SU1046941A1 - Carrier frequency restoring device - Google Patents

Abstract

DEVICE FOR THE RELATIONSHIP chain and digester, post-successively amplified selector of positive impulses N sometimes shaper nktulsov, according to a specially linked amplitude selector of negative imputuses, which is connected to the impulse selector by a positive pulse, and the second, the pulse pulse generator. characterized in that, in order to increase the phase stability of the restored oscillation, a txtgrader is connected to the outputs of the first and second drivers and pulses, the output of which is connected to the input of the smoothing filter, between the output of the quadrature signal of the phase-changing signal in the video frequency and the inputs of both amplitude selectors l (A series of additional low-pass filters are connected in series, a dAmplex amplifier and an adder, the other input of which is connected to the output of the tel. one with 4;

Description

The invention of otHocirrcH to epectrosis and can be used in the system of transmitting ciscrete messages with signals with phase manipulation.

It is known a device CL has been restored & contains the frequency-frequency band containing. Ring-mounted quadrature converter of a phase-shift keyed signal into a video frequency filter, a low-frequency filter and a controlled generator, whose ring is connected to the output of a smoothing filter, attached to an EJbixoay quadrature converter of a manipulated signal into a video signal, after the pattern is drawn, we draw a pattern of a right-hand piece of a quadrature converter of a manipulated signal into a video signal, after the pattern is drawn, we draw a pattern of viper, and we pull the pattern of a quadrature-phase converter of the manipulated signal into a video signal, after the pattern is drawn, we draw a pattern of viper bone in a quadrature-type converter amplifier, successively connected amplitude selector of positive pulses and the first pulse shaper, sequentially connected amplitude selector negative pulses, whose input is connected to an amplitude selector vhdom positive pulse and a second pulse shaper 1.

A disadvantage of the known device is the low phase stability of the restored oscillation.

The purpose of the invention is to increase the phase stability of the restored oscillation.

The goal is achieved by ITO in a device for restoring a carrier frequency, containing a ring-connected quadrature converter of a phase-shift keyed signal to a video frequency filter, a low-pass filter and a controlled oscillator, another input of which is connected to the output of a smoothing filter connected to the output of the quadrature phase shift converter of a manipulated signal into a video frequency filter, consistently connected differentiating circuit and amplifier, successively connected amplitude selector positive pulses and the first pulse shaper, successively connected with the negative pulse lecturer, the input of which is connected to the input of the amplitude positive pulse selector, and the second pulse shaper, are connected to the outputs of the first and second pulse shapers of the integrator, the output of which is connected to the input of the smoothing filter, between the output of the square pulse converter of phase-shifted signal to vipeochas: togny and inputs of both amplitude separators

The pulses are connected in series with an additional low-pass filter, a further amplifier, and an adder, the other input of which is connected to the output of the 5CU amplifier.

. The drawing shows the structural electrical circuit of the device for restoring the carrier frequency in the case of a single input signal.

0; faa manipulation. The device contains a quadrature converter 1 of a phase-shift keyed signal connected to the ring in the form of a & lowpass filter 2 low frequencies (LPF),

5 controlled oscillator 3, the circumference of which is connected to the output of a smoothing filter 4 connected to the output of the quadrature converter 1 of the phase-shift keyed signal in the form of 0 occiput - f: series-connected differentiating circuit 5, amplifier 6, cyiviMaTop 7, to the second input of which through an additional low-pass filter 8 and an additional amplifier 9 connected input

5 differentiating circuit 5, the output of the adder 7 is connected through successively connected amplitude selector 10 positive pulses and the first driver 11 pulses and through Q therefore connected amplitude selector 12 negative pulses

And the second driver 13 pulses to the corresponding inputs of the integrator 14, the output of which is connected to the input of the smoothing filter 4.

In addition, a quadrature converter 1 of a phase-shift keyed signal into a video frequency, for example, synchronous 15 synchronous and phase 16 detectors, an optimal element-by-element processing node 17 and a crucial node 18 connected to the bus 19 clock pulses, a multiplier 20, a phase shifter 21 on p / 2, line 22 delays on the signal strength of the element, and the integrator 14 reversible counter 23 and the converter 24 code - analog.

The device works as follows.

