TABLE OF CONTENTS Alfonso Farina, Giovanni Golino, and Luca Timmoneri
Modern phased array radars are required to detect, locate, and track targets in the presence of natural and intentional electromagnetic interference. Monopulse [1] is the conventional technique to determine the target angular coordinates. This technique does not properly work in the presence of interference. The intentional interference might impinge on the sidelobes as well as on the main beam of the antenna pattern from certain directions. When there is a directional interference in the main beam, it is necessary to use auxiliary antennas that have high gain in the angular region covered by the radar main beam to form a null in the direction of the interference [2]. Thus, the shapes of the sum and difference monopulse beams will be severely distorted by adaptive processing, and the conventional monopulse technique cannot be applied [3].
This chapter illustrates the application of the MLE technique to determine the target direction-of-arrival (TDOA) in presence of main beam interference (MBI) and the related CRLB angular accuracy. Closed formula for the CRLB of the estimation of TDOA...
