between difference of totals of pair of components of averaged spectrums and pair of average values of noise powers and difference of average values of noise powers. To reduce errors, introduced by instability of receiving system parameters, time of observation of radiation source is split onto shorter intervals, in each interval, energy spectrums of signal are computed, and results are averaged.

EFFECT: reduced signal observation time and increased precision of measurements.

3 cl, 1 dwg