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Use capability the sequential probability ratio test for radar detection is consider. Necessary conditions for comparison Neiman-Pierson criterion and sequential probability ratio test are given.

Principles of construction of program modelling complex of the radar-tracking signals reflected from objects of various classes are considered. The developed complex of modelling allows to form casual realizations of a signal reflected from observable object taking into account its sizes and design features, spatial moving of the purpose, presence of rotating reflectors and characteristics of radiation of a radar.

Set of conditional probabilities of accepted decisions and average duration of classification procedure it is offered to characterize functioning quality of the sequential recognition device. The analytical calculation technique of quality indicators is developed. The technique basis is made by representation of interchannel differences multidimensional density of probabilities by the truncated number on orthogonal polynoms with optimum picked up weight function. At calculations the hypothesis about supervision continuation is considered to means of a numerical method of Monte-Carlo. Within preset values of the relation a signal-noise qualities demanded indicators are received. The received results have been confirmed by a method of statistical modelling.

A method for estimating and accounting for the statistical distributions of angels for the spatial orientation of an aircraft in the interest of adapting radar systems to changing observation conditions is considered. The influence of the object observation condition on the distribution parameters of the angles of its orientation is analyzed by the method of mathematical modeling. Estimates of the analyzed distribution laws were formed by two methods: the method of statistical test and the Monte-Carlo method. The advantages and disadvantages of each method are considered. The obtained estimates of current distributions of object orientation angles allow adapting radar portraits to changing observation conditions.

The article is devoted to the increasing of the spatial orientation angles estimation accuracy of the aircraft with reference to radar systems. The structural device scheme of the spatial orientation angles estimation of the radar observation object was worked out. Using the method of mathematical modeling there was examined the errors measuring spherical coordinates object influencing to its spatial orientation angles estimation. It is shown that the using of filtered rectangular coordinates meanings of the aircraft allows increasing its spatial orientation angles estimation accuracy. The advantages and disadvantages of the aircraft spatial orientation angles estimation by the proposed method are shown in the interests of radar profiles adaptation to the observation conditions.

An influence of the observation angle on quality of the decisions about class object in solving the problem for radar recognition is considered. The program «Back Skattering Simulation» helped to receive radar range profile and radar spectral profile. The conditional probabilities of decisions were used as quality indicators of radar recognition.

An important aspect of creation of effective recognition systems is the adaptation of radiolocation portraits to the corners of the spatial orientation of the observed object. The modeling complex for estimation of efficiency of the recognition system has been developed. Using mathematical modeling, it is shown that the utilization of adaptive range-finding radiolocation portraits of the object of observation on the basis of the most plausible estimates of its angles of spatial orientation increases of the efficiency of recognition. It is noted that in the conditions of limit of time for making decision about the class of an object, the methods of adaptation must be improved.