System and method for compensation of in-phase and quadrature ph

Details System and method for compensation of in-phase and quadrature ph System and method for compensation of in-phase and quadrature ph

1990-12-10

1992-04-14

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Testing or calibrating of radar system

By monitoring

342194, G01S 740

Patent

active

051051958

ABSTRACT:
A system and method for correcting a gain and phase imbalance between I and Q channels of a synchronous detector. The method of the invention includes the steps of: a) inputting a signal into the detector and extracting therefrom a received signal and a corresponding image signal; b) inputting the received signal in a first Doppler filter; c) inputting the image signal in a second Doppler filter; d) forming a first discriminant; e) forming a second discriminant; f) computing phase (.phi.) and gain (.rho.) errors from the first and second discriminants; g) calculating first and second correction factors based on the phase and gain errors; and h) using the correction factors to correct the phase and gain imbalance errors.

REFERENCES:
patent: 3950750 (1976-04-01), Churchill et al.
patent: 4003054 (1977-01-01), Goldstone
patent: 4122448 (1978-10-01), Martin
patent: 4994810 (1991-02-01), Sinsky

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