Adaptive-array algorithm for interference suppression prior to acquisition of direct-sequence signal

Strong directional interference can prevent code acquisition in a direct-sequence system, thereby rendering the system inoperable. Previously proposed adaptive-array algorithms designed to enhance code acquisition are incapable of suppressing directional interference and may even amplify it. The recursive suppression algorithm is shown to dramatically reduce the interference level relative to that of a desired direct-sequence signal before code acquisition has been achieved. Since the adaptive-processor output, which is applied to the acquisition system, has a much smaller interference component, the code acquisition process is greatly facilitated.