Description: As the analysis of the principles of combat use of modern air attack systems, as well as the experience of local wars and conflicts show overcoming air defense systems is carried out by widespread use of various radio interference and by maneuver of targets. All this greatly complicates the work of equipment anti-aircraft systems. This is especially true in the operation of auto-matic tracking systems for angles and distances. The potential of dynamic stability and fast action is not always sufficient for automatic tracking of maneuverable targets, which leads to the disruption of automatic target tracking. Errors in tracking the targets are also significantly increased. Therefore, when designing systems for automatic target tracking, this factor must be taken into account. It is necessary to develop systems on the digital element base and to optimize the systems, based on the crite-ria of optimization, to choose the parameters of the systems being developed. For this purpose, digital models of the appropriate targeting systems are required. Although the analog systems of automatic range tracking are characterized by simple design, at the same time, they have such disadvantages as relatively low stabilityof parameters, drift of zeros of operational amplifiers, the need for constant regulatory work in the process of operation. In this regard, the digital systems of automatic range tracking differ in the best way. In these systems, the stability of the parameters is high, which allows to stay beyond the influence of the environment. In addition, with the digital implementation of systems of automatic range tracking, operating costs associated with periodic adjusting work are significantly reduced. However, digital signal processing leads to additional, so-called instrumental, system errors associated with the final dimensional grid. To ensure that these additional errors do not violate the normal system operation, it is necessary to select the value of the lower digits of the digital devices in such a way that the instrumental errors are in an order lower than the essentially incorrect errors caused by the effect of antenna, radio receiver device noise, and so on. Proceeding from the above, while forming a digital system of distance measurement, one of the tasks is to choose the value of the lower category of the transformation "code-time delay", in which the instrumental errors of quantization on the level in the converter voltage -code can be neglected in comparison with the fluctuation error of systems of automatic range tracking, which is caused by the effect of internal noise; as well as in choosing the parameters of the algorithm of evaluation and extrapolation of the range, on which none- instrumental errors of the system of automatic range tracking depend.
Keywords: promising, digital distance tracking system, digital element base, delay synthesizer, extrapolator, time discrimi- nator