No abstract

This article presents methods and software tools for modeling and analysis of space system onboard equipment operation. The authors suggest the design of a heterogeneous model uniting knowledge bases and virtual devices simulating work of data reception and transmission equipment. Model design considers tasks appearing during preparation of satellite production at a company-manufacturer of the space industry. The model can be used at the stages of designing and testing of the onboard equipment. For design support, the model allows assessment of parameters of the reception-and-transmission path and of destabilizing factor influence on communication line quality. For ground test support, the model simulates functions of the onboard equipment during command-and-software control of a spacecraft, providing reception and transmission methods for a wide range of commands and methods of generation of telemetry frame values. The comparison of precedents obtained during simulation tests with the results of the finished equipment testing, allows determination of special features of the onboard system operation that can stay unnoticed if other methods of test preparation and analysis are applied.

A lag of CCSDS recommendation is shown. Main part of onboard equipment-Tracking, Telemetry and Command Subsystem is shown as source for potential improvements for new standards. It is possible by increasing of estimation accuracy of the parameters of the orbit of spacecraft.

Abstract-A device for clinical and domestic applications in cardiological studies is described.

The broken rhythm of the heart activity of a person can lead to fatal consequences if it is not detected at an early stage. The article described a device for counting and indicating the number of violations of rhythm of cardiac activity. The device is intended for home use and does not require medical knowledge. If the patient will notice a trend towards the increasing number of arrhythmias, he must seek for cardiology advice.