K.V. Kostenko, V.F. Shevtsov

The observed simulation program is applicable for modeling of information signals typical for seismic security systems on discrete sensors. Similar systems find successful application in protection of long perimeters and boundaries, and also in cases when the hidden installation of sensors and precise localization of objects-infringers is necessary. The simulation modeling allows to solve the whole spectrum of problems which includes problems from technical to scientifically -applied character. Signals simulation is applied at debugging of the software complex of the system, both for checking of separate program blocks and to check the entire data processing. Also it appears useful in development and optimization of signals processing logics. The invaluable help in scientifically-applied researches is rendered by the records of signals obtained with the simulator for concrete tactical situations. The simulator basic functions are: Forming of the geometry of system sensors and saving it for further use. Definition of objects trajectories with possibility of their saving for the subsequent making of scenarios. Making on the basis of chosen geometry of the system and objects trajectories the scenario of their movement. Definition of the classification information for each object (the person, group, transport facility) and its individual parameters, and also parameters of the modeled medium. Viewing of the generated signal on each sensor and making of signal records for postprocessing. Generation of signals is performed for each sensor of the system. The signal on the sensor represents the total of the signals energized by the objects, taking into account the distance from each object to the sensor, the relative powers of the objects, and also differences of signal arrival times to the sensor. At signals generation the fading of signals in medium, signal weakening and noise presence are considered. Models of signals created by various classes of the objects are based on the following positions. The signal received from the seismic sensor during the movement of the person has impulse character. Impulse signal main specifications are: pulse duration, on-off time ratio and amplitude of pulses. These parameters depend on specific features of the person, such as speed of his movement, length of steps and weight. The time signal created by the person represents a train of pulses which are created when his feet hits the ground. The group of people represents the object, which moves with definite speed, but each member of the group brings in the individual contribution to the signal. Therefore the signal is being generated for each member of the group, and then summed up taking into account different relative weights and frequency of steps. Thus the amplitude of a signal from a group of people on the average will be higher than from one person, and in spectrum envelope of the signal we will see frequencies higher and lower than frequency of one person. The model of signal originating on sensors during the movement of transport facilities is possible to present as a sequence of accidental collisions of its units with the ground. Therefore the signal on sensors will have the character of uniformly distributed high-level noise. Other typical feature of the signal is presence in its spectrum of powerful discrete components. Their appearance is random in a time and is caused by operating modes of any mechanisms. The given program has found successful application in scientifically-applied researches, in designing, developing and debugging of seismic security systems.