DEVICE FOR DETERMINING LOCK-ON OF PHASE-LOCKED LOOP SYSTEM Russian patent published in 2010 - IPC H03L7/00 

FIELD: physics, communications.

SUBSTANCE: invention relates to communication engineering and can be used in different devices based on phase-locked loop systems, particularly in phase-shift keyed signal receivers for generating reference voltage during locked-in detection. The device has a phase-locked loop system which includes two quadrature channels, each of which has a quadrature mixer and a signal accumulator at the output of which current corresponding values of signals A_i and B_i are generated, a discriminator, a control law former, a unit for prohibiting target designation input, a frequency synthesiser, a device for secondary signal accumulation during the detection interval T_det, a comparator, a memory element. The device for secondary signal accumulation during the detection interval is made such that, accumulation takes place through addition of the difference between current values of moduli of A_i and B_i from outputs of signal accumulators respectively.

EFFECT: possibility of setting any detection threshold.

3 dwg