SU1416867A1 - Device for transmitting radiotelemetering signals - Google Patents

Abstract

The invention relates to a measurement technique and can be used to continuously and simultaneously control a large number of different parameters when examining machines in field conditions. The goal is to increase the noise immunity of the device without increasing the radio emission band. The device contains a clock oscillator 1, a distributor 2, a shaper 3 supply pulses, amplifiers 4 pulses, switch 5, measuring bridges 6, element OR 7, single-oscillator 8 and 9, first adder 10, address counter 11, block 12 of memory, radio 13, decoder 14 commands, first digital-to-analog converter 15, analog-to-digital converter 16, code converter 17, consisting of keys 17.1-17.Q, second digital-analog converter 18, second adder 19, low frequency filter 20, modulator 21, radio transmitter 22. Interference interference the stability of the device is achieved by introducing new nodes and links that carry out pulse amplitude modulation and frequency moduli, and the radio emission band is limited by an analog-digital converter with subsequent conversion of pulse modulation to modulation pulse amplitude moduli filtration and harmonics, high-frequency signal. 2 pcs. 1 with S (L

Description

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The invention relates to a measurement technique that can be used for HeijpepbiBHoro and the simultaneous control of a large number of different parameters in the study of machines under field conditions.

The purpose of the invention is to increase the noise immunity of the device without increasing the radio emission band.

FIG. 1 shows a block diagram of a device for transmitting radiotelemetry information} in FIG. 2 are timing diagrams explaining its operation.

 The device contains a clock generator 1, a valve 2, a generator; a rotator 3, amplifiers 4.1-4. To a pulse; a power supply (according to the number of measured pairs of meters), a switch 5, measuring I bridges 6, 1-6. To the element OR 7, first: and the second one-shot 8 and 9, the first adder 10, the address counter 11, the memory block 12, the radio receiver 13, the decoder

14, digital-to-analog converter

15, analog-to-digital converter

16, code converter 17, second digital-to-analog converter 18, second adder 19, low filter 20

emissions caused by stray and capacitance measuring cables,

The signal (Fig. 2a) is fed to the first input of the first adder 10, Block 16 converts the signals from the sensors into a parallel binary code.

The device for transmitting radio telemetry information operates in two modes: Balancing and Measurement. The modes are set by the operator at the receiving device. 1To receive a radio link to the radio receiver 13, the command code for the specified mode then goes to the decoder 14 commands. From the last signal, the Balancing command sends the memory block 12 to the write mode, and the measurement command signal to the read mode. In the Balancing mode, digital information about the initial imbalance of the sensors of the respective channels is recorded in block 12.

In the Measurement mode, from block 12, Dafro information about the initial unbalance is read out and fed to the first digital-to-analog converter 15, which generates an analog signal

frequency modulator 21, radio transmitter 30 for compensation of the initial unbalance.

22 (the converter 17 of the code contains the keys 17.1-17 .Q,; in parallel), the driver of the 23 clock pulses.

The device works as follows.

The pulses from the clock generator 1 are fed to the start of the driver 3 power supply pulses and on the distributions45

body 2. Pulses formed by long-Q in parallel-serial coding through distributor 2 are sent to the element SHSh 7 and power supply pulse amplifiers of measuring bridges 6.1-6. K, C amplifiers 4.1-4, K

 power pulses arrive at measuring bridges 6.1-6. K, Signals times ™

 the balance of measuring bridges 6.1-6, K in the form of periodic sequences of amplitude-modulated pulses are fed to the switch 5 signals. Strobe pulses for switch 5 come from the second one-oscillator 9, which is triggered by pulses from the element OR 7 through the first one-oscillator B. The temporary position of the strobe pulses in the middle of the unbalance pulses ensures that the middle part of the unbalance pulses is free. from

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(Fig, 2 g). Such a conversion is achieved with the help of keys 17.1-17.Q. From block 16, the first keys 17.1 receive mpad m bits, and after the keys 17.0, the old key m bits of the parallel binary n-bit code, divided into Qm-bit Single code groups. The keys 17.1-17.Q open with sequentially in time control signals from the distributor 2 (FIG. 2B), with the consecutively forming HF code groups, which are removed from the combined H-bit output of the keys 17, 17 , Q, The converted code is fed to the second digital-to-analog converter 18, which forms Q sequential pulses, the amplitude of which corresponds to the value of t-times5

coming to the second input of the first adder 10,

In the first adder, a signal is generated that contains only the measuring information that goes to block 16. From the output of block 16, information in the parallel binary code (FIG 2 b) goes to the code converter 17, which converts the parallel code

