U.S. Space Force Awards L3Harris $955M for 18 Missile-Tracking Satellites to Support Golden Dome.

The U.S. Space Force has selected L3Harris Technologies to build 18 missile-tracking satellites under an agreement worth up to $955 million, awarded by the Space Development Agency on July 13, 2026. The spacecraft are designed to generate fire-control-quality tracks against ballistic missiles and maneuvering hypersonic weapons, strengthening the sensor layer needed for earlier warning and more precise interception.

The satellites will operate across two orbital planes and are scheduled to be ready for launch by the end of 2028. Combined with a parallel 18-satellite award to Sierra Space, the program will field 36 spacecraft across four planes, expanding persistent missile detection and tracking coverage for future integrated air and missile defense.

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L3Harris will build 18 infrared missile-tracking satellites for the U.S. Space Force under a contract worth up to $955 million, providing fire-control-quality data against ballistic missiles and maneuvering hypersonic weapons (Picture source: L3Harris).

The distinction between the two satellite variants is operationally important. Missile-warning sensors must survey large areas, detect an infrared event, classify it and establish an initial track; missile-defense sensors must then measure the target’s position and movement accurately enough to support an interceptor engagement. The L3Harris satellites therefore do not carry interceptors or any other armament. Their military output is a track file containing estimates of target position, velocity, trajectory, and associated uncertainty. “Fire-control quality” means that the data must be sufficiently accurate, timely and continuous for a weapon-control system to calculate an intercept solution. SDA and L3Harris have not published the required angular accuracy, update rate, sensor aperture, spectral bands, focal-plane resolution, or maximum track capacity, and those figures should not be inferred from company descriptions.

The payload is described as a medium-field-of-view infrared sensor derived from the Hypersonic and Ballistic Tracking Space Sensor program initiated by the Missile Defense Agency in 2018. A narrower observation area generally permits more precise angular measurement than a broad-area warning sensor, but it also requires reliable cueing because the sensor cannot search the entire visible Earth at the same time. The intended sequence is therefore cooperative: a missile-warning satellite detects the launch or glide vehicle, passes a cue to one or more precision-tracking satellites, and the medium-field-of-view sensors maintain custody as the target changes altitude, speed, or direction. Observations from satellites in different orbital positions support stereo tracking, using separate lines of sight to improve the estimate of the target’s three-dimensional location. This matters most for hypersonic glide vehicles, which fly lower than traditional ballistic re-entry vehicles, maneuver during flight, and can remain below the line of sight of terrestrial radars until relatively late in an engagement.

The AMDT3 spacecraft will operate within the Proliferated Warfighter Space Architecture rather than as an independent constellation. SDA’s Tranche 3 specification states that Tracking Layer satellites carry infrared payloads, optical communications terminals, Ka-band communications equipment and an S-band backup telemetry, tracking and command system. Optical crosslinks are intended to move sensor data between satellites without requiring every observation to be routed first through a ground station. The Transport Layer then carries the track through a low-latency mesh network, while Ka-band links, ground entry points, and tactical data links distribute it to command centers and potentially to missile-defense units. This communications chain is as important as the infrared payload: a precise track that arrives after the interceptor’s engagement window has closed has limited tactical value. Actual compatibility with weapons such as a future Glide Phase Interceptor, Aegis missile-defense interceptors, THAAD, or Ground-Based Midcourse Defense will still depend on interface development, testing, and certification. The contract itself does not provide those interceptors.

The procurement also represents a transition from prototype testing to larger-scale deployment. Two HBTSS demonstration satellites, one supplied by L3Harris and one by Northrop Grumman, were launched on a SpaceX Falcon 9 from Cape Canaveral Space Force Station on February 14, 2024. MDA planned two years of orbital testing to evaluate tracking performance and integration with the wider Missile Defense System. L3Harris reported in April 2026 that its satellite had tracked a live hypersonic target with the latency and track fidelity required for an end-to-end missile-defense sequence. That claim establishes a relevant test history, but public information does not disclose the target trajectory, duration of custody, measurement errors, number of sensors participating, or whether an interceptor-quality solution was transmitted to an operational weapon. AMDT3 will test whether that demonstration can be reproduced across 18 satellites operating through a common ground system.

The July award is additional to the 72 Tranche 3 Tracking Layer satellites ordered by SDA on December 19, 2025, for approximately $3.5 billion. Those earlier agreements covered eight orbital planes and were divided among Lockheed Martin, Rocket Lab, Northrop Grumman and L3Harris. Combining the two announced procurements gives Tranche 3 a planned total of 108 tracking and missile-defense satellites across 12 orbital planes, with agreement values of approximately $5.25 billion. L3Harris alone now holds two Tranche 3 agreements: $843 million for 18 missile-warning and missile-tracking satellites and up to $955 million for 18 HBTSS-like missile-defense satellites, or $1.798 billion for 36 spacecraft. Dividing the AMDT3 ceiling by 18 gives approximately $53.1 million per spacecraft-equivalent, but that figure is not a published unit procurement cost because the agreement may include engineering, integration, testing, ground support, and other deliverables.

Industrial capacity is one reason SDA can require launch availability by the end of 2028 rather than wait for a later Tranche 3 schedule. L3Harris completed a $125 million expansion of its 95,000-square-foot Fort Wayne facility in April 2025 and stated that the site could produce 48 infrared payloads annually. In August 2025, the company completed a separate $100 million, 94,000-square-foot satellite integration and test expansion in Palm Bay, including three high bays for parallel assembly. These investments do not eliminate supply-chain or integration risk, but they provide dedicated production space for payload manufacture, spacecraft assembly, and environmental testing. The L3Harris order also reduces the need to establish a new production line for AMDT3 because the company is already building satellites or sensors for HBTSS, SDA Tranches 0 through 3, and the eight-satellite FOO Fighter fire-control experiment.

For the United States, the contract is significant because interceptor performance is constrained by sensor coverage and track quality. A maneuvering target cannot be engaged reliably if the defensive network loses custody between initial warning and terminal radar acquisition. The additional orbital planes increase the probability that more than one infrared sensor can observe a target, provide alternative routing paths if a satellite or link fails, and support both homeland and regional missile defense. However, Congress will need to assess the program against demonstrated results rather than spacecraft delivery numbers alone. In January 2026, the Government Accountability Office reported that the wider architecture was expected to include at least 300 to 500 satellites, cost nearly $35 billion through fiscal year 2029, and require replacement of spacecraft approximately every five years. GAO also found that SDA had overestimated the maturity of some technologies, lacked an architecture-level schedule, and did not have a reliable life-cycle cost estimate. The AMDT3 award is therefore important not because 18 satellites constitute a complete missile shield, but because they are intended to convert warning data into continuous engagement-quality tracks. Its value will depend on launch execution, multi-vendor interoperability, ground processing, communications latency, and successful connection to operational interceptors.

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