SU1103275A1 - Device for transmitting telemetrical information - Google Patents

Abstract

1. A DEVICE FOR TRANSMITTING TELEMETRIC INFORMATION containing a chronizer, the first output of which is connected via a pulse shaper to the first input of the OR element, the second output to the generator input, the third output to the first inputs of the information compression blocks, the fourth output to the first input of the switch, the second The switch inputs are the device inputs, the switch outputs are connected respectively via an analog-to-digital converter with the second inputs of information compression blocks and the first inputs of the summers, the second inputs ummatorov connected to respective outputs of the generator, connected to the outputs of the adders. the corresponding first inputs of the key block whose outputs are connected to the corresponding first inputs of the encoder, the second inputs of the encoder are connected to the first outputs of the corresponding information compression blocks, the output of the encoder is connected to the second input of the OR element, the output of which is the output of the device, characterized in that Noise immunity of the transmitted information, a decoder is entered into the device, the inputs and outputs of which are connected respectively to the second outputs and the third inputs of information compression blocks, torye key block inputs connected to respective outputs of the first compressed information block. 2. The device according to claim 1, that each of the data compression block contains a comparison element, the elements And the trigger, the output of the first element I. is connected to the trigger input, the output of which is connected to the first input of the comparison element, the first input The first element And, the second input of the comparison element and the first input of the second and third elements are respectively the first, second and third inputs of the information compression blocks, and the code of the second element And is connected to the second. The primary input of the first element AND is the first output of the information compression unit, the output of the comparison element is connected to the second input of the second element AND, and is the second output of the information compression unit. 3. Device pop. 1, characterized in that the encoder contains adders, subtractors and an amplifier, the output of the first adder is connected to the first input of the first subtractor, the second input and output of which are connected respectively to the output of the second subtractor and the first input of the amplifier, the second input of the amplifier is connected to the output of the second adder, the first inputs of the first adder are combined respectively with the first inputs of the second subtractor and are clashed with the first inputs of the encoder, the second

Description

The inputs of the second subtractor are combined respectively with the inputs of the second sum and are the second inputs of the encoder, the output of the amplifier is the output of the encoder.

4. The device according to claim 1, characterized in that the decoder contains adders and threshold elements, the output of each subsequent adder is connected to the first

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the input of each previous adder and with the input of the corresponding threshold element, the input of the last threshold element is connected to the first input of the last adder, the second inputs of the adders, and the first input of the last adder are respectively the inputs of the decoder, the outputs of the threshold elements are the decoder outputs.

The invention relates to information-measuring technology and can be used in radio telemetry systems with channel separation by waveform.

A device comprising a chronizer, a redundancy reduction unit, a code group generating unit, an address coding unit, a code generation unit, a time interval coding unit, a code signal generating unit are known. In this device, the readings taken from the sensors are compared with the previous calculations of the same sensors stored in memory and, if the difference between them is more than a certain amount called aperture, the readout is considered significant and is transmitted to the transmission line as well as recorded in. memory instead of the previous one; otherwise, the count is considered redundant and is not taken into account ij.

The disadvantage of this device is over-. This is due to the fact that, due to the inherent principle of temporal channel separation, essential counts follow unevenly, and the device requires a buffer storage unit to equalize the sampling rate. In addition, essential readings need to be assigned an address in the form of additional code bits and a temporary anchor code. This introduces additional redundancy due to overhead. With the transfer of significant samples, all codeword bits are transferred digitally, while only a few of them change their values, therefore redundancy remains in the information words themselves. The redundant characters in the transmitted messages spend some of the energy that could be used to transmit non-redundant characters.

