Beam-waveguide-antenna monopulse radar amplitude-phase inconsistency satellite calibration method

Accurate calibration of amplitude and phase inconsistency is a necessary condition for radar system to track the measurement target accurately. In radar system, the amplitude-phase inconsistency of receiver's sum and difference channels will lead to the decrease of sensitivity of angle measurement, the decrease of angle measurement accuracy which will eventually lead to the instability of target tracking or even the failure to track the target. The traditional calibration methods of radar system mainly include tower calibration and standard balloon calibration, in which tower calibration is difficult to meet the far-field conditions, and both of them are susceptible to external environment.For the beam waveguide(BWG) antenna system, the Coordinates Conversion between the angular error coordinates of feed and the angular error coordinates of antenna should be considered in the process of moving targets tracking.Satellite calibration meets the requirements of far-field conditions and all-day, all-weather work. In this paper, a calibration method based on satellite calibration for amplitude-phase inconsistency of beam waveguide antenna pulse measurement radar is proposed. The method uses joint estimation of elevation and cross-elevation channels, which has high calibration accuracy, strong applicability and is easy to implement in engineering. The simulation and outfield test results verify the effectiveness of the proposed method.