SU1267460A1 - Method and apparatus for transmission of telemetering information - Google Patents

Abstract

The invention relates to telemetry and can be used when transmitting information about slow-moving parameters. The invention improves the accuracy of information transfer. The method consists in generating reference signals with different constant amplitudes within the variation of the amplitude of the information signal, comparing the information signal in amplitude simultaneously with each reference signal and at the instant that the amplitude of the information signal coincides with the amplitude of one of the reference signals forming a control signal and transmitting it to the communication channel. Simultaneously with the comparison of the information and reference signals, a difference signal is periodically generated, the amplitude of which is equal to the difference of the amplitudes of the information signal and the nearest smaller reference signal, and the generated difference signal is transmitted to the communication channel. A device with (L holds information channels, each: of which is made on the subtractor, threshold element, pulse shaper and key, source of reference signals, AND elements, OR elements, analog-digital converter, IND trigger and clock pulse generator. 3 Il. 2 sp.f-ly. 4ik O)

Description

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The invention relates to telemetry and can be used in the transmission of information about slow-moving parameters.

The purpose of the invention is to improve the accuracy of information transfer.

Figure 1 shows the structural diagram of the device; Figures 2 and 3 are timing diagrams explaining the operation of the method and the operation of the device.

The device contains (Fig. 1) information channels 1-3, each of which is made on a subtractor 4, a threshold element 5, a pulse shaper 6 and a key 7, a source of 8 pillars, first, second elements OR 9 and 10, analog digital converter 11, trigger 12, generator 13 clock pulses, the first and second elements And 4 and 15.

The method of transmitting information is that they form a grid of reference signals with different constant amplitudes within the variation of the amplitude of the information signal. The amplitude information signal is compared simultaneously with each reference signal, and at the instant that the amplitude of the information signal coincides with the amplitude of one of the reference signals, a pilot signal is generated and transmitted to the communication channel. Simultaneously with the comparison of the information and reference signals, periodically form a difference signal, the amplitude of which is equal to the difference of the amplitudes of the information signal and the nearest smaller (or larger) reference signal. A generated differential signal is transmitted to the communication channel.

The device works as follows.

The information signal from the sensor (Fig. 2a) is fed to the inputs of the subtractors 4 and is compared with the threshold signals (A, 2A, 3A), acting on the other inputs of the subtractors 4. At the output of the subtractors 4, a difference signal is generated (Figs.2c, d) . Upon reaching the signal from the outputs of the subtractors 4, the value exceeds the threshold of the threshold element 5 (the threshold is set based on the required measurement accuracy of the measured parameter), the latter generates a signal (e, f, f) that goes to the inputs of the drivers 6 of pulses and control inputs 674601

key switches 7. The signals (d, e, g) from the outputs of the elements 5 control the keys 7, the information inputs of which are connected to the outputs of the subtractors 4. The keys 7 are open when their control inputs (e, g) are low potential and closed when a high potential signal acts on these inputs,

o Signals (b, c, d) pass through public keys 7 and arrive at the input of the element OR 9, which combines the output signals (r, h, i, k) and the combined signal (l), is fed to

5 input analog-to-digital converter 1 1, which converts the input signal into a code. The conversion of the input signal into the code analog-to-digital Converter 11 performs with

Q pulse frequency (s) at its control input from the generator 13 clock pulses. Through the element OR 10, the signal enters the counting input of trigger 12 and changes it

5, the initial state (p) characterizing the value of the check bit (f). The outputs of the analog-digital converter 11 and the trigger 12 (y, f) are interrogated by pulses (t) arriving at the second inputs of the elements 14 and 15 from the generator 20 clock pulses.

As a result, if the parameter, increasing or decreasing, takes a value from another subband, then the value of the control rae, row, changes. At the same time, if the received value is greater than the previous one, then the parameter decreases, if the accepted value is less than the previous one, its value increases.

Thus, the proposed simulation implements a zero order predictor algorithm with fixed | Noah aperture and transmits the value of the information signal increment inside each fixed appr, which increases the accuracy of the transmitted information

Claims (2)

1. A method of transmitting telemetry information, which consists in generating reference signals with different constant amplitudes within a change in the amplitude of an information signal, compares the information signal in amplitude simultaneously with each reference signal and at the instant that the amplitude of the information signal coincides with the amplitude of one of reference signals form a control signal and transmit it to the communication channel, characterized in that, in order to improve the accuracy of information transfer, simultaneously with the comparison of information rmatsionnogo and reference signal are periodically generating a residual signal whose amplitude is equal to the difference of the amplitudes of the information signal and the nearest lower reference signal, and transmitting the generated difference signal to the communication channel. 2. A device for transmitting telemetric information containing the elements OR, an analog-digital converter, a generator of clock pulses and a threshold element and key in each information channel, differing in the fact that, in order to ensure the accuracy of the device, a source of reference signals is entered into it , trigger, elements And in each information channel-subtractor and pulse shaper, the output of the subtractor is connected to the input of the threshold element, the output of which is connected to the input of the pulse former and the control input of the cell Here, the information input A604 of the key of each previous information channel is connected to the output of the first reader of each subsequent information channel, the output of the subtractor of the first information channel and the outputs of the keys of all information channels are connected to the corresponding inputs of the first OR element, the output of which is connected to the information input of the analog-digital converter, the outputs of which are connected to the first inputs of the corresponding first elements And, the outputs of the source of the reference signals are connected to the first inputs and subtractors of the respective information channels, the second inputs of which are combined and are the device input, the outputs of the pulse drivers of the information channels are connected to the corresponding inputs of the second OR element, the output of which is connected through a trigger to the first input of the second element And with the control input of the analog-digital converter and the second inputs of the first and second AND elements, the outputs of the first and second AND elements are co respectively first and second outputs of the device. and m FOR 2A eight y d e Well 3 and Fi9. 2 ::: N, I I t one iiiiniiinmnininiuiiinn iniinHHIIIIIIIillllHIIIIItl . . i -Jiit " -Lt JIUJL li.ii. JJt HI11 "" fig 3