Facilities

Functional & Performance Testing

Functional and performance testing is conducted to verify that each subsystem and the integrated satellite system conform to all specified technical requirements prior to environmental qualification.

Figure 5.2: INSTED’s Functional & Performance Testing

• Subsystem-level functional verification (Electrical Power System [EPS], On-Board Computer [OBC], Communications [COMM], and Payload) ensures compliance with design specifications and operational protocols.
• End-to-end system functional testing validates the integrated operation of all subsystems under nominal and off-nominal conditions.
• Power cycling and operational mode transition assessments evaluate system resilience and performance across all mission phases.
• Telemetry, telecommand, and fault-handling validation confirm the integrity of spacecraft command and data handling, enabling robust anomaly detection, reporting, and autonomous recovery.

Electrical, EMI, and EMC Testing

This testing protocol is designed to identify and mitigate one of the most prevalent failure mechanisms in CubeSat missions: electromagnetic interference (EMI). EMI and EMC assessments are critical to ensuring the electromagnetic environment of the satellite does not adversely affect subsystem operation or mission success. 

Figure 5.3: KMUTNB’s Electrical, EMI, and EMC Testing

The following technical procedures are implemented:

• Power integrity and load testing: Evaluates the stability of voltage rails, current draw profiles, and susceptibility to transient disturbances across all satellite subsystems.
• Conducted and radiated EMI assessment: Measures emissions and susceptibility at both subsystem and system levels, in accordance with international aerospace EMI/EMC standards (e.g., MIL-STD-461, ECSS-E-ST-20-07C).
• RF coexistence validation (EPS, COMM, OBC): Confirms that power, communication, and control systems can operate simultaneously without interference, using frequency planning, filtering, and shielding techniques.
• Shielded measurement environments: Testing is conducted in electromagnetic compatibility (EMC) chambers or shielded environments to ensure accurate measurement of emissions, susceptibility, and system-level interactions.

Mechanical Testing

Mechanical qualification testing is conducted to ensure the CubeSat’s structural integrity and survivability under simulated launch and deployment conditions. The following standardized procedures are implemented:

• Sinusoidal vibration testing: Characterizes the CubeSat’s structural resonance frequencies and verifies it can withstand steady-state oscillatory loads in accordance with launch vehicle requirements.
• Random vibration testing: Subjects the CubeSat to broadband excitation representative of the stochastic vibration environment experienced during launch, ensuring compliance with specified acceleration and spectral density profiles.
• Multi-axis excitation (X, Y, Z): Applies vibration loads along all three orthogonal axes to validate the CubeSat’s durability and mechanical robustness in three-dimensional space.
• Launch environment simulation: All mechanical testing protocols conform to international deployer-based CubeSat mission requirements (e.g., P-POD, J-SSOD) to guarantee compatibility with standardized launch interfaces and qualification standards.

Currently, INSTED leverages vibration testing facilities at partner institutions with capabilities for precision-controlled excitation and environmental monitoring, ensuring all test data meets the necessary technical documentation and verification standards.

Thermal Vacuum (TVAC) Testing

Thermal vacuum (TVAC) testing is performed to replicate the combined effects of low pressure and temperature fluctuations encountered in low Earth orbit (LEO). This qualification process validates the satellite’s operational stability, thermal margins, and survivability under space-like conditions. The TVAC testing infrastructure and procedures include:

• High-vacuum chamber capable of achieving pressures below 10⁻³ Pa to simulate the orbital vacuum environment.
• Programmable thermal cycling across a standard qualification range (−20 °C to +60 °C), with demonstrated capability for extended ranges (−60 °C to +120 °C).
• Multi-point temperature sensors are strategically placed to monitor subsystem thermal response.
• Functional testing of satellite subsystems during and after thermal cycling to confirm continuous performance under extreme environmental conditions.

INSTED operates two TVAC chambers, both validated for precision thermal control and pressure stability over the extended qualification range.

Figure 5.4: INSTED’s TVAC
Figure 5.5: INSTED’s Mini-TVAC

Radiation Testing

Radiation testing is conducted to assess the resilience and long-term reliability of satellite electronic components and subsystems when exposed to space radiation environments. The following technical protocols are implemented:

• Total Ionizing Dose (TID) testing: Utilizes gamma irradiation to simulate the cumulative effects of ionizing radiation encountered in low Earth orbit (LEO) over the mission duration, in accordance with relevant space qualification standards (e.g., ESA ECSS-Q-ST-60-15C).
• Subsystem-level exposure: Subjecting critical subsystems to radiation doses equivalent to those expected during long-duration LEO missions, enabling early detection of radiation-induced degradation or failure modes.
• Functional monitoring: Continuous performance assessment of subsystems during and after irradiation to identify threshold failures, parametric drifts, and latent defects.

INSTED conducts radiation testing at qualified partner facilities equipped with calibrated gamma sources and environmental controls to ensure accurate dose delivery and data collection for mission assurance.

Ground Segments

The CubeSat ground segment is composed of ground station hardware, radio frequency (RF) communication subsystems, digital signal processing (DSP) chains, mission control centers, and data management platforms, facilitating end-to-end command, telemetry, and payload data operations. This subsystem is critical for uplink telecommand (TC), downlink telemetry (TM), satellite health monitoring, and anomaly resolution throughout all mission phases. To compensate for limited onboard computational and data storage resources, ground segment systems are engineered for automation, redundancy, and fault tolerance to ensure mission assurance and operational continuity.

Figure 5.6: INSTED’s Ground Segments

Key technical functions of a well-designed CubeSat ground segment include:

• Reliable uplink telecommand (TC) for configuration, control, and contingency operations
• Continuous downlink telemetry (TM) and payload data reception with error correction, time-tagging, and data buffering
• Real-time satellite health monitoring, anomaly detection, and autonomous response protocols
• Mission planning, pass scheduling, and automated post-processing of payload data

CubeSat ground segment infrastructure adheres to the following regulatory and operational standards:

• International and national regulatory frameworks for amateur and commercial satellite service (e.g., ITU, NBTC)
• Space mission operations standards and guidelines (e.g., CCSDS, ECSS)
• Cybersecurity, encryption, and access control best practices
• Configuration management and log traceability requirements

Although ground segment qualification is less prescriptively standardized than space segment testing, modern CubeSat programs increasingly implement structured operational procedures and verification methodologies analogous to those used in larger satellite missions. Beyond routine operations, CubeSat ground segment facilities provide strategic value by:

• Enabling reliable operations for satellites with limited onboard resources
• Supporting simultaneous or constellation-scale mission operations
• Serving as training and certification platforms for satellite operators and mission engineers
• Functioning as institutional or national assets for current and future space programs