The closest to the proposed technical entity is a device for transmitting telemetry information, containing a chronizer, the first output of which is connected via a pulse shaper to the first input of the OR element, the second output - to the generator input, the third output - to the first inputs of data compression blocks, the fourth output with the first input of the switch, the second inputs of the switch are the inputs of the device, the outputs of the switch are connected respectively via an analog-digital converter with the second inputs of blocks this information and the first inputs of the adders, the second inputs of the adders are connected to the corresponding generator outputs, the outputs of the adders are connected to the corresponding first inputs of the key block, the second inputs of which are connected to the first outputs of the corresponding compression blocks of information, the outputs of which are connected to the corresponding first inputs of the encoder, the second inputs of the encoder are connected to the second outputs of the respective compression blocks, information, the output of the encoder is connected to the second input of the OR element, the output of which is the output Article roystva 2j. The disadvantage of such a device is that data transmission is carried out without taking into account the signal-to-noise ratio in the transmission channel. However, due to the random nature of the process being measured, there may be times when the number of subcarriers is simultaneously transmitted. Since the energy of the total group signal is limited, this leads to the fact that for each transmitted carrier there is a relatively small proportion of the transmitter energy. As a result, the error in receiving the binary symbol increases and the error in restoring the count on the receiver side increases. At low energy, the subcarriers present the largest error in restoring the reference to the noise of the transmission channel. The purpose of the invention is to increase the noise immunity of transmitted information. This goal is achieved by the fact that a device for transmitting telemetric information, comprising a chronizer, the first output of which is connected via a pulse shaper C; the first input of the OR element, the second output — with the generator input, the third output — with the first inputs of data compression blocks, the fourth output — with the first input of the switch, the second inputs of the switch are device inputs, the switch outputs are connected via an analog-to-digital converter with the second inputs adders, the second inputs of the adders are connected to the corresponding outputs of the generator, the outputs of the adders are connected to the corresponding first inputs of the block of keys, the outputs of which are connected to the corresponding encoder inputs, the second encoder inputs are connected to the first inputs of the corresponding information compression blocks, the encoder output is connected to the second input of the OR element, the output of which is the device output, the decoder is entered, the inputs and outputs of which are connected respectively to the second outputs and the third inputs of the compression blocks information, the second inputs of the key block are connected to the first outputs of the corresponding information compression blocks. Each information compression block contains a comparison element, And elements and a trigger, the output of the first element And is connected to the trigger input, the output of which is connected to the first input of the comparison element, the first input of the first And element, the second element input, the comparison and the first input of the second And element are the first, second and third inputs of the information compression blocks, respectively; the output of the second element I is connected to the second input of the first element I and is the first output of the information compression unit; the output of the comparison element is connected to the second input house the second AND gate and the second output is a compressed information unit. The encoder contains adders, subtractors and an amplifier, the output of the first adder is connected to the first input of the first subtractor, the second input and the output of which are connected respectively to the output of the second subtractor and the first input of the amplifier, the second input of the amplifier is connected to the output of the second standard, the first inputs of the first adder are combined respectively with the first inputs of the second subtractor and are the first inputs of the encoder, the second inputs of the second subtractor are combined respectively with the inputs of the second adder and the second inputs are the code pa, the output of the amplifier is the output of the encoder. The decoder contains adders and threshold elements, the output of each subsequent adder is connected to the first input of each previous adder and the input of the corresponding threshold element, the input of the last threshold element is connected to the first input of the last adder, the second inputs of the adders and the first input of the last adder are respectively the decoder inputs, the outputs of the threshold elements are the outputs of the decoder. The drawing shows a block diagram of a device for transmitting telemetry information. The device contains a chronizer 1, a switch 2, a generator 3, a pulse shaper A, blocks 5 for compressing information, an analog-digital converter 6, a decoder 7, adders 8, a block 9 of keys, an encoder 10, and an element OR 11. The decoder 7 contains adders 12 and threshold blocks 13. Compression information blocks 5 contain a comparison element 14, elements 15 and 16, and a trigger 17. Encoder 10 contains an adder 18, readers 19 and 20, an adjustable amplifier 21 and an adder 22. The device operates as follows. Chronizator 1 provides synchronization signals to switch 2, generator 3, generator 4 pulses, and information compression blocks 5. The analog signals are interrogated by the switch 2 simultaneously on all channels with a period equal to the sampling period, and are converted in the analog-digital converter 6 into a parallel binary code stored at the output of the analog-digital conversion 6 until the next polling moment. In block 5 compression, samples the bottom is compared with the memorized previous significant readings of these crops. If any bits of the digital code of the essential samples do not match, the overhead signals from the control outputs of the compression blocks 5 corresponding to these bits are fed from to the decoder 7. In the decoder 7, the total number of received overhead signals is determined and compared with the threshold. The threshold corresponds to the largest number of simultaneously