Spacecraft Internal Charging Simulation of the Electronics Device Plastic Cases
Abstract—We have simulated an electron bulk charging of the plastic cases of electronic devices as an integral part of the spacecraft internal charging problem. The semiconductor crystal has been placed inside a spherical shell of a polymer dielectric 10^−3–10^−2 m thick having an intrinsic (dark) conductivity in the range from 10^−16 to 10^−9 Ohm
^−1 ·m^−1. The crystal itself is a parallelepiped with sharp edges and vertices which substantially reduce an electrical strength of the case polymer. To assess this effect, we studied the field enhancement at the electrode as a
function of its radius of curvature by measuring the reduction of the breakdown strength of air in a similar onfiguration for electrode radii 2 × 10^−5–10−^ m.
In this paper the assessment of the reliability of radiofrequency cords was carried out. The analysis of mathematical models of the failure rate assessment of components of the radiofrequency cords was submitted and the optimal model, combining incoming components, was deduced. It was concluded that during the calculation of the reliability of the radiofrequency cords, their models must take into account the maximum number of influencing factors in order to produce adequate results.
Electrostatic Discharges, Interferences, Cables, Spacecraft, Onboard Electronics. This paper presents an original test equipment of the electrostatic discharge interferences in a spacecraft cables. Received current transformation into disturb voltage coefficients in the cable sections are used in calculation of interference levels at inputs of a spacecraft onboard radio-electronic equipment.
The review highlights the parameters of multilayer diamond detector for monitoring space radiation based on CVD diamond technique. The paper specifies the results of measuring charge output spectrum of single and double layer diamond detectors. Diamond detector serves to on-board radiation monitoring systems of spacecraft having lifetime increase in up to 20?25 years. The use of a diamond detector multi-layer structure makes it possible to enhance the amplitude of charge output spectrum, to expand the detector dynamic range, as well as to improve the accuracy and information content of radiation monitoring systems.
A review of the literature on internal electrification onboard avionics spacecraft. The influence of space weather on the degree of electrification of the spacecraft. The main responses to the factors affecting the electrification.
The report considers the issues of forecasting the reliability parameters of modern on-board equipment of spacecrafts. The expediency of using the results of tests of equipment and it’s components for resistance to the effects of ionizing radiation to predict the reliability parameters. Substantiated the possibility of alpha-time distribution for the MTBF prediction of reliability and durability of the CMOS integrated circuit. Shown the calculated ratios for estimating the probability of failure-free operation, the mean time between failure and minimum service life. Given possible ways of increasing the life of modern on-board equipment of spacecrafts by using specialized methods of protection against ionizing radiation of space. This study (research grant No 14-05-0038) was supported by The National Research University - Higher School of Economics’ Academic Fund Program in 2014.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.