SU1145453A1 - Generator of phase-shift keyed signals - Google Patents

Abstract

FORMER OF PHASE-MOBILE SIGNALS, containing a source of carrier frequency signals, serially connected phase manipulator, adder and N-cascade resonant amplifier, as well as a source of manipulative signals, the output of which is connected to the input signal of the manipulation of the phase manipulator and; the input of the first pulse square generator, and the balanced amplitude modulator, the output of which is connected to the second input of the adder, characterized in that, in order to reduce the nonlinear distortion of the output signal, sequentially are entered into it. . A L, are the second second shaper of the rectangular pulses, the input of which is connected to the output of the first shaper of the rectangular pulses, the third, fourth, ..., N-and the shapers of the rectangular pulses, the weight adder, to the inputs of which are connected the outputs of the N shapers of the direct impulses inverter and switch, the control input of which is connected to the output of the modulation signal source, and the output is connected to the modulating signal input of a balanced amplitude modulator, while the output of the weight adder is connected to the input and the inverter and the first input of the switch, the output of the inverter is connected to the second input of the switch, a phase shifter is inserted between the source output of the carrier frequency signal and the manipulated input of the phase shift key, the modulated signal of the balanced amplitude modulator is connected to the output 4 of the SP 4i source of the carrier frequency signal, odd square pulse shapers are FORSP worlds of rectangular CO pulses of positive polarity, and even square shape shapers of positive polarity in negative polarity.

Description

The invention relates to radio engineering and can be used to generate phase-shift keyed, sinusoidal signals in radio communications, radiolocation, radio telemetry, radio control. A shaper of phase-shifted signals is known, which contains a series-connected carrier frequency generator, a phase manipulator, the manipulation signal input of which is connected to the output of the converter unit, information and clock inputs, and an N-cascade resonant amplifier 1. However, in the well-known phase shifter, the nonlinear distortions of the output signal due to transients caused by the phase jumps of the signal on the N-frame resonant amplifier are relatively large. Closest to the proposed phase-shift keying shaper, containing a source of carrier frequency signals, a series-connected phase manipulator, an adder and an N-cascade resonant amplifier, as well as a source of manipulating signals, the output of which is connected to the input-signal and manipulating the phase manipulator and the first shaper input rectangular pulses, a balanced amplitude modulator, the output of which is connected to the second input of the adder, as well as series-connected attenuator and amplitude ny manipulator, whose output is connected to the input of modulating forward. the signal of the balanced amplitude modulator, and the input of the manipulation signal, with the output of the first square-wave former, while the source of the manipulated signal is connected to the input of the manipulated phase signal. The nipulator and the attenuator input, and the source output of the manipulating signal with the modulation signal input of a balanced amplitude modulator 2. However, in the output signal of this phase-shifting generator, the nonlinear distortions caused by transients in the N-cascade resonant amplifier for phase jumps at its entrance. 53 J The purpose of the invention is to reduce non-linear distortion of the output signal. To achieve this goal, a phase shift keying signal generator containing a source of carrier frequency signals, serially connected phase manipulator, adder and N-cascade resonant amplifier, as well as a source of manipulating signals, the output of which is connected to the input signal of the phase manipulator and input the first square pulse generator, and the balanced amplitude modulator, the output of which is connected to the second input of the adder, are introduced in series with the second forms a rectangular impulse rover whose input is connected to the output of the first rectangular impulse generator, the third, fourth, ..., N- and rectangular impulse drivers, a weight adder, to the inputs of which are connected the outputs of N impulse square formers, an inverter and a switch, the control input of which is connected to the output of the source of the modulating signals, and the output to the input of the modulation signal of the balanced a, m-module modulator, while the output of the weight adder is connected to the input of the inverter and the first input of the switch a torus, the inverter output is connected to the second input of the switch, a phase shifter is inserted between the source output of the carrier frequency signal and the input signal of the phase shift keyed signal, the modulated signal input of the balanced amplitude modulator is connected to the output source of the carrier frequency signal, and the odd forward / reverse pulse drivers are formers of rectangular pulses of positive polarity, and even formers of rectangular pulses of negative polarity. FIG. 1 shows a structural electrical circuit of the proposed phase-shift keyed signal generator i in FIG. 2 is a timing diagram of its operation; in FIG. An example of a possible implementation of a phase-gap structural circuitry. The driver of the phase-shifted signals contains a source 1 of carrier frequency signals, a phase shifter 2, a phase manipulator 3, a source 4 of a manipulation signals, a switch 5, the first, second, third, ..., M-drivers 6 6, 6j,, .., 6 , a rectangular impulse adder 7, a balanced amplitude modulator 8, an inverter 9, a weight adder 10, and an H-cascade resonant amplifier 11. The device operates as follows. From source 1 of carrier signals, the signal with amplitude v through phase shifter 2, shifting it by angle v, enters the input of the manipulated signal of phase manipulator 3 (Fig. 2et), and from source 4 of the manipulating signals, the signal arrives at the input of manipulator of the phase manipulator , 3 (Fig. 26). At the output of phase manipulator 3, phase jumps are generated by the required value (2 y). At the same time, the edge of the manipulating signal is used to trigger the first former of 6 rectangular pulses of positive polarity. A second shaper 6 rectangular pulses of negative magnitude is triggered by a cut of this pulse (Fig. 2) Thus, all formers 6, - 6 of rectangular pulses are sequentially launched, and odd formers of rectangular pulses form positive polarity pulses, and even - rectangular pulses of negative polarity. All rectangular pulses have the same duration G and amplitude. To provide compensation for transients in an N-stage resonant amplifier 11 through the interval Nf after the moment of manipulation, the amplitude of each pulse must have a certain value. This is achieved by applying the output pulse of each generator 6, and square rectangular pulses to the corresponding input of the weight adder tO. the inputs of the switch 5 directly and through the inverter 9. The control of the operation of the caster 5, which can be performed, for example, B1 as an analogue analogue 534 and the inverter, is operated from source 4 When the phase manipulator 3 is executed, as shown, for example, in FIG. 3, in the form of two keys 12 and 13, the inverter 14 and the phase shifter 15 to 24, with the open key 12 going to the output of the switch 5, the signals from its first input pass, and with the open key 13, from the second input. The signal from the output of switch 5 (Fig. 2l.) Is fed to the input of the modulation signal of a balanced amplitude manipulator 8, to the input of the modulated module of which a signal is received from the output of source 1 of signals of frequency. The output signals of the balanced amplitude madulator 8 (Fig. 25) and the phase-v of the main manipulator 3 (Fig. 2.e) through the adder 7 are fed to the input of the N-cas-. cadres resonant amplifier 11. As a result of the interaction of these signals, the transient process in the N-stage resonant amplifier 11 is terminated after the time Nf after the moment of phase manipulation. FIG. Figures 2 and b show, respectively, the sonibes of the formation of a phase-shift keyed signal at the output of a K-resonance amplifier, respectively, in the proposed and well-known phase shift keyed signals. The conductivity T, p -rp of the weight adder 10 is determined by the expression (, bp-1 where 24 is the phase jump at the moments of phase manipulation simultaneously with the main phase-modulated signal, the input and output of the phase shifter 2 providing the phase shift of the carrier frequency signal at an angle of 90 are connected respectively to the output of the source 1 of carrier frequency signals

