SU1020850A1 - Device for transmitting telemetry - Google Patents

Abstract

1. DEVICE FOR TRANSMISSION OF TELEVISIES; containing a clock generator 1Shpulsov, the output of which. connected to the counting input of the start-up unit, the output of which is connected to the input of the distributor of the pulses, the first output of which is connected to the address inputs of the counting unit, the OR element, the code of which is connected to the input of the start of the starting block, an analog-to-digital-digital converter, information outputs which is connected to the "" formational inputs of the unit with the reading, the information output of which is connected to the output of the device, and in each measuring channel.containing sensor, the output of which is connected to the informational inputs in the first time discretizer and the key, the first element is And, the output of which the connection is (the adapter with the reset input of the adaptive time discretizer, the second element and the output of which is connected to the & s key control input, the first input of the first element And and corresponding -. The input of the element OR, the keys of all the measuring channels are combined and connected to the information of the HHOTty input of the analog-digital converter, the equal output of the reader is connected to the control input of the trigger; and the Combined second inputs of the first elements And of all measuring channels, the second outputs of the pulse distributor are connected to the first inputs of the second elements And measuring channels, o and t and with the fact that, in order to improve the accuracy of the device ,; In each measurement channel, an interval duration restriction block is inserted, the output of which is connected to the second input, the second element I, the output of the timed sampler and iKitXQa of the first element I is connected respectively to the second and the inputs of the interval duration restriction block, the third input of which is connected to the output The clock pulse generator, the control for the 1st input and the output of the analog-digital converter, are connected respectively to the output of the OR element and the control input of the reading unit. 2, The device according to claim 1, about t. L and cheating with. . in that the unit for determining the duration of the SP interval is performed on the counter, the OR element and the BANGE element, the output of which is connected to the first input of the counter, the output of which is connected to the nepBtiM input of the OR element and niepBtan input: the Z.APRET element, second {Me: 1e inputs the element OR, the counter and the element BAN IT It is the output of the element OR are connected respectively with the first, second and third inputs and the output of the block for limiting the interval duration.

Description

The invention relates to measurement information systems and, can be used in telemetry automatic control systems, in the long-haul, where it is necessary to reduce the amount of redundant information.

A device for transmitting telemetry, containing in each channel information sensors 4atsii, adaptive time samplers (AVD), elements AND, keys, analog-to-digital converter (ADC), pulse generator, trigger circuit, pulse distributor containing a counter and a decoder, element OR is known , a circuit for determining the number of applications in a queue, a setting unit, an addressing scheme / a reading unit, a counter, a code comparison unit, a waiting multivibrator, a switching unit of counters and additional elements

The disadvantages of this device are greater complexity / and, therefore, low reliability due to the large number of connections and the presence of an address determination circuit, a setting switching unit, a number determination circuit, a queue, and a count switching unit. In addition, in such a device it is impossible to set the time between the forced control and polls for each low-active channel, which is advisable for different channels of the importance of the transmitted information.

It is also known a device for transmitting telemetry, containing in each channel sensors connected to the inputs of adaptive variable samplers and keys, the elements I and BXO of the first of which are connected to the corresponding outputs of adaptive modern samplers and outputs of the pulse distributor, outputs to keys, the inputs of the second The elements And are connected respectively with the input and and with the output of the reading unit, the outputs are connected to the inputs of adaptive-time samplers, an analog-to-digital converter, whose input is inden with the key input of each channel, the outputs with the inputs of the readout unit, the pulse generator whose output is connected to the pulse distributor through the startup unit, the installation unit whose outputs are connected to the inputs of adaptive modern samplers, the number of queuing units whose inputs are connected to the first outputs And elements and the inputs of the second elements And, and the outputs are connected to the inputs of the block settings.

In the specified Device, the first priority is the transmission of information from those channels in which the error of signal approximation has reached the Permissible value in accordance with the algorithm of adaptive discretization G2 laid down in the AED.

A disadvantage of the known device is the prolonged absence of information from low-active channels, where the signals change at low speeds and the approximation error does not reach an acceptable level for a long time. Information from channels with constant signals or with faulty AEDs may be completely absent. This reduces the consumer's confidence in the reliability of the data obtained and leads to partial or complete loss of data with faulty AVDs, which is accompanied by the appearance of unacceptably large (up to 100%) errors in signal recovery.

