Angle Measurement Accuracy Analysis of Sum-difference Monopulse Radar

The angle measurement is one of the fundamental functions of modern radar, and the sum-difference monopulse technique is a widely-used angle measurement approach in the radar. Taking the uniform linear array as an example, this paper firstly derives the sum beam, difference beam and their ratio. Assuming the noise obeys the Gaussian distribution with zero mean, this paper then derives the computation formula of potential measurement precision of sum-difference monopulse technique, which points out that the highest precision is obtained when the target locates at the sum beam direction, and when the target goes away the sum beam direction, the signal-to-noise ratio decreases, and the measurement error becomes large. Finally the simulation experiments are performed and the above conclusions are demonstrated, and the obtained conclusions are of reference meaning for the practical engineering.