Backscatter and Doppler Filters for the Project Music Radar

Abstract

The storage, crosscorrelation radar developed under Project Music uses several t y p e s of passive filters which serve diverse purposes in the equipment chain preceding the data-analysis sections. Laboratory-developed filters were em,)yed, as well as a commercially available type. Problems to which these filters were applied included, primarily, the elimination of interference by large-area s i g n a Ireturn or backscatter, separation and limitation of the desired doppler frequencies, sideband elimination, and the removalof 60-cycle modulation from the received signal. The filter units Incorporated into the Music system have given reliable service in the more than three years they have been in operation.