A novel eigenvector-based adaptive nulling algorithm, intended fornanti-jam uplink satellite communications applications, is presented. Thenalgorithm exploits a priori knowledge of high-power user terminalnlocations, together with the signal covariance matrix, to determine anbasis set for the estimated jammer space. The computed signal weightnvector is orthogonal to the estimated jammer space and maximally couplednto the user space. The nulling system is configured to suppress jammersnexceeding a preset power threshold. Low-power, ineffective jammersncannot saturate the nuller. Theater coverage for low-power,nlow-data-rate users operating below threshold is facilitated throughnsynthetic auxilliary user signals which are added to the signalncovariance matrix. Simulation results are presented involving a 19-beamnmultiple beam antenna
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