The United States employs a advanced network of sensors capable of detecting, tracking, and identifying ballistic missile launches worldwide. This system, which dates back to the Cold War era, has evolved into a highly sophisticated global defense network. A recent example is the detection of a Russian Intermediate-Range Ballistic Missile (IRBM) landing in Ukraine, showcasing the network's efficiency and accuracy.

Advanced Satellites Form the Backbone of Detection
The core of the U.S. missile detection system is the Space-Based Infrared System (SBIRS), consisting of six satellites in geostationary orbit. Operated by the U.S. Space Force, these satellites use infrared sensors to identify the heat signatures of missile launches, ranging from short-range Scud missiles to massive intercontinental ballistic missiles. The heat detection happens within seconds of a missile’s launch, ensuring rapid response.

Lower Orbit Satellites Boost Detection Accuracy
n addition to SBIRS, smaller satellites orbiting at lower altitudes play a crucial role in missile detection. These satellites enhance the response time and accuracy of tracking potential threats. According to William Alberque, a fellow at the Henry L. Stimson Center, this combination creates a fast-response global network capable of pinpointing any missile activity instantly.

Infrared Signatures Enable Quick Identification
Missile launches are primarily tracked by detecting the infrared signatures created by the rocket's exhaust. Each type of rocket has distinct chemical and temperature profiles in its exhaust, allowing sensors to quickly identify the missile type. Alberque noted that the U.S. system's data processing is so advanced that it provides more detailed information about missile launches than ever before.

Ground-Based Sensors Provide Additional Support
Complementing the satellite network, the U.S. utilizes a series of ground-based sensors, including large early-warning radars in the United States, Canada, and the United Kingdom. These radars work in tandem with space-based systems to create a complete picture of a missile’s flight path, speed, and launch angle, aiding in quick identification and analysis.

Coordination Across Agencies Enhances Response
The detection and response to missile threats involve a coordinated effort among various U.S. agencies, including the U.S. Space Force, Missile Defense Agency, National Geospatial-Intelligence Agency, and U.S. Strategic Command. Military commands in specific regions play a crucial role in evaluating threats and determining responses.

Human Analysis Vital for High-Threat Missiles
For short-range missiles that pose minimal danger, automated alerts suffice. However, when long-range missiles or potential threats to U.S. allies are detected, human experts step in to analyze the situation. This ensures that responses are tailored to the specific nature and threat level of the missile.

Russia’s Recent Strike Did Not Indicate Nuclear Activity
Regarding the recent Russian missile attack near Ukraine’s Dnipro, there were no signs of a nuclear threat. William Alberque emphasized that if a nuclear missile were involved, it would produce distinct and easily detectable signatures. The U.S. monitoring systems are equipped to recognize such signatures instantly.

Origins of the Early Warning Systems
The U.S.'s early warning systems began in the 1950s with the aim of detecting bomber formations. Over time, the system expanded to include missile detection, leading to the development of ground-based radars during the Cold War. These early systems were often linked to countermeasures like nuclear-tipped interceptors, showcasing their defensive role.

Future Upgrades to U.S. Missile Detection Systems
The U.S. Space Force is working on a significant upgrade, with plans to invest nearly $15 billion in modernizing its detection capabilities. The Next Generation Overhead Persistent Infrared (OPIR) program will introduce advanced satellites, including geostationary and polar-orbiting ones. The first geostationary satellite is expected to be delivered by 2025, with polar-orbiting satellites to follow by 2028. These upgrades will enhance the U.S.'s ability to detect missile threats swiftly and respond effectively.