Radio signalling equipment

Details Radio signalling equipment Radio signalling equipment

H - Electricity

04

K

343/23

H04K 1/00 (2006.01) F42C 13/04 (2006.01) G01S 7/30 (1985.01)

Patent

CA 1221755

ABSTRACT Radio signaling equipment, including receiver apparatus, for receiving signals phase-modulated by a predetermined code sequence of code signals having a predetermined regular digit-signal rate. The apparatus further includes a decoding means for applying a sequence of phase-shifts to the received signal; first and second signal paths; a multi-tap delay means connected in at least one of the signal paths for progressively integrating signals in one of the signal paths; and a signal mixer means to receive at one input the integrated signals and at a second input signals from the second signal path. A time delay between adjacent taps on the multi-tap delay means is an integral multiple of the bit duration. The signal mixer derives an auto-correlation signal whose magnitude is dependent on the relative phases of the signals so received. In one form, the delay means is an acoustic delay line having a plurality of transducers equispaced along its length.

266531

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