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Sensors are subdivided into the following:
Since the radars are so conventional, they are of no concern to the issue of space militarization. The space-based systems, such as the Space Based Infrared System, and Space and Missile Tracking System, on the other hand, propose a major concern.
Space Based Infrared System, or SBIRS, is a program that is intended to combine the activities of the existing development programs into a single integrated program to most effectively meet the military's infrared surveillance requirements. SBIRS is built to replace the current Defense Support Program and related systems. SBIRS operational requirements include four mission areas of missile warning, missile defense, technical intelligence, and battlespace characterization. SBIRS is composed of eight satellites, four of which oscellate around Earth's geocynchronous orbit (GEO), two are on the highly elliptical orbits (HEO, or SBIRS-high), and two more are on the low Earth Orbit (LEO, or SBIRS-low).
Space and Missile Tracking System, or SMTS, is a conscellation of 12-24 satellites, orbiting Earth on low orbits. SMTS is designed to collect data and transfer it to the processing unit, which in its turn can send the alarm signal to activate space-based lasers to provide quick response, and target incoming missiles. The importance of this system is that utilizing its capacity, the alarm response can be quick enough to be able to intercept a missile in the boost stage of its trajectory. That is, the missile can be intercepted over the enemy (launcher) territory withing seconds of its launch.
Space-based lasers are another component necessary for the boost-phase interception.
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