METHOD AND DEVICE FOR RECEIVING COMPOUND PHASE-KEYED SIGNALS ON THE BACKGROUND OF NARROW-BAND NOISE Russian patent published in 2004 - IPC

FIELD: radio engineering; noise-immune radio systems handling compound phase-keyed signals.

SUBSTANCE: proposed method includes rejection of signal spectrum sections affected by narrow-band noise, removal of keying pseudorandom train followed by demodulation of signal obtained; the latter is processed in two steps; friendly signal is shaped in the form of coherent radio pulse train whose spectrum has a number of spectral lines; narrow-band noise spectrum is converted into spectrum affecting two spectral lines of friendly signal; correlation processing of signal is effected during rejection of noise spectrum by eliminating respective harmonic components of reference radio-pulse signal. Device implementing proposed method provides for suppressing narrow-band noise without using signal-undistorting strip of great number of composite matched band filters. For solving this problem, device that has multiplier, pseudorandom-sequence generator, synchronizing unit, narrow-band filter, demodulator, as well as control unit and adder, is provided in addition with Q multipliers, Q delay units, Q signal shapers, switching device, set of switches, and spectrum generator.

EFFECT: enhanced noise immunity on the background of narrow-band noise.

2 cl, 6 dwg