SU1250853A1 - Transmitting device of radiotelemetric installation - Google Patents

Abstract

The invention is intended for remote measurements and can be used for testing various techniques. The purpose of the invention, an increase in the accuracy of the device, is achieved by automatically balancing the measuring bridges, which makes it possible to reduce the measurement error. For this, four single-vibrator 13, 14, 24 and 26, four switches 10, 12, 17 and 21, the address counter 20, the element OR 11, the command receiver 23, the command decoder 22, the operational memory 18 , trigger 25, serial approximation register 19, digital-to-analog converter 16 and adder 15. The drawing shows a clock generator 1, a distributor 2, a driver of 3 pulses, amplifiers 4.1-4.К, where K is the number of measured parameters, measuring bridges 6.1 - 6 .K, radio transmitter 7, modulator 8, driver 9 clock pulses. The automatic balancing provided in the device significantly improves the accuracy of information transmitted by the device. 2 Il. (L Yu S71 O 00 sd with

Description

The invention is intended for remote measurements and can be used for testing various techniques.

The aim of the invention is to improve the accuracy achieved by regularly balancing the measuring bridges, which reduces the measurement error.

FIG. 1 shows a block diagram of the transferee, its radio telemetry devices; in fig. 2 - time diagrams, as shown, his work.

The device contains a clock generator 1, the output is connected to the first input of the distributor 2 directly, and to the second through the driver 3 supply pulses, K amplifiers 4.1-4. To the power pulses, (where K is the number of measured parameters), the inputs of which are connected to - demanding, with their outputs of the pulse distributor and controlling the inputs of the switch 5, and the outputs with the first diagonal of measuring bridges 6.1-6.K, the first output of the second diagonal of which is connected to the common bus, the second with the signal inputs of the switch 5, the radio transmitter 7, The first input of which is connected to the output of the modulator 8, and the second through the driver 9 sync pulses with the corresponding output of the distributor 2, To control the inputs of the switch 10 is connected to the inputs of amplifiers 4.1-4. To the inputs of the element OR 11, the output of which is connected to the first input of the switch 12 and through serially connected one-shot 13 and 14 - with the gate inputs of the modulator 8 and the switch 5, the output connected to the first input of the adder 15, the output of which

pogo connected to the signal input of the module -35, this mode goes on to the decoder

torus 8, and the second input is connected to the output of 22 commands.

digital-to-analog converter (DAC) In balancing mode,

16, the code inputs of which are connected to you compensation of the initial unbalanced signals40

switch 17, the first code inputs of which are connected to the outputs of the operational storage node (RAM) 18, and the second - with the code outputs of the register of successive approximations (RPP) 19 and the information inputs of the RAM 18, the address inputs of which are connected to the output of the counter 20 address and address inputs 45 of the switch 10, the output connected to the second input of the switch 12, the control input of which is connected to the control inputs of the operative storage node 18, the switch 17, the switchboard switch 19, the switch 21 and the output of the decoder 22 commands, input connected to the output of the command receiver 23, the input of the counter 20 is connected to the output of the switch 21, the first input of which is connected to the control output of the control panel

There are two measuring bridge bridges, which are periodic sequences of pulses whose amplitudes do not vary with time (Fig. 26).

The control signal from the decoder 22 commands to the inputs of the switches 12, 17, 21, RPP 19 and RAM 18.

Balancing starts from the first channel. The address counter 20 in its initial state provides to the switch 10 and RAM 18 the address of the first channel. Only the first channel impulses pass through the switch 10 switchboard 2. These pulses through the switch 12 are fed to the launch of the one-shot 24 and 26, as well as to the RPF 19 and RAM 18 as clock pulses.

A single vibrator 24 generates pulses

19, and the second input — with a clock start input 55 (FIG. 2e) of the modulator 8, a gate of the modulator 8 and through a single-shot 24 which input is also fed to the output of the switch 12 and the clock pulses from the output of the one-shot 14, and

the inputs of RAM 18, RPP 19, with the first entrance

signal input through the adder 15 - stro

trigger 25 directly, and through a single vibrator 26 - with the second input of the trigger 25, the third input of which is connected to the output of the modulator 8.

The device works as follows.

The pulses from the clock generator 1 are sent to start the driver 3 supply pulses and to the distributor 2. The generated pulses from the generator 3 (Fig. 2a) through the distributor 2 arrive at the element OR 11 switch 10 and amplifiers 4.1-4. To the power pulses of the measuring bridges 6.1- 6.K- From the amplifiers 4.1-4. To the power pulses arrive at the measuring bridges 6.1-6.K. The unbalance signals (Fig. 26) of the measuring bridges in the form of periodic sequences of amplitude-modulated pulses are fed to the switch 5 signals. Switch 5 is controlled by pulses (Fig. 2a) from the distributor 2, strobe pulses (Fig. 2c) arrive at it from the output of the one-shot 14, which is started by pulses from the output of the element OR 11 through the first one-shot 13 (Fig. 2d) . The temporary position of the strobe pulses (Fig. 2c) in the middle of the unbalance pulses (Fig. 26) provides gating (cutting) of the middle part of the unbalance pulses free from emissions caused by parasitic capacitances of the measuring cables (Fig. 2e).

