Estimating the DOA mean and variance of off-boresight targets using monopulse radar

In monopulse radars, the direction of arrival (DOA) is estimated by the in-phase part of the monopulse ratio. The monopulse ratio curve (MRC) is highly nonlinear and hence, when the DOA variance is mapped through the MRC to estimate the off-boresight angular displacement, the variance of the angle estimator is often too small. Conventionally, the off-boresight angle parameters (mean and variance) are calculated by assuming the curve to be linear at the DOA estimate. This paper analyses the conventional method and investigates new methods for more accurate mapping of the DOA mean and variance to estimate off-boresight angle parameters