Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Patent
1991-02-15
1992-09-22
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
342194, 342 92, 342102, G01S 740
Patent
active
051501287
ABSTRACT:
A system for detecting phase and gain imbalance errors in a synchronous detector. The synchronous detector (10) is assumed to have a fist circuit (16) for providing a first signal representing a first sinusoidal term (e.g., a cosine term) and for providing a second signal representing a second sinusoidal term (e.g., a sine term) complementary to the first sinusoidal term, circuitry (12) for mixing an input signal with the first signal and circuitry (14) for mixing the input signal with the second signal. The system (16) for detecting phase and gain imbalance errors of the invention includes an amplitude compensation circuit (24) for detecting and correcting amplitude errors in the first and second signals and a phase compensation circuit (26) for detecting and correcting phase errors in the first and second signals. For amplitude compensation, the outputs of the amplitude and phase compensation circuits are input to first and second amplitude detector circuits (28) and (30). The outputs of the first and second amplitude detector circuits (28) and (30) are low pass filtered and subtracted to provide a first feedback signal. The first feedback signal is then used to control the gain of a variable gain amplifier (36) which in turn serves to adjust the gain of one of the sinusoidal signals accordingly. For phase compensation, the outputs of the amplitude and phase compensation circuits (24) and (26) are mixed and filtered to provide a second feedback signal. The second feedback signal is used to adjust the phase shift of a variable phase shifter (38) which in turn serves to adjust the phase shift of the second sinussoidal signal accordingly.
REFERENCES:
patent: 4122448 (1978-10-01), Martin
patent: 4475088 (1984-10-01), Beard
patent: 4584710 (1986-04-01), Hansen
patent: 4612549 (1986-09-01), Geyer, Jr. et al.
patent: 4616229 (1986-10-01), Taylor, Jr.
patent: 4642642 (1987-02-01), Uurtamo
patent: 4833479 (1989-05-01), Carlson
patent: 4876489 (1989-10-01), Cawthorne
patent: 4952940 (1990-08-01), Kuepfer
patent: 4994810 (1991-02-01), Sinsky
Brown C. D.
Denson-Low W. K.
Heald R. M.
Hughes Aircraft Company
Sotomayor John B.
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