Abstract: A location of a target is generated by, at each of a plurality of reference sensors, receiving signals from a plurality of positioning system satellites. A set of error measurements are generated by generating, for each of the reference sensors, one or more error measurements based on a reference location of the reference sensor and information derived from the signals received at the reference sensors from the plurality of position system satellites. Single differenced velocity corrections are also generated. At a central processing node, a meta-correction surface is generated from the set of error measurements. The meta-correction surface is then transmitted to a non-reference sensor. At the non-reference sensor, signals are received from a plurality of the positioning system satellites. The meta-correction surface and the signals received from the plurality of position system satellites are used to generate the location of the target.

Abstract: The present invention relates to a method and apparatus for selectively receiving a radio frequency (RF) signal which utilizes an array of antenna elements for receiving the RF signal, a navigational controller for determining a pointing vector from coordinate information, and beam-forming electronics connected to the array of antenna elements and the navigational controller for forming reception lobes. This apparatus and method are particularly useful in the context of a Global Positioning System (GPS) for selectively receiving RF signals from GPS satellites to determine location and timing information. In one embodiment of the present invention, the phase of the elements of the array are adjusted to form selective reception lobes and constructively amplify signals within these reception lobes, increasing the signal-to-noise ratio (SNR) with respect to noise or interference signals outside the lobes.