For decades, satellites have provided critical data for military activities in active and non-active combat zones. One of the most significant integration of space-based technologies emerged in missile defense systems during the Cold War. Satellite constellations provided critical data on the launch sites and trajectories of ballistic missiles. The US Defense Support Program (DSP) was the first program to launch satellite constellations to detect heat signatures of Soviet ICBMs with infrared sensors. The Soviet Union launched the first generation of early warning systems under OKO satellite constellations against US missile threats. These systems of satellite constellations allowed both the US and the USSR to maintain a close watch over each other’s strategic capabilities and allowed for much needed early warning that upheld mutual deterrence between the two powers.
Fast forward to the current era, today’s missile defense systems have shown a very limited success rate against hypersonic missiles. The tracking and interception capabilities of current missile defense systems have remained effectively limited due to speed, maneuverability, and depressed flight of hypersonic missiles. Traditional missile defense systems have been outmaneuvered by hypersonic missiles, which increases the threat level due to their capability to reach and hit targets with a high success rate. Modern hypersonic missiles can still be detected with infrared sensing during their boost phase, but Hypersonic Glide Vehicles (HGVs) are extremely difficult to track and intercept primarily due to their maneuverability. The radar-evading capabilities of HGVs affect the strategic calculus by shrinking detection and reaction time duration during crises and conflicts.
As a remedy, the US has introduced the Hypersonic and Ballistic Tracking Space Sensors (HBTSS) to counter the threat of HGVs and Hypersonic Cruise Missiles (HCMs). The HBTSS will be a major component of the US Golden Dome missile defense project. It is a layered network of command-and-control systems, interceptors, and space-based sensors to build an advanced layer of missile defense system. What makes HBTSS different from traditional missile defense systems is the satellite constellation, which provides real-time tracking data of missiles. Traditional defense systems like Space Based Infrared System (SBIR) could detect the launch of missiles, but HBTSS can detect, track, and possibly predict the target of the missile.
Because HGVs present a unique challenge due to low flight path and maneuverability and often operate under the coverage of conventional radars, which make it difficult for traditional defense systems to detect. HBTSS relies on space-based sensors, which can detect and track continuously from space. Theoretically, it can be called a space-based missile defense system reflecting the growing strategic importance of space in the military domain. It relies on an interconnected satellite network that can work as a kill web across the globe against the threat of hypersonic missiles.
HBTSS is an emerging strategic shift as it starts a new era of space weaponization with a layer of satellites for enhanced detection and tracking. A reliable space-based tracking system bolsters a state’s capabilities to deal with the threat of hypersonic missiles with improved early warning and missile tracking systems, and reduces the threat of surprise attacks from an adversary. Although missile forces hold great impact on deterrence stability, the induction of HTBSS will question the effectiveness of missiles during crises and conflicts if a more advance missile defense system is introduced. This will provide a wider view from space with more accuracy and precision, and increase the vulnerability of missile forces of states.
Because ground-based nuclear forces are considered vulnerable, many countries have developed second-strike capabilities, particularly at sea, to preserve deterrence even after absorbing an initial attack. But the development of HBTSS undermines the survivability of a state’s missile forces with an enhanced detection and tracking system. Even though the United States and Russia continue to maintain certain crisis management and risk reduction mechanisms, including hotlines and military deconfliction channels, the suspension of New START has weakened the broader framework of strategic stability. While in conflict-prone regions like South Asia, India and Pakistan possess a more limited and less institutionalized set of confidence-building measures (CBMs), making crisis management in South Asia particularly challenging due to emerging technologies.
The peaceful use of outer space depends on the intent and actions of major powers. Sometimes measures taken for self-defense can also prompt a proportionate reaction in the form of countermeasures. The strategic impact of HBTSS on the missile forces may lead to more advance, fast, and lethal missiles for survivability. The development of HBTSS will not end the arms race, it will intensify the arms race with countermeasures.
