The article analyzes the impact of restrictions on the effectiveness of space-time processing techniques in the antenna array during the implementation of space-time access methods. The method of qualitative and quantitative assessing the impact of the sum of the destabilizing factors in the form of restrictions affecting the signal to interference + noise ratio (SINR) is proposed on the basis of calculating the spatial coherence factor (SCF), which represents the value of the scalar product of the vectors of the desired signal and interference signal space. The estimation of the upper and lower SINR values has been performed using spatial coherence factor in the assumption that the level of the interference signal interfering an SS at the entrance of AAA is significantly greater than the thermal noise power. The estimate of normalized index SINR reduction has been obtained regarding SCF. The conditions of the SCF influence on the convergence rate of the adaptation process of the AAA control algorithms are shown and the analysis of the SCF boundary values is carried out, as a result of which the basic approaches to the construction of the AAA have been developed.