Monopulse DOA estimation of two unresolved Rayleigh targets

This paper provides for new approaches to the processing of unresolved meas urements as two direction-of-arrival (DOA) measurements for tracking closel y spaced targets rather than the conventional single DOA measurement of the centroid, The measurements of the two-closely spaced targets are merged wh en the target echoes are not resolved in angle, range, or radial velocity ( i.e, Doppler processing). The conditional Cramer Rao lower bound (CRLB) is developed for the DOA estimation of two unresolved Rayleigh targets using a standard monopulse radar, Then the modified CRLB is used to give insight i nto the foresight pointing for monopulse DOA estimation of two unresolved t argets. Monopulse processing is considered for DOA estimation of two unreso lved Rayleigh targets with known or estimated relative radar cross section (RCS), The performance of the DOA estimator is studied via Monte Carlo simu lations and compared with the modified CRLB.