Formation flying and constellation missions using nanosatellites: A comprehensive review of mission architectures, technology enablers and future trends

This comprehensive review analyzes 53 successful multi-nanosatellite missions between 2016 and 2024, all operational over 6 months from established databases, representing 775 satellites enumerated individually in Table 1, across commercial Earth-observation fleets (Planet Labs Flock/SuperDove, 10 batches; Spire Global Lemur-2, 12 batches), IoT constellations (Swarm Technologies SpaceBEE, 10 batches), and smaller scientific, technology-demonstration and educational clusters. Rapid advances in CubeSat technologies have significantly expanded the range of feasible multi-satellite mission architectures. Missions are classified into three architectures: Strictly Controlled Formation ( n = 2, 4%), Constellation Formation ( n = 35, 66%), and Swarm/Cluster Formation ( n = 16, 30%). By primary application the corpus comprises Earth Observation ( n = 28), IoT/Telecommunications ( n = 12), Technology Demonstration ( n = 6), Scientific Research ( n = 5) and Geodesy & Education ( n = 2). All shares reported in this review are mission-weighted unless a satellite-weighted basis is stated explicitly. Technological enablers critically assessed include GPS relative navigation achieving <1 m accuracy (CanX-4/5 heritage), NanoFEEP low-thrust propulsion for formation maintenance and 25-year deorbit compliance when incorporated into an appropriate end-of-life disposal strategy consistent with international debris mitigation guidelines, and swarm intelligence enabling autonomous task allocation. The end-to-end operational lifecycle from PSLV-C37 record-setting 88-satellite Flock-3p deployment through 200 Mbps SuperDove imaging pipelines to Hybrid Adaptive Reconfigurable Fault Tolerance (HARFT) radiation-resilient architectures is systematically mapped. Operational challenges spanning power constraints, collision avoidance, and scalability are systematically paired with validated mitigations across mission scales. A novel decision framework is proposed to guide architecture selection by matching science objectives to GNC complexity levels. Synthesizing operational insights from record-setting commercial constellations and precision scientific formations, this review establishes the complete formation flying design-to-operation methodology, projecting pathways toward hybrid autonomous networks, robotic servicing, and sustainable LEO infrastructure.