Accession Number : ADD011487
Title : Coherent Receiver Phase and Amplitude Alignment Circuit.
Descriptive Note : Patent Application,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Hansen,J P
Report Date : 13 Nov 1984
Pagination or Media Count : 23
Abstract : A device for aligning the phase and amplitude of a quadrature-detected coherent two-channel receiver utilizing a mixer in each channel comprising a circuit for providing a sweep frequency signal to each receiver channel; a circuit for detecting the envelopes of the receiver channels at the outputs of the mixers and determining the voltage difference between the envelopes; and a circuit for controlling the amplitude level in one of the receiver channels in accordance with this voltage difference. Simultaneously, the output signals from the two mixers are added with the resulting sum signal being envelope-detected, and also subtracted from each other with the resulting difference signal being envelope-detected. The sum envelope and the difference envelope are subtracted from each other to generate a control signal for controlling the phase of one of the mixer local oscillator signals to ensure that the mixer local oscillator signals are in phase quadrature.
Descriptors : *Patent applications, *Receivers, *Mixers(Electronics), Finite difference theory, Sweep frequency techniques, Envelope(Space), Coherence, Orthogonality, Output, Channels, Alignment, Control, Amplitude, Signals, Circuits
Subject Categories : Non-radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE