1. A method for reducing the false alarm rate produced by the number of alarms of fixed targets erroneously declared as moving targets in the radar images of two- or multi-channel MTI radar devices, comprising the steps of: providing and using a space time adaptive processing filter in a visible side antenna lobe in the radar image for the suppression of fixed targets in the side antenna lobe, comparing amplitude amounts or power values of range Doppler frequency cells with a threshold specified in constant terms and summing of resulting alarms from said comparison, wherein only those alarms whose amplitude amounts or power values are above the specified threshold are used and combined into clusters, wherein first a summary of alarms that is directed in a direction of the Doppler frequency into Doppler frequency clusters occurs based on their minimal distance to each other and subsequently a summary of Doppler frequency clusters that is directed in a distance direction into range Doppler frequency clusters occurs based on their minimal distance to each other, comparing a target function with a test function, wherein the test function is an intersecting function of a two-dimensional characteristic function of the amplitude and phase progressions of a main antenna lobe as a function of the Doppler frequency and the target function is a characteristic function, calculated for each alarm, of the amplitude and phase progressions of a respective target as a function of the Doppler frequency on the Doppler frequency position of the respective target, and determining selection criteria from suitable combined calculation methods that are applied to the test and target functions for the purpose of classifying a respective target alarm as a moving or fixed target alarm.