SU771698A1 - Telemetering system receiving device - Google Patents

Description

(54) RECEPTION DEVICE OF THE TELEMETRIC SYSTEM

one

The invention relates to an information-measuring technique and can be applied in telemetry and telecontrol.

A well-known telemeasuring framework in which zero-side extrapolations are performed on the receiving side based on discrete readings of telemetry signals. The receiving device of this system contains in each channel a serially connected digital storage device and a digital-to-analog converter. The information inputs of the charger are connected to the output of the intermediate-level J5 noise module, and the control inputs are connected to the corresponding outputs of the distributors connected to the output of the synchronization unit, the input of the intermediate memory block is connected to the output 20 of the decoder; synchronization is connected to the input of the receiving device lj.

The disadvantage of such a device is the impossibility of adaptive detection of telemeasures of the LECK signals, since the memory connection sequence is specified by the distributor.

The closest in technical essence to the proposed device 30

is a receiving device for a telemetering system, which contains an intermediate memory block (BPP), two digital-to-analog converters DAC} address decoder, electronnd / tuft tube (CRT), subtraction unit, comparison circuit (Cx.C), low-pass filter (LPF), in addition, in each 1 channel, a storage device (memory), an And element, an analog key.

The BPP input is connected to the device input, the first output is connected to the CRT brightness control input, the second from the input of the first PAP, and the third to the inputs of the second DAC and address decoder. The outputs of the latter are connected to the control inputs of the corresponding letters and the first inputs of the corresponding elements And, the outputs of which are connected to the control inputs of the corresponding memory. The memory inputs are combined and connected to the output of the first DAC and one of the inputs of the subtraction unit, and the outputs are connected to the inputs of the corresponding keys, the outputs of which are combined and connected to the second input of the subtraction unit and to the input of the vertical deflection of a CRT beam, the input of the horizontal tonal deflection is connected with the output of the second PAY. The output of the subtraction unit (connected to one of the inputs of the comparison circuit, the output of which connects the second inputs of the elements I.) The outputs of the device are the outputs of the charger and the screen of the CRT 2. The device allows detecting single faults of more than three times the maximum possible change of telemetry processes in the interval approximation. With adaptive time sampling based on zero extrapolation, the magnitude of detectable failures is no less than three times the prediction aperture. The disadvantage of this device is its relative The accuracy of the fault at the output of the low-pass filter will increase, and the minimum level of detectable failures. The aim of the invention is to improve the accuracy of the device. containing information channels, each of which consists of a memory block, an AND element and a key, the output of the AND element is connected to the first input of the memory block, the output of which is connected to the first input of the key, the intermediate memory block, the input to first connected to the device input, the first output through a digital-to-analog converter with the second inputs of the information channel blocks and the first input of the subtractor, the second output of the intermediate memory block is connected to the address of the address decoder, the outputs of which are connected to the first inputs of the AND elements and the second inputs the keys of the corresponding information channels, the outputs of the keys of the information channels are combined and connected to the upstream input of the subtraction unit, the output of which is connected directly to the first input of the cp unit A frequency-voltage converter, an additional And element, and tunable low-pass filters are introduced through the low-pass filter with the second input of the comparator unit, the output of which is connected to the second inputs of the information channel elements and the register unit, the first inputs of which are connected to the outputs of the memory blocks and the outputs to the corresponding inputs of the registration block, the third output of the intermediate memory block is connected to the first input of the additional element I, the second input d is connected to output the comparison unit, and an additional output member through the converter frequency-voltage is coupled to second inputs rearrange ivaemyh lower information channels pass filters. The invention is illustrated by the block diagram shown in the drawing. The receiving device of the telemetering system contains an intermediate memory block (BPP) 1, a digital-to-analog converter (D / A converter) 2, an address decoder 3, in each, information channel 4, an And 5 element, a key b, a memory block 7 and a tunable low-pass filter 8, a filter low frequency 9, an additional element And 10, frequency-voltage converter (VFD) 11, subtraction unit 12, comparison unit 13 and recording unit 14. Block (.BPP) 1 is designed to form a sequence of pulses with a frequency equal to the sampling frequency {third . output) and Calibration of reference codes (first exit) and addresses (second exit). Converter (D / A) 2 is used to form at its output an analog voltage corresponding to the code on the input. The address decoder 3 generates a logical signal 1 at one of its outputs in accordance with the input code. The memory block 7 is designed to store the input voltage at its output, and the memory time is determined by the occurrence of signal 1 at the control first input. Elements 5 and 10 form signal 1 at their output only when occurrence of signals 1 at both of their inputs . Analog switches b are used to transmit the input voltage to its output when a signal is received at the control second input 1. The subtraction unit 7 is used to form the voltage difference between its inputs at its output of the module. Comparison unit 13 generates a signal 1 at the output if the voltage at its second input is greater than the voltage at the first input, otherwise the output signal of the comparing unit 13 corresponds to a logical zero. Low-pass filter 9 is intended for smoothing the sequence of input pulses: the frequency band reproduced by the filter must be substantial. less than the clock frequency of the entire device. At the same time, the transmission coefficient of the low-pass filter 9 must be such that a constant voltage with an amplitude equal to three times the amplitude of the input pulses is formed from the input sequence of identical pulses. This relationship is necessary to detect single sample failures or telemetry signal addresses for adaptive sampling based on zero extrapolation. PNC 11 is designed to form at its output a voltage proportional to the frequency of input voltages. Since the output pulses of an AND 10 element arriving at the input of the PNC 11, appearing on the data receive cycles without failures, the value of the output voltage of the PLA 11 is proportional to on average frequency none:; w; readings of the entire ensemble of telemetry signals. PFNS 8 are designed to smooth the input signals. The limit frequency of the PFNCH varies according to the voltage at their control second inputs: the maximum limit frequency — at the level of the control voltage (which corresponds to a small noise level in the channel) and the minimum cut-off frequency — at a small control voltage. At each moment, the cutoff frequency is set so as to minimize the total error consisting of the error from the limitation of the signal spectrum, the error from the signal delay by the delay time of the PFLS 8 and the smoothed error of the offsets, and with an increase in the pass band of the PFLS 8, the error from the restriction and the error of the trigger decrease A. The smoothed error of failures increases, the total error has a mio.chmum at a certain amount of bandwidth. PFLS 8 bandwidth. PFLS 8 is strictly tuned to Opt-MSh I know the boundary: the frequency is not necessary, since. the losses in accuracy are small, the Multichannel recording unit 14 is used to present the input information in a convenient form for the user and can be, for example, a set of analog indicators or a recorder electron beam tube, etc. The proposed device works as follows. The input information, consisting of a kahad cycle of two parts - the code. addresses and a reference code, goes to the first and second outputs in it: the address code controls the state of the decoder 3, and the reference code in block 2 is converted to the corresponding voltage supplied to the inputs of all the memory blocks 5 and the subtractor 12 The second input of the block 12 comes via the corresponding analog key 6, opened by de ::; by the igniter 3, the output voltage of the specified memory block 7 in accordance with the address code. If the voltage corresponding to the difference in the input voltages and formed at the output of block 12 is less than the voltage at the second input of the comparator unit 13, then the signal NCC 1 at the output of the last remains, resulting in the corresponding element 5 and output voltage CLP2, is remembered by the corresponding memory block 7, and also passes through PFNC 8 to the input of block 14, if the difference modulus is greater than the voltage at the second input of the comparison block 12, then the voltage records of the DAC 2 in the corresponding memory block 7 are not about will failure), and the input unit 14 will remain former voltage zapomnekkoe corresponding memory block 7 in the previous cycle of channel survey. A single fault significantly affects the output level of the low-pass filter 9, so the level of detectable faults remains almost unchanged, TC, and remains until the frequency of faults increases, which occurs with an increase in the probability of a symbol failure in the communication channel. The level of detectable failures will gradually increase up to maxi; .1 the magnitude of the input signal. Alternately, the output voltage of the FNC 11 will decrease as the frequency of the pulses on its code decreases. Correspondingly, the limiting frequency of the PFNC 8 will decrease, i.e., the error from faults will be smoothed to a greater degree, which in this situation exceeds the error from the limitation of the signal spectrum and the delay. Thus o6pcL c: -., The proposed device allows to significantly increase ToviKcci.-b with a large level of poke in the north-west channel. The advantage of the proposed device is also the fact that it has: - a telemetry scanner. - smooth due to the smoothing of the PFCCH. This quality of the proposed device will surely reduce the fatigue of the human operator, - especially under high level conditions in the communication channel , for example in the case of organized interference. isoorenty Receiver, a telemetering device with: .1 a system containing information channels, which consists of a memory block, an AND element and a key.-, an AND element output connected to the first E-hololog-. key, block iO memory. whose entrance is connected to Bho. devices, the first drive - via a digital-to-analog converter with second-I and input blocks of the memory of information channels and the first one; x; o; see the WELCH block, the second output of the intermediate memory block is connected to the address of the address decoder; the outputs of which are connected Displays -gl of the inputs of the elements And and the second inputs of the keys of the corresponding and -information-: channels, the outputs of the keys of the informationformaty: b: x channels are combined and connected to BTOpijT--; the input of the subtraction unit, the output of which is connected directly to the first input of the comparison unit, and through a low-pass filter to the second input of the comparison unit, the output of which is connected to the second inputs of the elements of the information channels, and the registration unit, which is different accuracy of the device, a frequency-voltage converter is added to it, an additional And element, and tunable low-pass filters are introduced in each information channel, the first inputs of which are connected to the outputs of the memory blocks, and outputs - with the corresponding inputs of the registration unit, the third output of the intermediate memory block is connected to the first input of an additional element, the second input of which is connected to the output of the comparison unit, the output of the additional element And through a frequency-voltage converter is connected to the second inputs of tunable low-pass filters info channels.

