Inventors:
Eugene L. Roberts - Maitland FL
Thomas J. Steffancin - Orlando FL
Assignee:
The United States of America as represented by the Secretary of the Army - Washington DC
International Classification:
H04B 700
Abstract:
A system employing broadband radio frequency vector multipliers in a balang process for nulling out unwanted radio frequency signals. The nulling is achieved by adjustment of both the desired and interference signals as they pass through the system. The adjustment is accomplished by using vector multipliers which shift the phase by equal amounts and vary the amplitude by proportionate amounts of one or more radio frequency signals in response to separate phase shift and amplitude control forces. To obtain a desired phase shift, an incoming radio frequency signal is split into 0. degree. and 90. degree. components. By multiplying the 0. degree. component by the cosine of the desired phase shift angle, multiplying the 90. degree. component by the sine of the desired phase shift angle, and then summing the results, the signal can be phase shifted by any amounts through all four quadrants. The phase shift and amplitude control forces may be operator initiated or may be initiated through control processing to maximize the relative strength of the desired signal with respect to the interference signal.