and the manipulated input of the phase shift key 3. This ensures the required phasing between the phase-modulated signal and additional radio pulses at the inputs of the adder 7. As a result of the distortion of the phase-modulated signal at the output of the N-cascade resonant amplifier, they are localized in the Nf interval by compensating for transients in it. By choosing the value of Ntf, which is much shorter than the duration of sending the phase-manipulated signal T, one can significantly reduce the distortion of this signal.

Thus, nonlinear distortion is reduced in the output signal of the proposed phase-shifted signal former.

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Claims (1)

PHASOMANIPULATED SIGNAL DRIVER, comprising a carrier frequency signal source, a phase manipulator, an adder and an N-cascade resonant amplifier connected in series, as well as a manipulator signal source, the output of which is connected to the phase manipulator signal input signal and the input of the first square-wave pulse generator, and a balanced amplitude modulator , the output of which is connected to the second input of the adder, characterized in that, in order to reduce non-linear distortion of the output signal ^, in it the second rectangular pulse shaper, the input of which is connected to the output of the first rectangular pulse shaper, the third, fourth, ..., Nth square pulse shapers, a weight adder, the outputs of which are connected the outputs of N square pulse shapers, an inverter and a switch, are connected in series the control input of which is connected to the output of the source of modulating signals, and the output to the input of the modulation signal of a balanced amplitude modulator, while the output of the weight adder is connected with the inverter input and the first input of the switch, the inverter output is connected to the second input of the switch, a phase shifter is inserted between the output of the carrier frequency signal source and the input of the manipulated phase manipulator signal, the input of the modulated signal of the balanced amplitude modulator is connected to the output of the carrier frequency signal source, while the odd rectangular formers pulses are shapers of rectangular pulses of positive polarity, and even shapers of rectangular pulses are negative tion polarity. 1 145453