Tracking Layer

The Wide Field Of View (WFOV) Overhead Persistent Infrared (OPIR) sensor, also known as Tracking Layer Tranche 0, is a new missile early warning satellite constellation sponsored by the US Space Force (USSF) Space Development Agency (SDA). The constellation is expected to deploy eight spacecraft (Tranche 0) beginning in September 2022 and thereafter the constellation might grow to 20 (Tranche 1) and finally up to 200 spacecraft (Tranche 2). The satellites are intended to provide missile tracking for hypersonic glide vehicles as well as emerging missile threats. L3Harris Technologies and SpaceX were selected for the Tracking Layer Tranche 0 program in early October 2020. Both companies are expected to build four spacecraft each. The Tracking Layer is expected to become part of the HBTSS constellation. The US Space Development Agency selected L3Harris and Northrop Grumman to build 28 Tranche 1 Tracking Layer satellites with 14 to be build by earch company. The $1.3 billion contract was awarded on July 18, 2022, with the first launch expected by April 2025.

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