CubeSat Components and Systems: What India's Space Startups Need to Know
India's commercial space sector has undergone a structural transformation. IN-SPACe licensing, ISRO's technology transfer programs, and dedicated launch vehicles for small satellites have created a viable pathway for startups and research organisations to build and launch CubeSats. The question is no longer "can we do this?" but "how do we do this efficiently, with manageable risk, on a realistic budget?"
Component and subsystem selection is where most CubeSat projects run into avoidable problems. COTS (Commercial Off-The-Shelf) space-grade components have improved dramatically in capability and availability, but navigating export controls, qualification requirements, and integration considerations requires specific knowledge.
The CubeSat Standard and Form Factors
The CubeSat standard (1U = 10x10x10 cm, 1.33 kg maximum) was developed to standardise interfaces and enable rideshare launches. Common form factors: 1U (basic technology demonstrations), 3U (most common for scientific and Earth observation missions), 6U (increased payload capacity, gaining adoption for commercial imaging), and 12U (approaching microsatellite capability with CubeSat integration economics). Form factor selection is driven by payload requirements: the mass and volume of the primary mission instrument: with the satellite bus sized around it.
Critical Subsystems and Supplier Landscape
EPS (Electrical Power System): Solar panels and battery selection determine available power budget for all other subsystems. GaAs triple-junction solar cells provide 28-30% efficiency; Si cells at 15-17% are cheaper. Battery chemistry has shifted to Li-ion (NCA or NMC) for better energy density. EPS vendors include GomSpace, ClydeSpace (Bradford), and Endurosat: all with established export channels to India.
OBC (On-Board Computer): The OBC runs flight software, manages subsystem interfaces, and handles fault detection and recovery. Radiation tolerance is the critical specification: COTS components rated for total ionising dose (TID) of 20-50 krad are appropriate for LEO missions below 600 km altitude. Higher orbits require radiation-hardened processors.
ADCS (Attitude Determination and Control): Pointing accuracy requirements drive ADCS selection. Magnetorquers alone provide coarse attitude control (5-10 degree accuracy). Reaction wheels combined with magnetorquers achieve 0.1-1 degree accuracy. Star trackers combined with reaction wheels enable sub-0.01 degree accuracy for imaging payloads.
Communications: UHF/VHF for TT&C (telemetry, tracking, and command) is standard for most CubeSats: ground station infrastructure is widely available. S-band adds higher-rate downlink for data-intensive payloads. X-band (8-12 GHz) is used for high-resolution imaging downlink but requires more power and more complex antennas.
Export Control Considerations for Indian Organisations
Many space-grade components are subject to export controls: US ITAR (International Traffic in Arms Regulations) and EAR (Export Administration Regulations), and EU dual-use regulations. Indian organisations must confirm export licence requirements before selecting components from US or EU suppliers. Components with ITAR classification require a DSP-5 export licence from the US State Department: a process that can take 3-6 months and adds procurement lead time.
The practical implication: build the export licence application timeline into the project schedule from day one, and evaluate alternative suppliers from non-ITAR jurisdictions (Japan, South Korea, some European suppliers under EAR99) for non-critical components where available. Haflinger Technologies' space systems team has experience navigating this procurement landscape for Indian organisations.
Integration and Testing
CubeSat integration requires clean room access (ISO class 7 or better), ESD-controlled assembly environments, and access to environmental test facilities: thermal vacuum (TVAC), vibration, and EMC. India's ISRO, IITs, and commercial facilities (including SITAR at Bengaluru) provide access to these capabilities. Planning test access and scheduling early in the project timeline is essential: test facility slots are limited and in high demand.