QUASI-COHERENT MODULATOR OF QUADRATURE PHASE-SHIFT KEYING SIGNALS

摘要

FIELD: radio engineering.;SUBSTANCE: invention relates to radio engineering and can be used in telecommunication systems and digital data transmission in radio systems. Device comprises tuned generator 1, reference oscillation generator 2, first and second phase detectors 3 and 4, a phase changer 5 on π/2, first and second voltage comparators 6 and 7, pulse generator 8, time delay line 9, XOR logical circuit 10, reversible counter 11, digital-analogue converter (DAC) 12, first adder 13, signal polarity switch 14, first signal multiplier 15, integrator 16, first scaling voltage divider 17, second adder 18 and loop gain setting and stabilising 19 unit (BUSPU) comprising first and second units for raising current voltage value to power of two 20 and 21, third adder 22, unit for raising current voltage value to power of ½ 23 and second voltage divider 24, and also includes keying control unit 25 (BUM) which includes second, third, fourth and fifth signal multipliers 26, 27, 28 and 29.;EFFECT: purpose of invention is integrated (simultaneous) improvement of main parameters of quasi-coherent modulator, particularly a wider capture range and retaining a synchronous operating mode, shorter time for entering synchronous operating mode, high accuracy and stability of shift-keyed phase samples in presence of destabilising factors affecting loop gain of device.;2 cl, 4 dwg