Quiet zone generation via interference injections Navy SBIR FY2010.1 Sol No.: Navy SBIR FY2010.1 Topic No.: N101-104 Topic Title: Quiet zone generation via interference injections Proposal No.: N101-104-0669 Firm: Spatial Digital Systems, Inc. 9428 Eton Avenue Suite G Chatsworth, California 91311 Contact: C. D. Phone: (818) 772-2300 Web Site: www.spatialdigital.com Abstract: SDS proposes a quiet zone generation technique by injection of the very interferences at low power level for cancellations. The interference mitigation technique consists of an optimization loop with iterative processing to maintain a quite zone dynamically over an area for a RCV array to operate in full duplex while the nearby XMIT apertures with strong RF leakage are in operation. The optimization loop has three cascaded functional blocks which, respectively, perform the following functions; (1) dynamic injection of the interference signals through an auxiliary XMIT array "distributed" near by the RCV array aperture, (2) feed back signals created by a diagnostic network with probes distributed over the RCV array aperture strategically, measuring the combined field distributions of the interfering signals and generating performance indexes, the "cost functions," accordingly, and (3) iterative controls generated by an optimization processing using cost minimization algorithms based on the cost functions derived from currently measured data. The controls of the auxiliary array elements may be (a) the re-positioning of array elements for optimization of auxiliary array geometries -during the design phase, or (b) the updating of amplitude and phase weighting of the auxiliary array elements - for operation in real time. Benefits: Interference mitigation techniques are very valuable techniques for full duplex operation under a limited space with both XMIT and RCV apertures. The techniques may be applied for mobile communications and radar applications on moving platforms in government markets. For instance FMCW radars may take advantage of the technology to improve their transmission duty cycles. On the other hand, the technology may be modified for many commercial applications for efficient utility of expensive communications equipment. Return