transmitted code words in the system and is selected based on the conditions for ensuring the minimum of the recovery error of the measured parameter at the receiving side. In the decoder 7, the total number and numbers of the lower bits prohibited for transmission are determined, and control signals are supplied to the compression blocks 5. When detecting mismatching bits in compression blocks 5 and the enabling control signal from the decoder 7, these bits are considered significant and should be transmitted, and their values are stored in compression blocks 5. All other bits are considered redundant, are not recorded in the memory and are not transmitted to the channel. The values of the bits are given to adders where they modulate code words periodically coming from generator 3. From the control outputs of compression blocks 5, in which significant bits are detected, control signals are sent, which in block 9 of the keys unlock the keys corresponding to essential bits, and modulated code words are passed to the information inputs of the encoder 10, or the keys are closed corresponding to the full bit; in this case, empty words consisting of all zeros are assigned to the outputs of these keys. At the same time, the control signals from the first control outputs of the compression blocks 5 are fed to the control inputs of the encoder 10, and as many zeros as many empty words are received at these inputs at its information inputs. An encoder signal is generated at encoder 10. In particular, the group signal can be formed as follows. The values of all code words are analyzed character-by-character and the number of ones and the number of zeros are compared, and the zeros of the empty words are not taken into account. If the number of units is greater than number. Zero, then the unit 1 is output at the output of the encoder 10, otherwise the symbol is zero. If the number of zero and single symbols is equal, the decision is made to issue a zero or one according to the rule used in the prototype. In the OR 11 element, a synchronization pulse is received from the imaging unit 4. An example is added to the generated frame. The analog signal is interrogated by the switch 2, the input of the analog-digital converter 6 is fed a count, the amplitude of which is equal to the parameter at the time of the interrogation. In the analog-to-digital converter 6, the analog sample is converted to digital and stored for the duration of the polling interval. Suppose that the values of the smallest bits from the first to the third measured sample are not coBna; jaK) T from the value of the similar bits of the previous sample, but the values of the fourth most significant bits are the same. In blocks 5 (- 5 compression, the values of the similar bits of the measured and preceding samples are compared. The control output of the fourth compression block 5 is set to zero potential, since the higher bits of the unmeasured and the previous samples coincide, and on the control outputs of the remaining 5 blocks compression is set to a single potential, since the values of like lower-order bits do not match. In decoder 7, the total number of non-matching bits, for example, 3, is compared with the threshold, for example, 2. Because , one low-order, non-coincident bit must be dropped, so a forbidding zero potential is established at the first output of the decoder 7, and at the other outputs, resolving the single potentials that are applied to the compression blocks Sg - 5. Thus, at the control input of the fourth block 5 compression has a resolving positive potential, however, the value of this bit of the measured sample coincides with its value for the previous one, therefore this bit is considered redundant, and from the control output of the fourth compression unit 5 odaets zero potential. The values of the second and third bits of the measured sample do not coincide with the values of these bits in the previous sample, and a positive potential is supplied to the control inputs of the Zl and 5l blocks of compression from the decoder 7, therefore, the control outputs of the 5 and 5 blocks of compression are set resolving potentials, and the bits are considered significant and are written to the memory of these compression blocks. The value of the first bit of the measured sample does not coincide with the value of the first bit of the previous sample, however a forbidding zero potential is applied to the control input of the compressing unit 5 from the decoder 7, so that the bit is considered redundant, and the suppressor is set at the control output of the compressing unit 5f zero potential. The value of the first bit in the memory of the compression unit 5j is not recorded. The zero potentials from blocks 5i and 5 lock the keys in block 9 keys for the first and fourth code words. In adders 8, code words are multiplied, and for 5 of this example, the code words corresponding to the second and third bits are inverted. The key block 9 skips only those code words that correspond to significant second and third bits and produce empty code words for redundant first and fourth bits. Encoder 10 generates a baseband signal. Compression unit 5 for each bit operates as follows. The value of the bit comes from the output of the analog-digital converter 6 and is compared in comparison element 14 with the value of the previous sample discharge stored in trigger 17. If these values match, then the discharge is considered redundant and comparison element 14 does not work, and the trigger 17 remains in its original state. If these values do not match, then at the output of the comparison element 14 a single potential is established, which is fed to the input of the element 15 and to the control output of the compression unit 5. IF the analyzed bit is redundant, then the input potential of the element 15 from the decoder 7 gives a zero potential and the circuit does not work. If the analyzed bit is significant, then a unit potential enters the input of element 15 and a single potential is established at its output, which is fed to the control output of the compression unit 5, and also opens element 16. At the end of the polling period before. the next measurement of the next reference from chroniser 1 through the open element I 16 and a sync pulse passes, which flips trigger 17. Thus, the trigger 17 records the new value of the significant bit, which in the next cycle is compared with the value of this bit of the next count. The decoder 7 works as follows. Each adder 12 calculates the number of inputs with positive potentials for all bits, starting from the oldest. The smaller the number of the adder 12, the greater the number in it is recorded. Thus, for the considered example, the number 1 will be written in the adder 12j, in the adder 12) is the number 3. These values are 9