Sources of information / taken into account in the examination 1. Kornilov, O. A. and others. Multichannel code-impulse telemechanical device MKT-2, - Instruments and control systems, 1972.

2. USSR author's certificate in application No. 2532618 / 18-24, cl. G 08 C 19/00, 09/27/77.

Claims (1)

Claim Reception, my device of a television measuring system containing information channels, each of which consists of a memory block, an And element, and a key, an output of an And element is connected to the first input of the key, an intermediate memory block. the input of which is connected to the input of the device, the first output is through a digital-to-analog converter with the second inputs of the memory blocks of the information channels and the first input circuit of the subtraction unit, the second output of the intermediate memory unit is connected to the input of the address decoder, the outputs of which are connected to the first inputs of the elements' втор and the second key inputs of the corresponding information channels, key outputs of information channels are combined and connected to the second input of the block you7. 771698 8 reads whose output is not connected indirectly with the first input of the comparison unit, and through the low-pass filter with the second input of the comparison unit, the output of which is connected to the second inputs of the elements; and information channels, and the registration unit, characterized in that, in order to improve the accuracy of the device, a frequency converter is introduced into it -voltage, an additional And element, and tunable low-pass filters are introduced in each information channel, the first inputs of which are connected to the outputs of the memory blocks, and the outputs are connected to the corresponding inputs of the registration block, t ety yield the intermediate storage unit is coupled to a first input of the additional AND gate, a second input coupled to an output of the comparator, the output of the complementary element and through transformation. frequency-voltage ”connected³ with the second inputs of tunable low-pass filters of information channels.