Direction Finding Accuracy for Ropucha-Class Landing Ship in Sighting along Missile Flight Trajectory

the method that allows to calculate the direction finding errors for radar objects with complex shape is proposed for case that direction-finder is placed in near zone of scatterer with huge electric sizes. It is shown that main reason for errors is amplitude-phase field distribution distortions in aperture of received antenna. For all that the angle distortions increase with reducing distance to object and can be significant. At the modern stage the radar equipment development is defined by general direction to increase accuracy of object parameters determination. In the case when object dimensions are bigger than sounding signal wavelength it is possibility to account the spatial greatness of complex shape real radar targets: aircrafts, ships, cars. Thus for series of radar problem it is necessary to have a priopi information about behavior of scattered electromagnetic field in the near zone of such objects.