The monopulse difference chart

Like the "Smith" or Reflection Chart for transmission-line analysis, the "Difference-Signal Chart", or simply "Difference Chart", has been developed for monopulse-radar analysis. This chart provides a coordinate system to graph the difference signal as a complex vector (or phasor) locus for all antenna pattern angles. The graph, when combined with simple construction techniques, offers a visual presentation of the factors affecting the boresight and error signal output of a monopulse tracking radar. It enables a quantitative analysis of performance by inspection and also helps to develop concepts which lead to a better understanding of monopulse operation.