The U.S. Area Power is including three dozen spacecraft to its rising constellation designed to detect and observe incoming missiles from orbit. The Area Growth Company (SDA) introduced the agreements, price a mixed $1.75 billion, on July 14, naming L3Harris Applied sciences and Sierra Area because the recipients.
Every firm will present 18 Accelerated Missile Protection Tranche 3 (AMDT3) spacecraft, for a complete of 36 satellites that can develop the SDA Proliferated Warfighter Area Structure’s Tranche 3 Monitoring Layer constellation, a part of the Trump Administration’s Golden Dome initiative. All 36 are anticipated to be prepared for launch by the top of 2028, in response to an SDA assertion.
SDA’s contracts with every firm differ barely. One requires “18 missile warning and missile monitoring variant house automobiles” from Sierra Area, whereas the opposite requests “18 missile protection variant house automobiles” from L3Harris, all geared up with infrared sensors so as to add to the constellation’s world community.
L3Harris will obtain as much as $955 million for its 18 satellites, which the Area Power describes as “Hypersonic and Ballistic Monitoring Area Sensor-like” (HBTSS) spacecraft. Sierra Area’s settlement has the potential to achieve $798 million for its 18-satellite contribution. Altogether, the 36 spacecraft can be distributed throughout 4 orbital planes as a part of a hybrid missile-defense structure designed to offer “world stereo protection” of next-generation missile threats.
The Monitoring Layer makes use of infrared imaging in low Earth orbit to detect and observe missiles, and it transfers that information in actual time by means of a low-latency communications community to army forces on the bottom. In keeping with the company, the brand new satellites will enhance the constellation’s protection and combine into the spacecraft of SDA’s first three Tranches.
“AMDT3 expands upon SDA’s earlier and present Monitoring Layer generations — Tranches 1, 2 and three,” stated SDA Director G.P. Sandhoo, “marking one other milestone in delivering a resilient, world missile warning, missile monitoring, and missile protection functionality.”
Sierra Area will base its satellites on the Horizon automobile, from the corporate’s Eclipse satellite tv for pc sequence, which it additionally used within the design of the spacecraft it supplied for the Tranche 2 Monitoring Layer program, in response to a Sierra Area launch.
L3Harris plans to construct on the success of the HBTSS satellites the corporate developed for the Navy Protection Company, in response to an L3Harris launch. The corporate “has greater than 70 missile monitoring and protection satellites on order, together with 5 on orbit, between MDA’s HBTSS program and SDA’s Monitoring Layer throughout Tranche 0, 1, 2 and three,” the corporate stated.
The 36 satellites from L3Harris and Sierra Area are along with the 72 Tranche 3 Monitoring Layer spacecraft SDA ordered in December 2025, through contracts price $3.5 billion. L3Harris was included in these agreements as effectively, together with Lockheed Martin, Rocket Lab and Northrop Grumman. In complete, the 2 rounds of awards carry the Tranche 3 constellation to a deliberate 108 satellites, price about $5.25 billion. If all goes to plan, all of them can be obtainable to launch by the top of 2029.
The newly contracted satellites from L3Harris and Sierra Area might start heading to house ahead of that, nevertheless. SDA describes the brand new contracts as “accelerated,” although a launch timeline has not been established to the general group. As soon as in orbit, the Area Power will assume duty for the satellites’ operation and integration “in help of joint power operations and delivering warfighting capabilities,” the SDA assertion stated.
