Measurement of amplitudes and phases of signals at a high speed

Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array

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Details

342192, 342196, H01Q 322, H01Q 324, H01Q 326

Patent

active

059365765

ABSTRACT:
A multi-input amplitude and phase measuring method is disclosed for measuring the amplitudes and the phases of measurement signals at a high speed and with a high degree of reliability. Measurement signals received by antennae are converted into IF signals with local signals of frequencies f.sub.LO +.DELTA.f, f.sub.LO +2.DELTA.f, f.sub.LO +3.DELTA.f, f.sub.LO +4.DELTA.f by a mixer and then added by an adder, whereafter they are multiplied by an analog multiplier to convert phase information of the measurement signals into signals of frequencies .DELTA.f, 2.DELTA.f, 3.DELTA.f, 4.DELTA.f. Then, the signals obtained by the conversion are A/D converted and Fourier transformed to determine a spectrum. Then, in order to eliminate an influence of phase displacement by band-pass filters, the local signals are added by an adder and multiplied by a local signal of frequency f.sub.LO by a mixer, and the resultant signal is A/D converted and Fourier transformed to determine a spectrum. A cross spectrum of the two spectra is calculated by a cross spectrum calculator to measure the amplitudes and the phases of the measurement signals.

REFERENCES:
patent: 5093563 (1992-03-01), Small et al.
patent: 5184134 (1993-02-01), Niho et al.
patent: 5361072 (1994-11-01), Barrick et al.

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