SU752751A1 - Radio-frequency pulse shaper - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF RADIO IMPULSES

one

The invention relates to a signal transmission technique and can be used in radio transmitting devices.

A device for generating a frequency-manipulated signal is known, consisting of two quartz oscillators, two electronic keys, a control trigger, a delay element, a front driver, containing a differentiating circuit, a limiter on the top, a bottom limiter, an inverter and an adder, a pulse extender, an additional key and frequency divider TL,

However, when transmitting the original oscillations, the output signal of the device consists of segments of radiated oscillations separated by a pause, which leads to the expansion of the radiated spectrum.

It is also known a device for (radio pulses, containing a modulator, an integrator connected in series, and an adjustable amplifier; a variable amplifier contained in series, connected in series

a generator, a high-frequency amplifier, a filter, a power amplifier, the output of which is the output of an adjustable amplifier, and a serially connected communication modulator coupling capacitor, the output of which is connected to the input of the power amplifier, and the input of a reactive modulator is the input of an adjustable amplifier 2

to

The disadvantage of the device is that in some types of modulus w, for example, Lree PWM-FM, when the duration of the radio pulses changes, the above (| radio control. Radio pulse,

The ts having a fixed constant integrator time leads either to the appearance of spurious amplitude modulation or to an increase in the mutual influence of the channels, i.e. the accuracy of the device deteriorates and the radiated spectrum expands.

Claims (2)

The purpose of the invention is to reduce the parasitic amplitude modulation of the radiated spectrum of the radio wavelengths of the antenna. The goal is achieved by the fact that a device for shaping radio pulses, containing a modulator, a sequentially connected integrator and an adjustable amplifier, a channel separation unit, two PWM converters analogue of PWM, two coincident blocks, an adder, a limiter, a synchronizer, and a first modulator output connected to the synchronizer input, the first and second inputs of which are connected respectively to the first synchronization inputs of the PWM-analog-PWM converters, the second modulator output is connected with the input of the channel separation unit, the first and second outputs of which are connected respectively to the BTopbiMK inputs of the 1converter} of the PWM analog-W), analog and pulse output of the PWM analog-CHIM converters connected to the inputs of the matching blocks, the outputs of which are connected to the inputs of the adder, with This output of the adder is connected to the first input of the integrator, and through the amplifier-limiter to the second input of the integrator, and made controllable, the output of the integrator is connected to the input of the controller of the adjustable amplifier. FIG. 1 is a block diagram of a device for shaping your radio pulses in FIG. 2, - voltage diagrams. A device for shaping your radio pulses contains a modulator 1, an integrator 2 connected in series, and an adjustable amplifier 3. A channel separation unit 4, two PWM-analogue-PWM converters 5 and 7 coincidence units 8 and 8 are entered, a limiter amplifier adder; U, synchronizer 11, while the first output of the modulator 1 is connected to the input of the synchronizer 11, the first and second outputs of which are connected respectively to the first clock inputs of converters 5 and 6 of the PWM-analog-PWM; The second output of the modulator is connected to the input of a channel separation unit 4, the first and second outputs of which are connected respectively to the second inputs of converters 5 and 6 PWM-analog-PWM connected to the inputs of blocks 7 and 8 coincidence, the outputs of which are connected to the inputs of adder 9, with In this case, the output of the adder 9 is connected to the first input of the integrator 2 and through the amplifier — the limiter Yu — to the 14th second input of the integrator 2, made controlled, the output of the integrator 2 is connected to the input of the control} w of the adjustable amplifier 3. The device works way. From the output of the modulator 1, the signal (Fig. 2a) is fed to the synchronizer 11 and the channel separation unit 4. The synchronizer 11 generates sync pulses (Fig. 26), synchronizing the operation of converters M and 6 PWM-analog-PWM. The channel separation unit 4 divides the input signal into even and odd channels (Fig. 2c). In the corresponding PWM analogue-PWM converter, the input duration pulses are converted to the corresponding voltage Vj (which is divided in a resistive divider in half and then converted into a pulse with a duration (Fig. 2e, e). This division and pre-positioning are necessary in order for at wider a pulse greater than yf when integrated, the pulse did not fall into the adjacent channel. From the outputs of the corresponding PWM-Analog-SH11M converter, analog and pulse signals are sent to the corresponding inputs of the coincidence unit, from the output The pulses of duration and amplitude V /} are fed to the inputs of the adder 9. Pulse width conversion and analog voltage are necessary to give the integrator 2 the necessary correction of the slope of the integrated 1 1, depending on the pulse width, which completely removes the parasitic amplitude modulation of the output pulse. From the output of the adder 9, the pulses (Fig. 2g) go to integrator 2, and the first input of the integration slope correction is directly to the second control input, through the limiting amplifier 10. From the output integrator 2 pulses (FIG. 2h) are fed to the control reactive modulator of the adjustable amplifier 3, from the output of which the radio pulses, which have an optimum spectrum due to the envelope forming, enter the radial path (Fig. 2 and). Thus, the proposed device for generating radio pulses allows optimizing the output signal spectrum as the radio pulse duration varies. In this case, the mutual influence of the channels decreases by 20S &, by reducing the parasitic amplitude modulation, the accuracy and reliability of the transmitted information is increased. Formula and Covers A device for generating radio pulses containing a modulator, sequentially connected integrator and a regulable amplifier, characterized in that, in order to reduce the parasitic amplitude modulation of the emitted spectrum of radio pulses when their duration is changed, a channel separation unit is inserted into it , two converters PWM-analog-PWM, two blocks of coincidence, adder, amplifier - limiter, synchronizer, with the first modulator output connected to the synchronizer input, the first and second inputs to The first is connected respectively to the first inputs S1 synchronization of converters PWM-analog-Sh11M, 7 16 second output of the modulator connected to the input of the partitioned channels unit, the first and second outputs of which are connected respectively to the second inputs of converters Ш1-лМ-analog-Ш1ЬМ analog and pulse outputs PWM analogue-Ш11М converters are connected to the inputs of the matching blocks, the outputs of which are connected to the inputs of the adder, the output of the sucker is connected to the first input of the 1-integrator, and through the limit of the 5-chip with BTopbtt-i. -gora, vsholnennogo controllable, an integrator connected to the input upravle1sh controlled amplifier. Sources of Ygformations, taken into account during the examination 1. USSR author inscription № 467446, 7Ш. S 03 3/00, 1976. 2.ABTopcjcoe svdedelstvo USSR № 599327, class, and OZ B 7/12, 1978 (prototype), fug. er; J & -. to -