Distributed SAR and GMTI using a Cooperative Sensor Network

ABSTRACT: Intelligent Automation, Inc. (IAI) in collaboration with BAE Systems and Professor W. Clem Karl proposes to develop a Cooperative RF Sensor Network. (CORSON) and associated algorithms for distributed RF sensing. CORSON uses a wireless network to synchronize RF sensors on multiple munitions to support distributed cooperative Synthetic Aperture Radar (SAR) and Ground Moving Target Indicator (GMTI) capabilities. We will study CORSON at two different levels of time synchronization: ~10s of ns and ~ps levels. The tight time synchronization mode can support coherent processing in the Ku or Ka bands and is achieved via an IAI-invented round-trip time-of-flight RF ranging technique. The loose time synchronization can support non-coherent processing and is achieved via GPS. Our cooperative SAR algorithm uses recently developed, state-of-the-art Compressive Sensing and sparse reconstruction techniques to produce robust images in the face of the sparse and non-uniform sampling produced by multiple moving radar platforms. Our cooperative GMTI algorithm is based on the multi-static Space Time Adaptive Processing technique. A wireless data network is used to exchange information among munitions engaging the same set of surface targets, and a RF syncing signal is used to establish synchronization between the different RF sensors. BENEFIT: The key commercial value of CORSON is its ability to offer revolutionary enhancements to the sensor performance by small and low-cost sensors in order to achieve the same level of sensitivity, clutter rejection, and anti-jamming capabilities as a larger and more expensive sensor. CORSON will provide a robust networking system and efficient SAR and GMTI processing for surveillance, reconnaissance, and target engagement. CORSON can also enable Navy"s Littoral Combat Ship (LCS) to use multiple unmanned surface vehicles (USV) and unmanned underwater vehicles (UUV) to perform cooperative sensing. Private firms may use synchronized wireless sensors with multiple modalities to perform distributed sensing, intruder detection, and target classification. First responders can use CORSON"s GMTI capability to detect victims in search and rescue operation in cluttered environments such as rough sea and forest. Similarly, law enhancement can use CORSON"s SAR capability to detect persons or facilities hidden under camouflage in border patrol or counter-drug operations. Natural resource companies may use CORSON"s to conduct super sensitive remote sensing for natural resource exploration.