When developing the radar systems with high information content, it is advisable to use the polarization-modulated signals (PMS). This provides: the maximum amount of information about the polarization characteristics (PC) of the radar objects (RO), the possibility of affective polarization selection (PS) objects in the background of interfering reflections (IR), absorbing coatings and electronic jamming, the use of the total effective surface (TES) of the object, which is especially important in the detection polarization characteristics of the radar, the possibility of extracting information about the shape recognition, an increase of noise immunity of radiolocation stations, the polarized averaged angular noise extended RO, reducing system cost compared to expensive systems of the formation of the portrait targets with ultrashort pulses or multifrequency signals. The relationship of information content of the parameters of the polarization-modulated signals PMS with the sufficient information on the basis of the experimental data processing has been determined. The technique for estimation of the information content of the polarization characteristics of the given signals, reflected from RO, has been proposed. Based on the experimental data processing it has been explained that already two-dimensional polarization features deliver the information amount in excess of the sufficient one. As a result, it has been found that the least informative polarization characteristics are the structural ones, connected with the target effective surface. However, some of the structural characteristics can be used to classify RO, for example, the coefficient of correlation between the orthogonal polarized components of the signal. The most informative are the vector of coefficients and the depolarization vector («anisotropy factor», «coefficient of skewness»). The probability of recognition of RO class can be significantly increased in realization of the possibility of accumulation of the polarized information.