SU842912A1 - Telemetering system - Google Patents

Description

I

The invention relates to information-measuring technology and can be applied in telemetry, telecontrol, and long-distance communications.

A known radio telemetry system with time division of channels, containing in each channel sensors connected via matching devices to the inputs of the first switch, the first input of which is connected to the sensor output of calibration voltages, and the output of the first switch through the module LR, another input which through the clock encoder is connected to the output of the chronizer, the other two outputs of the latter are connected to the control inputs of the first switch and modulator, the output of the OR circuit is connected To the input of the transmitter, the output of which is connected through the communication channel to the input of the receiver, the output of which is connected to the input of the second switch and the input of the extraction and timing device, the output of the latter is connected to the control input of the second switch, the outputs of which the inputs of the registering device, the control input of which is connected to the output of the block of time stamps 1.

A disadvantage of such devices is that the scanning speed of the sensors is constant and is determined by the need to transmit with the required accuracy the most active (fast-changing) signals, which leads to significant redundancy in information transfer.

This deficiency has no measurement systems that regulate the rate at which sensors are polled.

A device for interrogating sensors is known which is closest in technical essence to the proposed one. This device contains sensors in each channel, the outputs of which are connected to the inputs of keys and convergence tolerance converters (APPs), the outputs of which are connected to the inputs of a summing unit, the output of which is connected to the distributor through controlled frequency generator and the outputs of which are connected to control inputs of keys exits

which are combined and connected to the output of the device. In this case, the receiving part of the system can also be built as in the previously known device 1. On the transmitting side, the PSA continuously analyzes the signals from the sensor outputs and outputs to the summing voltage block, propositional approximation errors in accordance with the selected algorithm. At the output of the summing unit, a voltage appears proportional to the total approximation error for all sensors. This voltage is applied to a controlled oscillator, the output of which (frequency) controls the speed at which the sensors are polled according to the total approximation error. The sensor signals by means of the transmitter are transmitted through the communication channels to the receiver and are divided into clock signals (sensor switch signals) and information signals. Next, the information signals through the second switch come through the corresponding demodulators to the recording device. The second switch is controlled by the same signals as the first switch on transmitter side 2.

The disadvantage of this device is an increase in the error of approximation in the event of a breakdown in the communication channel, since in this case distorted samples are fed to the inputs of the demodulators.

The purpose of the invention is to improve the accuracy of the telemetric system by adjusting the polling rate on the transmitting side, not only in accordance with the activity of the input signals, but also taking into account the effect of interference in the communication channel.

The goal is achieved by the fact that in a telemetering system containing a controlled frequency generator on the transmitter side, the output of which is connected to the distributor input, the transmitter, the output of which is connected to the communication channel, the first adder and in each information channel the sensor, the output of which is connected to the first the input of the key and the input of the approximation error converter, the outputs of the converters of the approximation error of the information channels are connected to the corresponding inputs of the first adder, the outputs p the distributor is connected to the second inputs of the keys of the corresponding information channels, the outputs of the keys are combined and connected to the transmitter input, on the receiving side the receiver, whose input is connected to the communication channel, the output is connected directly to the first input and through the selection of the synchronization signals to the second input of the switch and in each information channel there is a demodulator, the outputs of the demodulators are connected to the corresponding inputs of the registration unit, a reverse communication channel is entered, on the transmitting side — reception nick, difference unit and second adder, the output of the first adder is connected to the first inputs of the second adder and difference block, the output of which is connected to the second input of the second adder, the output of which is connected to the input of the controlled frequency generator, the output of the receiver is connected to the second input of the difference block, the input receiver, connected to a reverse communication channel, a transmitter is inserted at the receiving side, an adder, the output of which is connected via a transmitter to the reverse communication channel, and a data converter in each information channel generality approximation, whose input is connected to the output of demodulator outputs pogreschnosti approximation converters are connected to respective inputs of the adder.

The drawing shows a block diagram

the proposed telemetering system.

The telemetry system contains

0 on the transmitting side information channels 1, including keys 2, approximation error converters 3 (PAP) and sensor 4, difference block 5, second adder 6, controlled frequency

J generator 7, distributor 8, first adder 9, transmitter 10, receiver 11, switch 12 on the receiving side, clock separation module 13, receiver 14, information channels 15, approximation error converters 16 and demodulators 17, registration block 18, adder 19, a transmitter 20. The telemetering system also includes a communication channel 21 and a feedback channel 22. Sensors 4 are designed to convert a measured parameter into an electrical signal, such as a DC voltage. The keys 2 with the distributor 8 are the switch of the transmitting side and are used to transmit a signal from the sensor by means of the transmitter 10 to the communication channel 21. Converters 3 approximation faults (PPA) are used to sample the signal proportional to the approximation error. The adder 9 serves to create a voltage proportional to the sum of the approximation faults from all the FPA 3. Difference unit 5 serves to create a voltage proportional to the difference of the total approximation error on the transmitting side (from block 9) and the same error on the receiving side transmitted over the reverse the communication channel 22 from the adder 19. The adder 6 serves to sum the total approximation error of the transmitting side and the error difference from block 5, moreover, if the approximation error is