The purpose of the invention is the elimination of the possibility of the occurrence of large errors in signal recovery, that is, an increase in the accuracy of the device due to receiving information from channels with faulty AVDs and from low-active channels at the required time points.

The goal is achieved in that the device for transmitting telemetry, containing a clock pulse generator, the output of which is connected to the counting input of the trigger unit, the output of which is connected to the input of the pulse distributor, the first outputs of which are connected to the address inputs of the readout unit, OR element, which output is connected with the start input of the start-up unit, an analog-digital converter, the information outputs of which are connected to the information inputs of the reading unit, the information of which is output from It is single from the output (by the 3D device, and in each measuring channel contains a sensor, whose link is connected to the information inputs of the adaptive time sampler and key, the first And element, the output of which is connected to: the Adaptive Time Adapter of the discretizer, the second element And, in% stroke which is connected to the control input of the key, the first input of the first element AND and the corresponding input of the element OR, the outputs of the keys of all the measuring channels are combined and connected to the information input of the analog-digital converter The driver controlling the output of the readout unit is connected to the control input of the start-up unit and the combined second inputs of the first elements AND of all measuring channels, the second outputs of the pulse distributor are connected to the first inputs of the second elements AND of the measuring channels. whose output is connected to the second "input of the second element AND, the output of the adaptive time sampler and the output of the first element AND are connected respectively to the first and second inputs unit, limiting the duration of the interval, the third input of which is connected to the output of clock pulse generator, a control input and an output Q logo ana-digital converter connected respectively to the output of the OR gate and the control input of the read block. .

In addition, the block for limiting the interval duration is made on the counter, the OR element and the BANGE element, the output of which is connected to the first input of the counter, the output of which is connected to the first input of the OR element and the first input of the BANGE element, the second 20 input of the element OR, the counter and the element BAN and the output of the element OR are connected respectively with the first,. the second and third inputs and output of the block for limiting the duration of the inter-25 shaft.

The drawing shows a block diagram of the proposed device.

The device contains in each of the MiepHTejibHOM channel 1 sensors 2 for the conversion of measured parameters. the object's ditch into electrical signals: adaptive time samplers (AVD) 3 for processing a logical 1 signal when the approximation error in each channel 1 reaches the permissible value of the first elements AND 4 to generate an AVD reset signal, the second elements AND 5. for key management b , block 7 for limiting the duration of the interval between the intervals by adjacent samples of the signal, which contains the element OR 8 and the counter 9, designed to form the intervals of a predetermined duration and the element BAN 10, 45

In addition, the device contains; dispenser 11 pulses; including in For example, the counter 1.2 of the distributor and the decoder 13 and intended for the serial 6p-50 dew of all channels 1 and for the formation of the address code of the selected channel for transmission, the read block 14 for converting the parallel address code and information of the selected Cail. to the serial code and transmitting it to the communication line, the OR 15 element to generate a signal that triggers the analog-to-digital converter (ADC) 16 and stops the distributor 11, the generator 17 clock pulses 60 pulses, the start block 18, containing Both 18 and trigger 20 and the control for starting and stopping the distributor 11 pulses.

The signals from sensors 2 in each measuring channel 1 are fed to the inputs of the AED 3, in which the current error of signal approximation is calculated in accordance with a given algorithm and this error is compared with the permissible level (setpoint). Upon reaching the setpoint at the output of the AED 3, a logical 1 signal appears, passes the output of an additional element OR 8. At the same time, the pulses from the generator 17 through the prohibition element 10 fill the counter 9. If the counter 9 overflows in any channel at the era of output 1, which closes the prohibition element 10, stopping further impulse access, and passes to the output of the element OR 8. Thus, the signal of logical 1 at the output of the element OR 8 in any channel 1 can occur for two independent reasons — when the current pogr In fact, the approximation in this channel of the setpoint value or when the counter overflows is 9.

After the end of the transmission of the address code and information to the communication line, a pulse appears at the control output of the readout unit 14, which sets the trigger 20 into one state, And 19 opens, through which pulses from the generator 17 start to flow into the distributor 12. The signal 1 from the outputs of the decoder 13 is alternately fed to the first inputs of the second elements 5, the second inputs of which are connected to the outputs of the additional elements OR 8. If two signals 1 coincide at the inputs of the second element 5, in any channel 1 CPA .batyvaet OR gate 15, flip-flop 20 in -oprokidyvayuschy zero state, AND gate 19 is closed and valve 11 is stopped at the position of the channel.

