Abstract: The present invention relates to receiver systems for receiving trains of pulses transmitted by satellites. The receiver system is characterized by the fact that it includes receiver means (100) for receiving pulses trains transmitted by the satellites and suitable for delivering signal trains representative of pulse trains, first compression means (102) for compressing signal trains by a factor n having an input (103) connected to the output (101) of the receiver means (100), demodulator means (104) having three inputs (105, 106, 107), the output (122) of the compression means (102) being connected to the input (105), a satellite code signal generator (108) connected to the demodulator means (104), a Doppler shift carrier signal train generator (109), and second compression means (102) connected between the generator (109) and the demodulator means (104).

Abstract: The invention is a method that considerably improves the rapidity of collection and recognition of electrical signals that are mixed with other signals that impede direct access. The subject of the invention is a method for detection, recognition and use of significant trains of modulated signals on a carrier frequency. The apparatus which provides for the method utilizes a sole crystalline Bragg cell wherein two signal trains travel colinearly through the cell.