5 from block 9 is more than the error from block 19, then the output signal of block 5 of the difference is zero. The switch 12 and the sync signal extraction unit 13 are used to transmit sensor signals to the respective module modules 17 for restoring the sampled sensor signals. The recording unit 18 serves for multi-channel signal recording. Converters 16 approximation errors are used to produce a voltage proportional to the approximation error of the reconstructed signals. The assignment of the adder 19 is similar to the assignment of the adder 9. The transmitter 20, the return communication channel 22 and the receiver 11 serve to transmit the total error from the adder 19 to the transmitting side.

The operation of the proposed telemetering system is as follows.

On the transmitting side, the PSA 3 continuously analyzes the signals from the outputs of the sensors 4 and outputs a voltage proportional to the approximation error to the adder 9. The voltage proportional to the sum of the error of the approximation of all channels from the adder 9 is fed to the difference unit 5, to the second input of which voltage is applied proportional to the same error but calculated on the receiving side by the adder 19 and transmitted over the reverse link. If there are failures in the communication channel, the total approximation error on the receiving side is greater than the same error on the transmitting side. The difference between the approximation errors of the receiving and transmitting sides is added by the adder 6 with the total error of the transmitting side. The output voltage of the adder 6 controls the operation of the generator 7, built, for example, on the basis of the Roehr multivibrator. The output signal (frequency) of the generator 7 controls the operation of the distributor 8 and the keys 2, and information. The Qi from sensors 4, along with the clock signals, alternately goes through the transmitter 10, the communication channel, the receiver 14 and the switch 12 to the corresponding demodulators 17. The signals recovered by the demodulators are registered by the block 18 and simultaneously analyzed by the receiving side PPA 16. The total error in the approximation of the receiving side from the adder 19 through the transmitter 20, the return channel 22 of the communication and the receiver 11 is transmitted to the transmitting side of the system, where it is compared with the error in the approximation of the transmitting side. If the error in the approximation of the receiving side is greater than the approximation error of the transmitting side, this means that the communication channel has failed, and to increase the noise immunity, the number of signal samples increases, i.e., the sensor polling rate increases. With the same errors, the polling rate is determined only by the total approximation error of the transmitting side.

Thus, depending on the level of interference in the communication channel, in the proposed system, the polling rate of the sensors is controlled and thereby the accuracy of telemetry is increased. As a preliminary calculation shows, for real channels with given noise levels, by adjusting the polling rate, accuracy can be increased by a factor of 2-3.

Claims (2)

Invention Formula 0 A telemetry system containing on the transmitting side a controlled frequency generator, the output of which is connected to the distributor input, the transmitter, the output of which is connected to the communication channel, the first adder and a sensor in each information channel, the output of which is connected to the first key input and to the input approximation error converter, outputs of approximation error converter converters of information channels 0 is connected to the corresponding inputs of the first adder, the outputs of the distributor are connected to the second inputs of the keys of the corresponding information channels, the outputs of the keys are combined and connected to the input of the transmitter, on the receiving side - 5, the receiver, whose input is connected to the communication channel, the output is connected directly to the first input and through the sync signaling unit to the second input of the switch, the registration unit and the demodulator in each information channel, the output of the demodulators are connected. with the corresponding inputs of the registration unit, characterized in that, in order to improve the accuracy of the system, a reverse communication channel is entered into it, on the transmitting side - a receiver, a difference unit and a second adder, the output of the first adder is connected to the first inputs of the second adder and the difference unit The output of which is connected to the second input of the second adder, the output of which is connected to the input of the controlled 0 of the frequency generator, the receiver output is connected to the second input of the difference unit, the receiver input is connected to the reverse communication channel, a T1 transmitter is added to the receiving side, an adder whose output is connected to the reverse link through the transmitter, and an approximation inversion converter in each information channel whose input is connected to the output of the demodulator, the outputs of the approximation error converters are connected 0 with the corresponding inputs of the adder. Sources of information taken into account in the examination 1. Barazkov F. I., Rusanov Yu. B. Elements and devices of radio telemetry systems. M., “Energie, 1973, p. 17 2. USSR author's certificate № 464075 cl. H 03 K 17/00, 1974 (prototype).