Abstract: A method and apparatus for altering the coordinates obtained by satellite navigation in a receiving system which fixes an incorrect position, instead of a true position, within a given three-dimensional zone. In connection with altered coordinates, additional navigational information such as course and speed can also be influenced. Specifically, signals are received from a site and re-emitted in a suitable way so that a navigation receiver determines the position of the receiving site within the three-dimensional zone covered by the emission. This approach is superior to noise-blanketing countermeasures (such as carrier or noise interference) in that precise but untrue coordinates are determined in the navigation receiver, without this incorrectness being immediately recognized.

Abstract: A method and apparatus for altering the coordinates obtained by satellite navigation in a receiving system which fixes an incorrect position, instead of a true position, within a given three-dimensional zone. In connection with altered coordinates, additional navigational information such as course and speed can also be influenced. Specifically, signals are received from a site and re-emitted in a suitable way so that a navigation receiver determines the position of the receiving site within the three-dimensional zone covered by the emission. This approach is superior to noise-blanketing countermeasures (such as carrier or noise interference) in that precise but untrue coordinates are determined in the navigation receiver, without this incorrectness being immediately recognized.

Abstract: An antenna array for a radiolocation system, consisting of three loop antennas in mutually orthogonal planes and three dipole antennas extending along the intersections of these planes, is scanned by a pair of synchronized multplexers sequentially connecting two receiving channels to different loops and to different dipoles in a recurrent cycle. The loop and dipole voltages concurrently appearing in the outputs of the two receiving channels are fed to an analog multiplier; the resulting product, after filtering and integration, is converted to digital form and written into a memory stage assigned to the respective loop/dipole combination. The registered products are sequentially read out, in the rhythm of the scan, and are processed in a digital calculator to yield azimuthal and/or elevational data which are stored and visually displayed.