C4ISRNET

The Senate’s annual defense policy bill would authorize an additional $120 million toward a space-based sensor layer capable of tracking hypersonic weapons, despite the fact the Department of Defense did not seek more funding for the project in its fiscal 2021 budget requests.

The Hypersonic and Ballistic Tracking Space Sensor is DoD’s answer to the growing threat posed by hypersonic weapons being developed by China and Russia. Hypersonic weapons present a significant challenge to the United States’ current missile warning architecture. Not only can these weapons maneuver around ground based sensors, they’re too dim to be picked up and tracked by space-based sensors in higher orbits.

HBTSS theoretically solves this problem via a proliferated constellation of Overhead Persistent Infrared (OPIR) sensors operating in low earth orbit. At that lower orbit, the sensors will be able to pick up and track the otherwise dim objects. But because the satellites are closer to the earth and have a limited field of view, the system will need to pass off custody responsibility from sensor to sensor as the weapons traverse the globe. Hence the need for a proliferated constellation.

HBTSS will plug into the Space Development Agency’s National Defense Space Architecture, a new system of satellites operating in low earth orbit.

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