The basis of the device circuit is the phase-locked loop of the PLL, consisting of elements 2,3,16 and 21, which has all the basic properties of a conventional PLL system. The multiplier 20 provides for the removal of manipulation of the output signal of the phase detector 16 binary input manipulation a. To remove the manipulation, the second input multiply 20 receives the generated manipulation voltage generated by the synchronous ctector 15 circuit, uzp 17 for optimal processing of the input signal elements (compacted phpter or integrator with reset) and decisive uzp 18. Because of optimal processing you need to know the moments of commutation of the phase of the signaling signal; external clock impulses from the bus of 19 clock pulses are supplied to the control inputs of nodes 17 and 18. Zarezhka line 22 for the duration of the T element in the signal is necessary to ensure synphasic NIN laws. manipulation at the inputs of the perm drive 20, since in the regeneration circuit (knots 17 and 18) there is a signal hatch for the time T required by the CPU of optimal processing. For further explanation of the operation of the device, we consider the operation of the entire yctw of the device in the beat mode, for which we will suggest that the connections between the LPF 2 and 4 and controlled by the generator 3 are broken. Then, at the output of the synchronous detector 1, a beat voltage is generated with a frequency equal to the frequency difference between the input signal and the generator voltage & torus 3, with the manipulation of the sign corresponding to the input information. At the same time, at the output of the optimum processing unit 17, the signal-to-noise ratio at clock points is maximized. At the output of the node 18, a rectangular voltage is generated, which repeats the law of input signal manipulation with a delay of. m T .. This voltage in the multiplier 20 is used to switch the beat voltage from the output of the phase detector 16. The result of the multiplication (regardless of whether the input voltage of the device is manipulated in phase or not) resembles a sinusoid, the phase of which is switched to P each half the difference frequency period. This voltage has one very steep front, the sign of the slope of which is determined by the sign of the dry frequency. These steep fronts are used in a wider grip range; Differential circuit 5 produces pulses, the polarity of which is determined by the sign of frequency derangement. If pulses are skipped over the amplitude selector 10 and 12 pulses of the corresponding polarity, and then fed to integrator 14, then a control signal is generated at the output of the latter, the value of which increases with the number of pulses of one sign (from the output of one amplitude selector). This control signal passes through a smoothing filter 4 and adjusts generator 3, i.e., reduces the difference frequency. This fur. The adjustment level operates with such large frequency detuning, while the usual capture mechanism of the Phage1H test system is not yet effective. After reaching existence in the circuit, due to the divergence of the natural frequencies of the input signal and the controlled oscillator 3, the ideal phase relations can be violated, at which the phase transition between the voltages at the inputs of the phase detector 16 is + P / 2. In this case: in the voltage at the output of the multiplier 2O, a constant component appears, which through an additional low-pass filter 8 and amplifier 9 will start on the adder 7, which is equivalent to offset of the thresholds of the amplitude selectors 10 and 12. In the steady state through the amplitude selectors pass only select noise. When the thresholds are shifted, the average frequencies of the noise emissions passing through the amplitude selectors 10 and 12 become unequal, which leads to the appearance of an additional corrective delay at the output of the integrator 14, i.e., the phase-shift in the synchronization mode is corrected. One of the possible implementations of the integrator 14 (discrete integrator) is shown in the drawing. The integrator is designed as a combination of a reversible counter 23. And a converter 24 code -. The shapers 11 and 13 pulses normalize the pulses applied to the counter 23 in amplitude and duration. The counter dries the number of pulses, and the converter 24 converts this number into the form of a control voltage. Realizing the quadrature converter 1 of the phase-matched signal into the extra-frequency signal may differ from that shown in the drawing, which is determined by the multiplicity of the input phase signal, the appropriateness of removing the signal on the radio signal of the video signal, as well as the requirements for operation of the device for certain signal-to-noise ratios. The positive effect of using the pre-invented invention is that in the established mode noise emissions pass through the ampitituated separators, which lead to a final control signal, an integrating control signal, an integrator, and a phase-wise integrator and integrate the control signal to the integrator and integrate the control signal and integrate the control signal and integrate the control signal in the final control signal and integrate the control signal and integrate the control signal to the integrator and integrate the control signal into the final control signal and integrate the control signal to the integrator and integrate the control signal into the final control signal and integrate the control signal in the final control signal and integrate the control signal and integrate the control signal and integrate the control signal and integrate the control signal and integrate the control signal and integrate the control signal and integrate the control signal to the integrator and integrate the control signal in the final control signal. spikes.

Claims (1)

^d DEVICE FOR RESTORING THE CARRIER FREQUENCY, containing a quadrature transducer of a phase-shifted signal into a vice-frequency filter connected to a ring, a low-pass filter and a controllable generator, the other input of which is connected to the output of a smoothing filter, connected to the output of a quadrature transformer of a phaeomanipulated signal to a vice-frequency circuit, and connected in series to ueli — shadow, series-connected amplitude selector of positive pulses and the first driver pulses, connected in series with the amplitude selector of negative pulses, the input of which is connected to the input of the amplitude selector of positive pulses] and a second pulse shaper, characterized in that, in order to increase the phase stability of the restored oscillation, an integrator is connected to the outputs of the first and second pulse shapers, the output of which is connected to the input of the smoothing filter, between the output of the quadrature converter of the phase-shifted signal to vice-frequency and the input ”- С <о mi of both amp pulse selectors of impulses are included sequentially an effective low-pass filter, an additional amplifier and an adder, the other input of which is connected to the output of the amplifier.