SU714457A1 - Telemetering system receiver - Google Patents

Description

(54) RECEIVING TELE-MEASUREMENT SYSTEMS

The device belongs to the information-measuring technology and can be used in telemetry, as well as in communication systems, teleconsults of Yuni and others. HsJBecTHa is a telemetric system in which zero extrapolation is performed on the basis of discrete counts of telemetry signals. The receiving device of this system contains in each channel a serially connected digital back-up device and a diffraction-analog converter. The information inputs of the storage device are connected to the output of the intermediate memory block, and the control inputs to the corresponding outputs of the distributor connected to the output of the synchronous-gall block, the input of the intermediate tmsm block is connected to the output of the decoder, whose input along with the input of the sync signal connected to the input of the receivers of the device 11. The disadvantage of this device is the impossibility of adaptive polling of measured signals, since the connection sequence is remembered. the device is assigned by the distributor. The closest in technical essence to this is the cHCTeNoa telemetric receiving device containing an intermediate block. This input is connected to the input of the device, the first output is connected to the control input power of the cathode-ray tube, the second output of the intermediate memory unit is connected via the first digital-to-analog converter to the input of the horizontal beam deflection. a single beam tube, the third output of the intermediate memory block is connected to the input of a digital-to-analog converter (.2. The device has a low noise immunity because the adpec or count codes fail to correct, which leads to display and lockout on the screen of the electron beam tube (CRT) false information.

The aim of the invention is to improve the noise immunity of the device.

This is achieved by inserting an address, a subtractor, a comparison unit, a low-pass filter and information channels made on the memory block, the AND element and the key into the device, the first inputs of which and the AND element of each information channel are connected to the corresponding address decoder, input which is connected to the second output of the intermediate memory block, the output of the second digital-to-analog converter is connected to the first input of the subtractor and to the first input of the memory block of each information channel In each of which the output of the element I is connected to the second input of the memory block, the input of which is connected to the second input of the key, the outputs of the keys of the information channels are connected to the input of the vertical deflection of the cathode ray tube and the second input of the subtracter, the upstream of which is connected to the first input of the unit comparison 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 information channel keys.

, The block diagram of the device shown in the drawing.

The receiver 5 of the telemetering system contains a block of 1 spacing, digital-to-analog converters 2 and 3, a decoder of 4 dresses, blocks of 5 memory, elements AND 6, keys 7 of the electron-beam tube 8, block 9 of subtraction, block 10 of comparison, filter And low frequencies.

The intermediate memory unit 1 is designed to control the strength of the electron-beam tube 8 and form the reference codes of the address. The control of the luminosity of the tube 8 is necessary for displaying points on the screen only after the end of the transient processes (change of the codes of the rt reference address). Converters 2 and 3 serve to form at their outputs an analog voltage corresponding to the code on the input. The address decoder 4 generates a logical signal 1 at one of its outputs in accordance with the input code; memory blocks 5 are designed to store at its output an input

voltage, the memorizing time being determined by the occurrence of signal 1 at the control input. Elements b and b form their output signal 1 asp at the appearance of signals at both of their inputs. The keys 7 are designed to transmit the input voltage to their output when a signal I appears at the control input. The electron beam tube 8 serves to display on the screen a point whose deviation in the horizontal and vertical directions relative to the zero position is proportional to the voltages applied to the inputs respectively, the horizontal and vertical deflection of the beam. The luminosity of the electron-beam tube 8 is regulated by the voltage at the corresponding input, in this device the brightness control is binary (the beam is completely closed or fully open). Block 9 of the subtraction is designed to form at the output of the module the difference of voltages found at its two inputs. Comparison unit 10 generates a signal 1 at its output if the voltage at its second input is greater than the voltage at the first input, otherwise the output signal of unit 10 corresponds to a logical zero. The filter 11 is designed to smooth the sequence of input pulses; the band of reproduced frequency filters 11 must be substantially less than the clock frequency of the entire device (input information refresh rate). In this case, the transmission coefficient of the filter 11, as the analysis shows, 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. Such a relation is necessary for the detection of single sample failures or addresses of telemetry signals with adaptive sampling based on zero extrapolation.

The device works as follows.

Claims (2)

1. B. Kornilov, et al., Multichannel Co-Pulse Telemechanical Device MKT-2, Instruments and Control Systems, N 11, 1972., ( 2. Temnikov F. Ye., Et al. Theoretical Foundations of Information Technology, Moscow, Energie, 1971, p. 398 (prototype). ..i, -ittJli3i: iiJ4, J-ji i; iiUSWj., -...;.