SU1099408A1 - Device for forming frequency-shift keyed signals - Google Patents

Abstract

A DEVICE FOR THE FORMATION OF FREQUENCY-MANIPULATED SIGNALS containing the first generator, the output of which is connected to the inputs of the first phase shifter and the first balanced modulator, connected in series by a trigger and the first driver of the pulses, as well as the second generator, the second balanced modulator, an adder and three keys that distinguish so that, in order to improve the accuracy of the formation, a second one is introduced into it. the phase shifter, the second and third pulse formers, the rvrf-r-ts-v generator (P ii UVi li.ri-.vi:form voltage, the threshold unit and two amplifiers, the output of the first phase shifter through serially connected second pulse shaper, the sawtooth generator, the first key and the threshold unit are connected to the trigger input, and through the second switch to the first input of the adder, the second, third and fourth inputs of which are connected respectively to the output of the first balanced modulator through the first amplifier, with the output the second generator and the second amplifier and the output of the second generator through the second phase shifter and the third key connected in series through the second generator and the second phase shifter through the third pulse generator connected to the second input of the first key, the second input of the second key connected to the input of the first driver pulses, the output of which is connected; ox to the second inputs of the first and second balanced modulators, and the second output of the flip-flop is connected to the second one about the input tert his key. EO

Description

The invention relates to radio engineering and can be used in devices for generating frequency-manipulated sinusoidal signals. A device for generating frequency-manipulated signals comprising a discrete signal sensor connected in series, a frequency-controlled signal generator, and a load block Cl 3 is known. A disadvantage of the device is the low stability of the middle frequency due to the difficulty of providing high stability of the tunable frequency-controlled signal generator, and also low shaping accuracy due to transients in the load block caused by frequency jumps at its input. The closest technical solution to the invention is a device for generating frequency-manipulated signals, comprising a first generator, the output of which is connected to the inputs of the first phase shifter and the first balanced modulator., Successively connected trigger and first pulse shaper as well as the second generator , the second balanced modulator, the adder and the three keys C 2. A disadvantage of the known device is the low accuracy of the formation of the frequency-manipulated signals, due to the fact that tviem frequency jumps occur transients distort the law of varying the frequency. The aim of the invention is to improve the accuracy of the formation. The goal is achieved by the fact that the device for generating frequency-manipulated signals, containing the first generator, the output of which is connected to the inputs of the first phase shifter and the first balanced modulator, connected in series with a trigger and the first pulse shaper, as well as the second generator, second balance modulator, adder and three switches, a second phase shifter, a second and a third pulse shaper, a sawtooth generator, a threshold unit, and two amplifiers, the output of the first phase shifter The gateway is connected in series to the second pulse former, sawtooth generator, the first key and the threshold unit are connected to the trigger input, and through the second key to the first input of the adder, the second, third and fourth inputs of which are connected respectively to the output of the first balanced modulator via the first amplifier, with the output of the second generator through the second balanced modulator and the second amplifier connected in series, and with the output of the second generator through the series soy) Zennye second phase switch The transmitter and the third key, the output of the second phase shifter through the third driver, the pulses are connected to the second input of the first key, the second input of the second key is connected to the input of the first pulse driver, the output of which is connected to the second inputs of the first and second balanced modulators, and the second trigger output is connected to the second input of the third key. Fig. 1 is an electrical functional diagram of a device for generating frequency-manipulated signals; Fig. 2 - time diagrams that show his work. The device for generating frequency-manipulated signals contains the first generator 1, the first phase shifter 2, the first key 3, the adder 4, the first balanced modulator 5, the first amplifier 6, the second generator 7, the second balanced modulator 8, the first driver 9 pulses, the second amplifier 10, the second phase shifter And, the second key 12, the third key 13, the second pulse shaper 17, the