Space has moved from being a supporting element of military power to becoming a decisive operational domain. Communications, navigation and timing, intelligence, surveillance and reconnaissance (ISR), missile warning, weather, targeting, precision strike and battle management increasingly depend upon satellites. Modern armed forces therefore do not merely use space; they increasingly have to operate, defend and, where necessary, contest the space domain.
This transformation has made Space Domain Awareness (SDA) one of the most important prerequisites for military readiness. If commanders cannot know what is happening in space, identify whether an event is natural or hostile, understand its consequences and attribute an action to its source, they cannot effectively protect their space architecture or conduct space operations.
The rapid expansion of satellites has made this challenge even more complex. The number of operational satellites has increased dramatically, driven especially by the United States’ commercial and government constellations and China’s rapidly expanding space programme. ISRO’s latest Indian Space Situational Awareness Report records that 4,198 known operational satellites were placed in orbit during 2025, while the global space-object population continued to grow rapidly. By the end of 2025, 9,396 Starlink satellites remained in orbit.
Space—the final frontier of military power
For much of the twentieth century, land, sea and air were regarded as the principal domains of warfare. Space initially served mainly as a high ground for observation and communication. The character of warfare has now changed. A military operation on Earth can be critically dependent upon assets hundreds or thousands of kilometres above it.
A modern military force without assured access to space could suffer degradation in communications, positioning and navigation, intelligence collection, missile warning and precision targeting. The United States Space Force explicitly describes space superiority as necessary to protect U.S. space assets and identifies orbital warfare, electromagnetic warfare and space battle management among its core missions.
The U.S. Space Force’s 2025 Space Warfighting Framework goes further, treating space superiority as an essential element for military operations across all domains. It identifies SDA, intelligence and attribution as necessary components of effective space operations and deterrence. This is a fundamental conceptual shift: space is no longer simply an enabler of terrestrial warfare; it is itself an operational battlespace. US formally admitted in August 2026 that they have placed weapons in space without giving supportive details.
The satellite explosion and the problem of congestion
The satellite revolution has created unprecedented opportunities but also an unprecedented awareness problem. Mega-constellations, small satellites, rideshare launches and commercially operated spacecraft have transformed the orbital environment.
The United States remains the largest space actor by satellite numbers, largely because of its enormous commercial constellation sector. China, meanwhile, is expanding rapidly across communications, remote sensing, navigation, ISR and other space capabilities. The U.S. Department of Defence reported that China had more than 500 ISR-capable satellites by 2024 and that its expanding satellite architecture was improving its ability to monitor military activity and support long-range targeting.
China’s expanding space architecture also creates a corresponding requirement for sophisticated surveillance and tracking. U.S. Space Force reporting states that China uses at least 10 satellites for space situational awareness, supplementing terrestrial space-object surveillance and identification systems.
The result is an orbital environment that is increasingly congested, competitive and potentially contested. The challenge is not merely knowing where a satellite is. It is knowing what it is doing, what it is capable of doing, what has changed, and whether that change represents an emerging threat.
From Space Situational Awareness to Space Domain Awareness
Traditional Space Situational Awareness (SSA) focused primarily on the physical environment: detecting, tracking and cataloguing satellites, debris and other objects. SDA is broader. The U.S. Space Force describes SDA as encompassing activities that detect, characterize, attribute and predict activities in space to inform decision-making. This distinction is crucial for warfare.
Suppose an adversary’s satellite approaches another spacecraft. The first question is detection. The second is identification. The third is intent. Is it a routine orbital manoeuvre, inspection activity, intelligence collection or preparation for interference? Similarly, if a communications satellite suddenly loses performance, the cause may be a solar event, equipment failure, cyber intrusion, electromagnetic interference or deliberate attack.
Therefore, SDA has to combine: space surveillance and tracking; satellite telemetry and behavioural analysis; electromagnetic-spectrum monitoring; optical and radar observations; cyber information; intelligence inputs; space weather; orbital prediction; artificial intelligence and machine learning; commercial data; and information from allied and partner networks. The objective is to transform enormous volumes of observations into operational knowledge.
Threats must be detected before they become effects
Space warfare may not begin with an explosion. It may begin with something apparently insignificant: a change in satellite attitude, an unusual orbital manoeuvre, electromagnetic interference, degraded telemetry, abnormal command traffic or a cyber anomaly.
The five operational effects of denial, disruption, deception, destruction and delay illustrate why SDA matters. Denial prevents access to a space-enabled service. Disruption interferes with its normal operation. Deception causes a system or commander to receive misleading information. Destruction physically removes or disables a capability. Delay slows the delivery of information or effects sufficiently to affect military decision-making.
The difficulty is that these effects may initially resemble technical failures. Consequently, attribution becomes as important as detection. The U.S. Space Force’s warfighting framework explicitly links trusted attribution with deterrence. SDA therefore becomes the foundation for answering three questions: What happened? Who or what caused it? What does it mean for the mission? Without credible answers, a commander may either fail to respond to an attack or respond unnecessarily to an event that was not hostile.
