The Angle-Measuring Algorithm for the Stepped-frequecy Radar Based on Dual-line Digital Phase Interferometer

The phase interferometer is very important in the direction-finding and position of target. In this paper, the phase interferometer is employed to angle measurement of the stepped frequency radar target. By the way of dual-line digital phase interferometer, the contradiction between direction range and direction accuracy is solved. The effect of SNR and AOA on the accuracy of angle measurement is also analyzed. In order to remove the errors of amplitude and phase which is introduced by the antenna element, cable and receiver, an error correction method is presented. The algorithm of angle measurement and the method of removing errors of amplitude and phase are verified by the experiment.