SU126519A1 - Phasing method of variable correction step systems - Google Patents

Description

Known methods and devices for phasing systems, built on shift registers with ferrites. In such devices, phasing occurs by adding or knocking out pulses applied to the input of an intermediate frequency divider.

A disadvantage of the known methods of phasing is that they have a constant correction effect regardless of the phase mismatch angle. As a result, the optimal arrangement of the recording moments in the presence of dominance is not justified, and the time of entry into the phase increases significantly.

In the described method, these disadvantages are eliminated by the fact that a variable correction step is used, which is proportional to the phase error angle. For this, the characteristic moments of modulation of the incoming sequence of telegraph parcels are recorded and compared with the local generator pulses at a pulse frequency of advances K times greater | wiring frequency.

The drawing shows the functional diagram of the device described by cnoi; o6y.

The device consists of three shift registers: the backlog register}, the leading register 2 and the auxiliary register 3. The registers 7. and 2 are connected to the outputs of the phase discriminator 4, to the input 5 of which incoming incoming telegraph parcels arrive. If the incoming parcels are in sync with the local oscillator pulses, the output of which is connected to terminal 6, the boundaries of the received parcels will coincide with the moments of the polarity of the local oscillator.

No. 126519-2 -

corresponding to the characteristic points of received parcels. In this case, pulses arise at the output of the phase discriminator connected to register 1 in the case when there is a lag in the phase of the local generator.

If the local generator is ahead in phase of the incoming parcels, then pulses occur on the output of the phase discriminator connected to register 2.

Under the action of a pulse from a phase discriminator (for example, in the case of a lagging phase of a local generator), the unit is written to all elements of the register /. Under the action of advance pulses applied to terminal 7, units are moved to output 8. Frequency of advance pulses Selected in K, as the wiring frequency is higher. On the other hand, under the action of a local generator pulse, all cores of register 1 are reset to the zero position, except the first. If the phase lag is such that the time between the pulse at the output of the phase discriminator and the pulse

reset / more ..., (here n is the number of cells in the register, / V is the frequency

wiring, KN-frequency of the advancing pulses), then n 8 output pulses will occur, under the action of which the phase generator of the local oscillator will shift.

If fTTr g, then at the output of 8 arises - Impulses addA VA / V

laziness. Thus, the number of addition pulses is proportional to, but the magnitude of the phase mismatch angle and can vary from 1 to. In advance of the phase, the device operates in the same way. Ejection control pulses occur at output 9 using two registers 2 and 5. The control pulses from the outputs enter the reversal counter 10 and then through clamps 11 to the frequency divider of the local oscillator. The accuracy with which the magnitude of the phase mismatch is determined depends on the pulse repetition rate / C- The higher / C, the more accurately the control device operates.

The described method of phasing systems increases the stability of operation and ensures rapid entry into the phase, which is especially beneficial when using synchronous systems in a network of direct connections.

Subject invention

A method of phasing systems with a variable correction step on ferrites with a rectangular hysteresis loop, characterized in that, in order to reduce the time to enter the phase and to automatically set the recording stations in the presence of dominant signals, they form a variable correction step proportional to the angle of phase mismatch by registering shift registers of the characteristic moments of modulation and and pulses of a local generator at a frequency of advancing pulses in / С times higher frequency telegraph va.ni.