Thermal Subsystem Operational Times Analysis for Ubiquitous Small Satellites Relay in LEO

Abstract

The success of the satellite subsystems engineering depends on the optimal design, modeling, simulation, and validation of the deliverables of the conceptual and mission design objectives. This paper presents the operational times analysis of the thermal control subsystem onboard a 97-kg microsatellite in low-Earth orbit during an eclipse period. Power-storing, communication downlink and uplink, payload processing, and thermal control overpower modes were implemented for a communication mission under worst-case orbital patterns. An embedded digital temperature and lighting controller circuitry was designed and practically validated to effect a desired logic. For an average eclipse period of 34.4 mins, the operational times of the thermal subsystem at altitudes of 400 km, 500 km, and 600 km are 38.6 mins, 38.1 mins, and 37.7 mins respectively. Moreover, the thermal control subsystem simulation reveals that reducing the operational times of non-thermal control subsystems during the eclipse period by 50 % can result in an operational factor of safety of over 1.5. At least 10 dB data link transmission margin can be achieved. The reported findings show that the operational times of spacecraft subsystems overpower modes can be reconfigured in orbit to reliably sustain the operating conditions of the capability-based satellite components for ubiquitous communication.

8-12 GHz pHEMT MMIC Low-Noise Amplifier for 5G and Fiber-Integrated Satellite Applications

“…characteristics of the pHEMT the transistor, dc and RF different bias conditions are semiconductor pHEMT V characteristics are performed the operating point for the the power consumpt V characteristics for a 2 International Review of Aerospace Engineering, Vol. 13, N. 3 The pertinent design, modeling and simulation results are presented in Section IV. Section V concludes the…”

“…The 5G RAT implementation across the niche wireless communication and vertical industries/sectors is constrained by the availability of reliable physical layer devices such as the Monolithic Microwave Integrated Circuit (MMIC) Low Noise Amplifier (LNA). Integrated earth-space heterogeneous communication infrastructure requires adaptive space assets [2], [3] and advanced radio access technologies ecosystem (such as 5G). Integrated 5Gsatellite systems are required to deliver space-enabled reliable transmission [3] of ultra-low latency [4], [5], massive machine-to-machine (M2M) and broadband This paper examines the relationship between the mm wave receiver sensitivity and the noise floor over the X band for Architecture Fig.…”

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“…Data communication reliability is a to the stochastic nature of the channel. Consequently, the space and the terrestrial environments are different and both [3]. proposed reconfigurable ubiquitous seamless analysis of the satellite link performance s revolve shold; noise power of the band frequency is for space research, deep space operations, and tion satellites over the merged transceiverannels.…”