Logical 1 from the output of the second element AND 5: prepares the first element AND 4 and opens the key b of the selected channel, the signal is sent to the information input of the A / D converter 16, which is simultaneously started from the output of the element OR 15. After the analog-to-digital converter signal The output of the A / D converter 16 starts the read block 14, which converts the parallel code from the output of the A / D converter 16 and the parallel code of the address of the selected channel from the output of counter 12 to a serial code and transmits it to the communication line. After the transfer is completed, a pulse appears again at the output control of the readout unit 14, the prepared first element 4 is triggered, and the accumulated approximation error is reset to the AED 3 of the transmitted channel.

Signal 1 disappears at output of AVD 3 and also, counter 9 of this channel is reset to zero state and signal 1 disappears at output of element OR 8. At the same time trigger 20 is reset to one and distributor 11 continues further channel search for the next transmission.

With a high activity of the input signals, the AVD 3 have time to operate and the corresponding channels have time to interrogate. S before the repetition of the counters 9 in these channels occurs. In this case, the counters 9 have time to be reset to the zero state before they overflow and do not affect the operation of the device, which is at. this is no different from the operation of the known device. If a signal is inactive or a malfunctioning AVD 3 in any channel, polling requirements on this channel (signals 1 on, outputs of the elements OR 8) will appear due to overflow of counter 9. In this case, the maximum time between polling of the channel is determined by the activity other channels and the capacity of the counter 9, which in each channel can be set different depending on the degree of importance of the transmitted information.

The maximum error in the recovery of signals in channels with faulty AVDs during restoration, for example, (Stepwise extrapolation can be estimated using formula (2).

 , (,,

where Xf is the maximum value of the derivative of the signal, which can be estimated based on the Bernstein inequality

, (2)

where is the maximum frequency in

signal spectrum, X, - the maximum value of the signal;

At is the time interval between adjacent samples, which is determined by the pulse frequency t of the GTI 17 and the capacitance N of the counter 9

Atfi. (3)

The capacity N of the counter 9 in each case can be calculated on the basis of expressions (1) - (3) from the known dynamic properties of the signal and the permissible error of recovery.

If in case of malfunctioning of the AVD 3, allow y (/ X) 100% 5 - 10% and take into account that in a known device, in this case, the occurrence of the yoghisurity -j- 100% is possible, then when using the proposed device, the error in signal recovery in the faulty channel 5 compared to the well-known twenty twenty times.

Claims (2)

1. DEVICE FOR TRANSMISSION OF TELEVISION MEASUREMENTS, comprising a clock pulse generator, the output of which ‘is connected to the counting input of the start-up unit ^ whose output is connected to the input of the pulse distributor, per-. outside the output of which are connected to the address inputs of the reader, the OR element, the output of which is connected to the stop input: the start block, an analog-to-digital converter, the information outputs of which are connected to the information inputs of the reader, the information output of which is connected to the output of the device, and in each measuring channel containing a sensor, the output of which is connected to the adaptive- information inputs. a temporary sampling device and a key, the first element AND, the output of which is connected to the reset input of the adaptive time sampler, the second element AND, the output of which is connected to the control input of the key, the first input of the first element N and the corresponding input of the OR element, the key outputs of all measuring channels are combined and connected to the information input analog-to-digital Converter, the control output of the reader is connected to the control input of the trigger unit and the combined second inputs of the first elements AND all of measuring channels, the second outputs of the pulse distributor are connected to the first inputs of the second elements AND of the measuring channels, so that in order to increase the accuracy of the device, an interval limiting block is introduced into each measuring channel, the output of which connected to the second input of the second element And, the output of the adaptive time sampler and the output of the first element And are connected respectively by the first and second inputs of the duration limiting unit, the interval a / third input of which is connected to the output clock generator, a control input and {output of the analog-digital converter connected respectively to the output of the OR gate and the control input of the read block. 2. · The device according to claim 1, t and l e e. I . the fact that the interval limitation block is made on the counter, the OR element, and the FORBID element, the output of which is connected to the first input of the counter, the output of which is connected to the first input of the OR element and the first input of the FORBID element, the second inputs of the OR element, counter and the FORBID element and the output of the OR element is connected respectively to the first, second and third inputs and outputs of the interval limitation block. , .., SU „1020850