Abstract:In the statistical analysis of the random error of the monopulse radar measurement data, it is found that there is a phenomenon of out-of-tolerance in the random error of ranging during the range-avoiding blind period. By analyzing the principle of monopulse ranging and blind range avoidance, and the out-of-tolerance under different range ambiguity, the reasons are as follows: first, the time sequence of blind range avoidance is inconsistent with the normal tracking time sequence, which leads to the calculation error in the random error statistics; second, there is a time deviation with random error when the phase-shifting pulse or phase-shifting gate is generated. A real-time processing method is proposed to eliminate this error, that is, in the process of radar tracking and measurement, the difference between the time difference of the front and rear gates is calculated. The range correction is carried out by combining the target Doppler velocity and the radar PRF cycle, as well as the range ambiguity during blind range avoidance. The experimental results show that this method can effectively improve the ranging accuracy of pulse radar in blind range avoidance.