Design and development of inter-satellite separation mechanism for Twin Nano satellite — STUDSAT-2
This paper describes the detailed design, development and dynamic analysis of Separation Mechanism for Twin Nano-satellite “STUDSAT-2”. The separation mechanism system is interfaced between the two nano-satellites, STUDSAT-2A and STUDSAT-2B. After the ejection from the PSLV (Polar Satellite Launch Vehicle), due to stability constraints, the satellite is required to remain composite for an estimated period of 3 orbits before separation. Developing a reliable separation mechanism to sustain the launch vehicle vibrations and the space environment is of highest importance. Different design approaches and actuation strategies have been examined to ensure a uniform separation with least disturbance due to mechanically constrained surfaces. The analytical calculation to achieve the required relative velocity of the two satellite with respect to center of mass of the composite structure is performed and same has been validated using ANSYS rigid dynamics tool. Furthermore, the tool is also used to validate structural rigidity.
Printed UHF antenna for satellite communication
In our contemporary world satellite technology is one of the biggest invention for human being. There are thousands of satellite orbiting in the space now-a-days. Most of them are commercial satellite which have a large operational goal. But in recent years a new type of satellite is getting popular which is known as nano satellite or cube satellite. The reason behind this type of satellite is getting admired because it is cost efficient, light weight and focused in limited mission goal. Large satellite has different types of mission goal in one single satellite. But now multiple mission goals are being cut down in small goals and for achieving those small goals nano satellites are the perfect choice. For the nano satellite operation communication through the antenna is one of the major issue for successful mission. In this following research paper we have proposed a microstrip patch antenna with UHF band for nano satellite operations. For miniaturization of antenna in mm unit coaxial probe has been used. Experiment with different types of patch width, ground, feed point gives our design perfection. By comparing our design with pervious related works we get to know about the uniqueness of our design.
Satellite and satellite subsystems reliability: Statistical data analysis and modeling
Reliability has long been recognized as a critical attribute for space systems. Unfortunately, limited on-orbit failure data and statistical analyses of satellite reliability exist in the literature. To fill this gap, we recently conducted a nonparametric analysis of satellite reliability for 1584 Earth-orbiting satellites launched between January 1990 and October 2008. In this paper, we extend our statistical analysis of satellite reliability and investigate satellite subsystems reliability. Because our dataset is censored, we make extensive use of the Kaplanâ€“Meier estimator for calculating the reliability functions. We derive confidence intervals for the nonparametric reliability results for each subsystem and conduct parametric fits with Weibull distributions using the maximum likelihood estimation (MLE) approach. We finally conduct a comparative analysis of subsystems failure, identifying the â€œculprit subsystemsâ€ that drive satellite unreliability. The results here presented should prove particularly useful to the space industry for example in redesigning subsystem test and screening programs, or providing an empirical basis for redundancy allocation.