The transmitting device of the radio telemetry unit operates in two modes: “Balancing and“ Measurement. The mode setting is performed by the operator at the receiver. Received over the radio line to the receiver 23 command code for

There are two measuring bridge bridges, which are periodic sequences of pulses whose amplitudes do not vary with time (Fig. 26).

The control signal from the decoder 22 commands to the inputs of the switches 12, 17, 21, RPP 19 and RAM 18.

Balancing starts from the first channel. The address counter 20 in its initial state provides to the switch 10 and RAM 18 the address of the first channel. Only the first channel impulses pass through the switch 10 switchboard 2. These pulses through the switch 12 are fed to the launch of the one-shot 24 and 26, as well as to the RPF 19 and RAM 18 as clock pulses.

A single vibrator 24 generates pulses

the start (Fig. 2e) of the modulator 8, to the gate input of which the signal input is also fed through the adder 15 — the gated signal of the initial unbalance (Fig. 2e) from the switch 5.

The modulator 2 generates pulses whose temporal position corresponds to the measured value. In the balancing mode, the temporal position of these pulses (Fig. 2g) is detected by trigger 25 relative to the position of the pulses generated by the single vibrator 26 (Fig. 2h), the falling edges of which correspond to the position of the pulses from the output of the modulator 8 in the absence of the initial unbalance of the bridge (Fig. 2i ). The signal from the trigger 25 is fed to the information input of the BCP 19, in which, after each pulse arrives from the modulator 8, the corresponding bit (starting from the highest) of the initial unbalance code is stored at the trigger 25, which is stored in the RAM 18 and through the switch 17 enters the (D / A) ) 16, from the output of the last compensation signal is fed to the adder 15.

The channel balancing ends when the pulse from the modulator 8 coincides with the falling edge of the single-vibrator 26. After all the bits of the DF 19 have been tested, a signal is taken from its control output, which, through the switch 21, acts on the address counter 20 and sends to the switch 10 address of the second channel, then through the switch 10 from the distributor 2 receives the pulses of the second channel.

Further, the balancing process is carried out similarly on all channels. After balancing is completed, the device is switched to the measurement mode.

In the measurement mode, the measured signals in each channel containing information, before entering the modulator 8, are summed by the adder 15 with the initial unbalance compensation signals that come from the RAM 18 through the switch 17 and the DAC 16 by commands from the address counter 20. From the output of the adder 15 to the modulator 8 receives signals containing only measuring information.

Periodically carried out automatic balancing can significantly improve the accuracy of information transmitted by the device.

Claims (1)

Invention Formula A transmitting device of a radio-telemetry unit containing a clock generator, the output is connected to the first input of the distributor directly, and to the second through the driver of power pulses, To power amplifiers of pulses (where K is the number of measured parameters), whose inputs are connected to the corresponding 10 20 0 five .., five 0 five The outputs of the pulse distributor and the control inputs of the first switch, and the outputs - with the first diagonal of the measuring bridges, the first output of the second diagonal of which is connected to the common bus, and the second output - with the corresponding signal inputs of the first switch, radio transmitter, the first input of which is connected to the output of the module the torus, and the second through the synchronization pulse shaper - with the corresponding output of the distributor, characterized in that, in order to improve the measurement accuracy, four single vibrators are introduced into it, the second one, t the third, fifth and fifth switches, an address counter, an OR element, a command receiver, a command decoder, an operational storage node, a trigger, a sequential approximation register, a digital-to-analog converter and an adder, and the signal inputs of the second switch are connected to the inputs of the power pulse amplifiers and the element inputs OR, the output of which is connected to the first input of the third switch and, through serially connected first and second one-shot, to the gate inputs of the modulator and the first switch, the output ohm connected to the first input of the adder, the output of which is connected to the signal input of the modulator, and the second input - to the output of a digital-to-analog converter, the code inputs of which are connected to the outputs of the fourth switch, the first code inputs of which are connected to the output of the operational storage node, and the second to the code the outputs of the register of successive approximations and information inputs of the operational storage node, the address inputs of which are connected to the output of the address counter and the address inputs of the second switch ora, the output connected to the second input of the third switch, the control input of which is connected to the control inputs of the operational storage node, the fourth switch, the serial approximation register, the fifth switch and the output of the command decoder, the input connected to the output of the command receiver, the address counter input is connected with the output of the fifth switch, the first input of which is connected to the control output of the register of successive approximations, and the second input to the clock input of the modulator and through the third single The selector with the output of the third switch and the clock inputs of the operational storage node and the register of successive approximations, with the first trigger input directly and through the fourth one-shot with the second trigger input whose third input is connected to the modulator output, and the output with the sequential approximation register information input.