45

Q in parallel-serial code

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(Fig, 2 g). Such a conversion is achieved using the keys 17.1-17.Q. From block 16, the first keys 17.1 receive mp1 m bits, and the last keys 17.0 receive the old m bits of the parallel binary n-bit code, divided into Qm-bit code groups. The keys 17.1-17.Q are opened successively in time by the control signals from the distributor 2 (FIG. 2b), in which consecutively generated code bits are removed from the combined H-bit output of the keys 17.1-17, Q, The converted code is fed to the second digital-to-analog converter 18, which forms Q consecutive pulses, the amplitude of which corresponds to the value of t times

Row code. The converter 17 code and block 18 form, thus, a signal, () with a lower code base (FIG. 2a). The base of the code is 2.

Such a conversion allows to reduce the frequency of the information signal arriving at the modulator 21 as compared with the option if the modulator 21 from block 16 received a serial binary code having a base 2 (the CIM signal of figure 2.g).

The signal KAIN arrives at the first input of the second adder 19, at its second input a code group of clock pulses comes from the driver 23 clock pulses. From the output of the second adder 19, the sync group and the CLIM signal are fed to a low-pass filter 20, which passes only the first harmonic of the signals, thereby further reducing the baseband frequency (FIG. 2e). From the output of the filter 20, the signal arrives at the modulator 21, which forms the frequency-modulated signal KAIM-FM, which provides increased noise immunity of the device. The signal CAIM-FM enters the radio transmitter 22,

Figure 2 shows, as an example, signal plots for a nine-bit () parallel binary code generated by block 16 (Figure 2b. The code converter 17 forms a three-bit () parallel-serial code (Figure 2d). Consisting of three consecutive ones code groups (), the second digital-to-analog converter. 18 generates a CLIM signal (fig.2d) with a code base of 2 8.

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This technical solution to the transmitting input is connected to the output of the second giving device, which allows the use of a single vibrator; the outputs are analog-to-digital, with a radio telemetry installation in locations with increased radio interference.

converter is combined into groups and connected to the information input of the memory block, the outputs of each

Claims (1)

Invention Formula A device for transmitting radio telemetry signals containing a clock oscillator, the output of which is connected to the first input of the distributor directly and through the driver of supply pulses — to the second input of the distributor; amplifiers of supply pulses according to the number of measured 0 Q s 5 o 0 five parameters whose inputs are combined with the same inputs of the OR element and the switch and are connected to the nominal outputs of the distributor, the first and second outputs of each power supply pulse amplifier are connected to the first and second inputs of the same measuring bridge, the first output of each measuring bridge of the same name is connected to the second output is connected to the same signal inputs of the switch, the output of the element OR is connected through the first and second single-oscillators connected in series to the gate input the switch, the output of which is connected to the first input of the first adder, the second input of which is connected to the output of the first digital-to-analog converter, the address counter, the output of which is connected to the address input of the memory unit, the radio receiver whose input is connected to the receiving antenna, the code is connected to the input of the command decoder, the output of which is connected to the information input of the memory unit, the driver of the sync pulses, the input of which is connected to the corresponding code of the distributor, the radio transmitter, the output of which is connected to the transducer A second antenna, characterized in that, in order to increase the noise immunity of the device without increasing the radio emission band, a second digital-to-analog converter, an analog-to-digital converter, a second adder, a low-pass filter, a modulator, npfe-, a code generator, entered on the keys, the information input of the analog-digital converter is connected to the output of the first adder, the control s is connected to the output of the second one-oscillator, the outputs of the analog-to-digital converter is combined into groups and connected to the information input of the memory block, the outputs of each 50 groups are connected to the information inputs of the code converter's keys of the same name, the control inputs of the code converter keys are connected to the corresponding outputs of the limiter, the output of all the keys of the code converter are combined and connected to the inputs of the second digital-to-analog converter, whose output is connected to the first input of the second an adder, the second input of which is connected to the output of the sync pulse generator, the output of the Second cyMMafopa through a series connected low hour filter that . and the modulator is connected to the input of the radio transmitter, the output of the memory unit is connected to the input of the first digital-to-analog converter, the input of the address counter is connected to the output of the OR element. cf3ue.2