Interceptor Seekers

We propose a large-format collinear LWIR Type II Strained Superlattice (SLS) Focal Plane Array with digital signal readout and near-focal-plane digital image processing that can reduce demands on computer power and data bandwidths. This proposed approach, supported by Lockheed Martin, is based on a novel dual pixel design that consists of using pairs of adjacent pixels each connected in an inverted, parallel configuration. With this invention, common mode rejection of incident radiation and lock-in signal detection can be embedded into all pixels on the focal plane. The inherent background rejection in this pixel design is expected to increase immunity to strong backgrounds (sun, moon, or earth-limb) that may blind a KV and cause target unlock. Noise mitigation is achieved by the unique ability of this structure to code input optical signals with a polarity modulation pattern that permits signals to be recovered by lock-in signal processing. The combined feature set of this technology can permit the development of a new generation of low-cost, high-performance miniature interceptors.