Space resilience: surviving after detection
SDA alone does not make a space architecture resilient. Knowing that an adversary is attempting to interfere with a satellite is useful only if the satellite, constellation or wider military system can continue functioning. Resilience therefore has to be designed at several levels: proliferation, redundancy, manoeuvrability, encryption, cyber protection, alternate communications, rapid reconstitution and cross-domain alternatives.
The U.S. Space Force has identified resilient satellite architecture alongside SDA and counter-space capabilities as major priorities for operating in a contested environment.
The lesson is particularly important for countries developing increasingly space-dependent militaries: the objective should not merely be to protect individual satellites, but to preserve the military effect when individual satellites are degraded or lost.
Autonomous warfare and SDA
Another major transformation is the convergence of SDA with artificial intelligence and autonomous systems. The volume of orbital data is already too large for humans to analyse manually in real time. Automated systems can correlate observations from multiple sensors, detect anomalies, predict conjunctions, identify unusual manoeuvres and alert operators to potentially hostile behaviour.
The future space warrior will therefore increasingly operate within a human-machine decision environment. This does not mean handing strategic decisions completely to autonomous systems. Rather, AI can perform high-speed detection, correlation and prediction while humans retain responsibility for interpretation, escalation and decisions involving the use of force.
The emergence of autonomous warfare makes accurate SDA even more important because machines can act only as intelligently as the information environment in which they operate.
SDA simulators: preparing the space warrior
Space warfare cannot be trained adequately by classroom instruction alone. The orbital environment is too complex, dynamic and technically specialised. This is where SDA simulators, digital twins and synthetic training environments become critical. The U.S. Space Force’s Operational Test and Training Infrastructure is developing live, virtual and constructive environments incorporating digital models, simulators, adversary representations and synthetic space environments. These systems allow Guardians to train against realistic orbital and counter-space scenarios without waiting for an actual crisis.
An SDA simulator can recreate a congested orbital environment containing friendly satellites, adversary spacecraft, debris, jamming, cyber events, manoeuvring objects, sensor uncertainty and space-weather effects. Operators can then be presented with a rapidly changing scenario and asked to: detect an anomaly; identify the object or system involved; determine whether the behaviour is hostile; assess its effect on the mission; correlate multiple sources of information; attribute the activity; recommend defensive or operational responses; and reassess the situation as the adversary changes tactics.
This creates something extremely valuable: decision-making experience before the real crisis occurs.
Academia must build the next generation
Perhaps the most important long-term requirement is human capital. Space warfare requires specialists who understand orbital mechanics, satellite engineering, remote sensing, RF and electromagnetic warfare, cyber security, AI, international space law, intelligence analysis and military strategy. No single traditional discipline can provide this complete skill set.
Universities therefore have to create interdisciplinary programmes in space security, SDA, space operations and space warfare. Simulation laboratories can allow students to operate virtual constellations, analyse orbital behaviour and experiment with contested-space scenarios. India already has an institutional foundation. ISRO’s NETRA programme is expanding India’s ability to observe and track space objects, while ISRO’s 2025 report records continuing development of radar and optical observation infrastructure.
The next step is to connect this national infrastructure with academia, industry, defence organisations and international partners.
India’s opportunity
For India, SDA should increasingly be regarded not merely as a space-safety function but as a component of national security and military readiness. India’s dependence on space for communications, navigation, ISR and other military functions will increase as its space architecture expands. Its SDA architecture must therefore evolve from tracking objects to understanding the space operational environment.
The future Indian SDA system should integrate radars, optical telescopes, RF sensors, satellite telemetry, cyber information, commercial data, AI-enabled analytics and allied information-sharing arrangements. Most importantly, India needs trained space warriors, space operators, analysts, engineers and strategists who can convert data into decisions.
Conclusion
The central proposition is simple: you cannot defend what you cannot see, and you cannot respond intelligently to what you cannot understand. Space warfare readiness therefore begins with Space Domain Awareness. As satellites proliferate and space becomes increasingly integrated with autonomous warfare and joint military operations, SDA will provide the knowledge layer connecting sensors, satellites, intelligence, command-and-control and decision-makers. It will help distinguish accident from attack, technical failure from interference and routine manoeuvre from hostile action.
The ultimate contest in space may not be decided simply by who possesses more satellites or more powerful spacecraft. It may increasingly depend upon who can see the space domain faster, understand it better, attribute actions more confidently and continue operating when that domain becomes contested. That makes SDA not simply a surveillance function. It is becoming the eyes, ears and cognitive foundation of space warfare readiness.
ABOUT THE AUTHOR
Lt Gen (Dr) PJS Pannu, PVSM, AVSM, VSM, P.hD (Retd), is a Chief mentor and Dean of Department of Space Studies at MERI Group. He is a former Deputy Chief IDS who pioneered raising of Defence Space Agency, Defence Cyber agency and Special forces Division. He is the author of a book titled Taramandal Sangram (Space wars), He is Senior Advisor to SIA ( India) and founder of Space Club of India