neither in the threshold elements 13 are compared with the threshold m 2, and when this threshold is exceeded, the threshold elements 13 produce forbidding zero potentials. At the first output of the decoder 7, the inhibiting zero potential is established, and at the remaining outputs, the resolving positive potential.

Encoder 10 operates as follows.

At the inputs of the adders 18 and subtractor 20 all the code words arrive simultaneously. Subtractor 20 determines the number of null characters of non-redundant words. In subtractor 19, the amplitude of the group

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signal as the difference between the number of ones and the number of zeros.

In the adjustable amplifier 21, the group signal is amplified to

5 of the most complete use of the dynamic range in amplitude. The gain is determined by adder 22, the output voltage of which depends on how much positive the potential is applied to the inputs, i.e. from the number of transmitted code words.

The proposed device makes it possible to reduce the mean square error in the recovery of signals, depending on the value of the code words used in the presentation of the measurement samples.

Claims (4)

1. DEVICE FOR TRANSMISSION OF TELEMETRIC INFORMATION, containing a chronizer, the first output of which is connected through a pulse shaper to the first input of the OR element, the second output to the input of the generator, the third output to the first inputs of information compression units, the fourth output to the first input of the switch, the second , the inputs of the switch are the inputs of the device, the outputs of the switch are connected respectively through an analog-to-digital converter with the second inputs of the information compression blocks and the first inputs of the adders, the second inputs are summarized s are connected to the respective oscillator outputs, the outputs of the adders are connected to. the corresponding first inputs of the key block, the outputs of which are connected to the corresponding first inputs of the encoder, the second inputs of the encoder are connected to the first outputs of the respective information compression blocks, the output of the encoder is connected to the second input of the OR element, the output of which is the output of the device, characterized in that, in order to increase noise immunity of the transmitted information, a decoder is introduced into the device, the inputs and outputs of which are connected respectively to the second outputs and third inputs of the information compression blocks, the second inputs The odes of the key block are connected to the first outputs of the corresponding information compression blocks. 2. The device according to p. 1, characterized in that each information compression unit contains a comparison element, AND elements and a trigger, the output of the first element I. is connected to the input of the trigger, the output of which is connected to the first input of the comparison element, the first input of the first AND element, the second input of the comparison element and the first input of the second element And are respectively the first, second and third inputs of the information compression units, the output of the second element And is connected to the second input of the first element And is the first output of the information compression unit, the output is ele cient comparison connected to the second input of the second AND gate and a second output of the data compression block. 3. The device pop. 1, characterized in that the encoder contains adders, subtractors and an amplifier, the output of the first adder is connected to the first input of the first subtractor, the second input and output of which are connected respectively to the output of the second subtractor and the first input of the amplifier, the second input of the amplifier is connected to the output of the second adder, the first inputs of the first adder are combined respectively with the first inputs of the second subtractor and are the first inputs of the encoder, the second> the inputs of the second subtractor are combined respectively with the inputs of the second adder and are the second inputs of the encoder, the output of the amplifier is the output of the encoder. 4. The device pop. 1, characterized in that the decoder contains adders and threshold elements, the output of each subsequent adder is connected to the first input of each previous adder and to the input of the corresponding threshold element, the input of the last threshold element is connected to the first input of the last adder, the second inputs of the adders, and the first input of the last adders are respectively the inputs of the decoder, the outputs of the threshold elements are the outputs of the decoder.