SU1702328A1 - Radio signal simulator - Google Patents

Abstract

The invention relates to automation and can be used to train radio equipment operators. The purpose of the invention is to provide a change in the shape of the simulated signals. The radio signal simulator contains a master oscillator 1, a driver of 2 time diagrams, a converter of 3 pulse waveforms, including a phase modulator 11, a digital-to-analog converter 12 and a driver for envelope codes 13, a filter 4, an interface block 5, a carrier frequency generator 6, a decoder 7, a register 8, a key block 9 and an adder 10. The goal is achieved by performing a pulse waveform converter in the form of a phase modulator, a digital-analogue converter, and an envelope code generator that allows It is possible, by changing only the codes of numbers corresponding to the envelope of the formed signal, to change the shape of the simulated signal. 3 il.

Description

-xi about

Yu

CJ

Yu

00

Fm.1

The invention relates to automation and can be used to train radio equipment operators and to reproduce radio signals under laboratory conditions.

The purpose of the invention is to provide a change in the shape of the simulated signals.

Figure 1 shows the structural electrical circuit of the proposed simulator; Fig. 2, 3 shows the waveforms when using different types of interpolation and an example of the shape of the envelope of a radio pulse.

The simulator contains a master oscillator 1, a shaper 2 timing diagrams, a converter 3 of pulse waveforms, a filter 4, a conjugation block 5, a carrier frequency generator 6, a decoder 7, a register 8, a key block 9, an adder 10, and a converter 3 turns on a modulator 11 phase, digital-to-analog converter (D / A) 12 and shaper 13 envelope codes.

The simulator works as follows.

The signal of the master oscillator 1 is supplied to the driver 2 time diagrams. From the output of the latter to the converter 3, pulses are applied, the order of which corresponds to the time diagram, i.e. order of the pulses of the simulated signal.

When the next pulse arrives from the imaging unit 2 to the transducer 3, the latter begins to form the leading edge of the simulated radio pulse signal, the shape of the leading edge is determined by the imaging unit 13, and the carrier frequency is determined by the signal of the carrier frequency generator 6 supplied to the modulator 11 directly and serially connected the decoder 7, register 8, block 9 keys, the adder 10 and the DAC 12. The last chain of functional units provides for the formation of a periodic pulse signal, respectively of a sinusoidal radio pulse signal with an approximate step interpolation of a sinusoidal signal, in each half-period $ 1, 2b). As is known, this interpolation provides several (4-5) times better ratio of useful and side high-frequency components in the signal being generated than i the case of the simplest single-stage signal (Fig. 2a). The pulse signal thus generated is fed to the output of the interface 5 and the filter 4, which attenuates the side high-frequency components.

The operation of the functional units of the imaging unit 13 of the envelope codes, the DAC 12 and the phase modulator 11 is as follows.

When the next pulse

(FIG. 3a) from the former 2 timing charts to the inverter 3 it is fed to the envelope former 13. At the outputs of the latter, a sequence of codes of numbers corresponding to the sequence of variable instantaneous values of the envelope level (Fig. 36) of the generated radio pulse signal begins to form. They are submitted for informational purposes.

5 inputs of register bits 8; The control input of register 8 from generator 6 is supplied with a sequence of pulses corresponding to the sequence of moments of instantaneous values

0 envelope. Codes arriving at the information inputs of the register 8 at the time of receipt from the generator 6 to the control input are recorded in the bits of the register 8. The code fixed in the bits of the register 8 page 8 is sent to the key block 9. The signals to the control inputs of which come from the decoder 7 Controls provide step interpolation of the sinusoidal waveform.

0 With step interpolation, the instantaneous value of the signal is not represented as a continuously changing function, but as several discrete levels, for example, as levels of 0.25, 0.5,

5 0.751 from amplitude value.

In the simplest case, the interpolation is carried out by two levels of 0.5 (Fig. 26, c) and 1 (Fig. 26), in the form of more complex three, four, etc. Moreover, the assignment of levels can be performed by various more or less complex methods.

When using interpolation levels different from the original by 2.4 and 8 times, the values can be obtained from the initial value given by the code of the current value of the envelope levels by simply shifting the binary code by 1.2.3 bits, respectively. In this case, the code shift is implemented using a block of 9 keys on

0 logical elements And when the control signals are received from the decoder 7. From the 9 keys block, the codes of the instant signal numbers shifted or converted by interpolation are fed through adder 10 to the DAC 12. Adder 10 (depending on the adopted law, the interpol or) provides the transfer of number codes with the ratio of 1/4: 1 / 2,1 type from the output of the block of 9 keys to the bits of the DAC register 12 directly without

additional transformation, or with an arithmetic transformation, i.e. with the formation of some interpolated signal values by summing the code values from the outputs of the 9-key block. In this case, the adder 10 must contain an arithmetic summing device.

Thus, the envelope codes are converted into a series of codes of numbers corresponding to a series of consecutive instantaneous values of a radio pulse signal with step interpolation of a sinusoidal high frequency component. These codes from adder 10 are fed to a DAC 12, where the simulated signal is generated. With the help of the modulator 11, the change - modulation of the phase of the signal according to a given law, determined by the control signal coming from the carrier frequency generator 6, is provided. For example, the most commonly used case is carrier phase change on. 180 °, i.e. using two phase values 0 and 180 °,

The signal generated by the DAC 12 and the modulator 11 is fed through the filter 4 and the interface 5 to the output of the simulator.

Claims (1)

Invention Formula A radio signal simulator containing a series-connected master oscillator, a time plotter, a pulse waveform converter, a filter and an interface block whose output is the simulator's output, a carrier frequency generator whose input is connected to the master oscillator output and the second one the input of the transducer waveform signals, serially connected decoder, register, key block and adder, the output of which 0 is connected to the third input of the converter of the pulse waveform, the inputs of the decoder are connected to the corresponding outputs of the carrier frequency generator, about that. that, in order to provide a change in the shape of the simulated signals, the pulse waveform converter contains an envelope code generator, a digital-to-analog converter and a phase modulator, with the outputs 0 the envelope code generator is connected to the additional inputs of the register, the output of the digital-to-analog converter is connected to the first input of the phase modulator, the second input of which is the second 5 input transducer waveform signals, the first and third inputs and the output of which are respectively the input of the envelope codes, input to digital to analog converter and 0 is the output of the phase modulator, and the corresponding outputs of the decoder are connected to the control inputs of the key. / and AT