sawtooth generator 15, the third pulse shaper 16, the threshold unit 17 and the trigger 18. The device operates as follows. Part of the voltages applied by the first 1 and second 7 generators from the first 2 and second 11 phasers, respectively, arrive at the inputs of the second 14 and third 16 formers, respectively, which produce positive polarity pulses, the duration of which is much less than the frequency voltage period Shu of the first generator 1, at the moments of transition from negative to positive values of the voltages at their inputs (Fig. 2o (, 5). The leading edges of the output pulses of the second pulse generator 14 pulse ( ng. 2c4) a sawtooth voltage generator 15 is started, absorbing sawtooth pulses with a duration of 2 J // tA 2 (Fig. 2c), 5 At the moment of the appearance of a pulse at the output of the third pulse shaper. 16 (Fig. 2 $) opens the first key 3 This gates the sawtooth voltage and memorizes this voltage (Fig. 2). In this way, the phase difference of the output voltages of the first 2 and second 11 phase shifters is converted into a constant voltage at the output ts first key 3. If the phase of the output voltage The second phase shifter 11 lags behind the phase of the output voltage of the first phase shifter 2 at an angle of 2U, then the output voltage of the first 20 key 3 is equal to the trigger threshold threshold block 17 (Fig. 2i dashed line), at the output of which appears a short-term impulse of positive polarity pr-ps of a rectangular shape (Fig. 2i), which enters the trigger input 18. If at this moment or in front of it the voltage at the information input of the trigger 18 turned Q 1 (Fig. 2e), then at the first output of the trigger 18, a positive polarity pulse appears (Fig. 2g, moment T), opening the second key 12. Under the action of the leading edge of this pulse, the first driver 9 of the pulses has a rectangular pulse position polarity duration f (Fig. 2i), which controls the operation of the first 5 and second 8 balanced modulators, by means of which two additional radio pulses with frequencies o, and, and) are formed, respectively, leading in 084 phase voltage on the first inputs of keys as required by the conditions of synchronization, at angles H and V, respectively. These amplified radio pulses, after amplification, are summed with the voltage frequency uj and arrive at the output of the device, and the distortions of the law of frequency variations at the output of the device are localized at the interval t 6 Gt (Fig. 2k). If the voltage ria to the information input of the trigger 18 corresponds to a logical O (Fig. 2 €), then when a pulse appears at its input (Fig. 2J, time T + 1), a pulse of positive polarity appears at its second output (Fig. 2e), the opening third key 13. In this case, the second key 12 is closed, and under the action of the falling edge of the pulse at the first output of the trigger 18, the first driver 9 of the pulses generates a pulse of negative polarity (Fig. 2i), under the action of which additional radio pulses mi sync pr acquire an additional phase shift of 180 °. The transient at the output of the load block is localized on the interval T + T + tj (Fig. 2k). By choosing a T value much shorter than the duration of the transmission, one can significantly reduce the distortion of the FM signal. The technical and economic effect of the proposal consists in increasing the accuracy of shaping the frequency-manipulated signal by reducing the duration of the transient processes at the output of the device, as a result of which the reliability of information transmission in radio communications, radar, radio telemetry and radio control is increased.

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Claims (1)

DEVICE FOR FORMING FREQUENCY-MANIPULATED SIGNALS, containing the first generator, the output of which is connected to the inputs of the first phase shifter and the first balanced modulator, serially connected trigger and the first pulse shaper, as well as the second generator, the second balanced modulator, adder and three keys, distinguishing from I am that in order to increase the accuracy of formation, a second one has been introduced into it. phase shifter, second and third pulse shapers, sawtooth generator, threshold block and two amplifiers, and the output of the first phase shifter through series-connected second pulse shaper, sawtooth generator, first key and threshold block are connected to the trigger input, and through the second key to the first input of the adder, the second, third and fourth inputs of which are connected respectively with the output of the first balanced modulator through the first amplifier, with the output of the second generator through the second phase shifter is connected to the second input of the first key, the second input of the second key is connected to the input of the first pulse shaper, the output of which is connected to the second inputs of the first and second balanced modulators, and the second trigger output connected to the second input of the third key. S.U (I) 1099408