SU1133612A2 - Adaptive telemetric system - Google Patents

Abstract

ADAPTIVE TELE-MEASURING SYSTEM according to ed. St. No. 951362, characterized in that, in order to improve the noise immunity of the system, a serially connected pulse counter, a digital-to-analog converter and an amplifier are introduced into it, the pulse counter input is connected to the decoder output, and the amplifier output is connected to the transmitter input.

Description

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The invention is related to telemechanics and can be used to collect and process marine geophysical data.

According to the basic arjT, ev, no. 951362, an adaptive tele-measuring system is used, which is used to collect and process data from marine geophysical studies. This system contains in series a sensor unit, an amplifier unit, a filter booster, a switch and an analog-to-digital converter, the output of which is connected to the input and through a computing unit to the first input of the decoder, the second input of the decoder is connected to the first one. to the input of the code converter and through the memory unit to the data recording unit, the output of the decoder is connected to the first input of the key block and through the discrete automatic gain control unit to the first input unit and amplifiers, the output of the converter, and through a relatively phase modulator, is connected to the second input of the amplifier unit, the output of which is connected to the Bory & -1 -1 input of the key block and the input of the key block via a linear adder connected to the information side transmitter input.

Such a system allows the frequency band occupied by the generated radio signal 5 to be kept at a minimum, with a change in M transmission rate. This is achieved by automatically changing the base of the 1 J manipulation code.

However, as the base of the signal manipulation code increases in proportion to its reception noise immunity 21, it decreases.

The aim of the invention is to improve the noise immunity of the adaptive telemetering system.

The goal is achieved by the fact that a pulse counter connected in series, a digital-to-analog converter and an amplifier are inputted into an adaptive tele-measurement system, the pulse counter input is connected to the output of the decoder 3 and the amplifier is connected to the control output of the transducer.

The drawing shows a structural block diagram of an adaptive telemetering system 36122

The system contains a block of 1 sensors, a block of 2 amplifiers, a block of 3 filters, a switch 4, an analog-to-digital converter (LIP) 5, a computing block 6 (reference block), a block 7 of data recording, a controlled formatter 8 containing a decoder 9, a register 10 and a memory unit 11, an adaptive multipoint diode modulator 12 containing a code converter 13, a relative phase modulator (OFM) 14, a block 15 of a power bungler, a block 16 keys, a linear s {mat 17, filter 18 one side strip and block 19; 1 discrete automatic gain control

5 (GIFT) 5 transmitter 20, counter 21 yes-1 pulses 5 digital-to-analog converter (D / vn) 22, amplifier 23.

The system works as follows. T ()

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Analog signals from the sensor unit 1 through 2 amplifiers, the filter unit 3 and the switch 4 substages. on ADC 5 Here there is a uniform continuous discretization of analog signals with the lowest {incremental discretization step and the largest number of binary bits P of the recorded words. Further, the full flow of data is fed to the information

0 is an input of the register 10 of the controlled for-f matter 8 and to the comparison unit 6, analyzing the characteristics of the received signals and determining the coding parameters. Digital codes of registration parameters are fed to the depositor 9 of a controlled formatter 8, here codes convert the SI into control signals of register shreds 10, so that its input sets the values of the registration parameters corresponding to the 1st calculations in block 6, i.e. adaptive sampling occurs. Next, the compressed data stream arrives at

5, the memory block 11 and, if necessary, is transferred to it on the magnetic tape of the block 7. The stream of data from the register 10 is in the form of an N-bit binary code (the size of which can

0 to vary from data density dependency to data) also goes to the information input of the adaptive multi-point modulator 12, which forms the N-bit code words coming from register 10 of the controlled formatter 8, into M-bit combinations of the parallel binary code . Bit depth pa311

parallel binary code formed in the converter code 13, is determined by the ratio

log.N

M 1

2 mpn

The incoming data stream is written to the code converter 13 at the maximum speed, and if, in all M bits of the code converter 13, the same symbol is written, when M characters are written from the MV LU From the output of the 13 kTmsL converter.

Yes, the data stream goes to the OFM 14, which forms the M signals of the OFM supplied from its output to the information input of the amplifier block 15, the gain of each of which K is set by control signals from the DAR unit 19, the output of which is connected to the control input of the block 15 amps.

The control signals from the decoder 9 of the controlled formatter 8 are also fed to the control input of the key block 16, which is connected to the output of the decoder 9. The information inputs of the keys of the block 16 are fed from the outputs of the amplifier block 15. The control signals from the decoder 9 of the controlled formatter 8 change the number of public keys in block 16. At the maximum transfer rate, all M keys of block 16 are open. If the transfer rate is minimal, one key is open. In this way, the base of the output manipulation code is controlled depending on the transmission rate.

From the output of the 16 keys block, the signals are fed to a linear adder 17, in which a multi-position radio signal is generated with amplitude-phase modulation (AFM), and from its output an AFM signal is fed to the information input of the transmitter 20, the gain factor of which is controlled by the voltage applied to the control input transmitter 20 from the amplifier output 23. The input signal is fed to the amplifier 23 from the digital-to-analog converter 22. The voltage generated by the digital-to-analog converter 22 is proportional to the number of control their pulses from the decoder 9 formatted formatter 8, on

3612. 4

Counter 21 pulses and a block of 16 keys. The number of control pulses posited from the decoder 9 of the controlled formatter 8 is counted by a pulse counter 21 included between the output of the decoder 9 and the input of the digital-to-analog converter 22.

Thus, with increasing

The Q data flow rate from register 10 increases the code word width, and the number of pulses arriving in parallel from decipher 9 to unlock the keys of block 16 increases to 1 to M-1. The number of these pulses is counted by a pulse counter 21, which inputs this number into a digital-analogue trans. the distributor 22, which forms a voltage proportional to this number, which is amplified by the amplifier 23 and is given to the control electrodes of the radio section of the transmitter 20,

- by increasing the gain of the radio path of the transmitter 20, and consequently, the power radiated by the transmitter 20 is proportional to the increasing base of the manipulation code t, which allows for maximum noise immunity of reception, corresponding to any transmission rate (for any basis of the manipulation code from m 2 to

GU P

   + 1 ° P2 P1a) With a decrease in the transmission rate and, consequently, the base of the manipulation code t, the voltage at the output of the DAC 22, the gain of the radio path of the transmitter 20 and its radiated power decrease.

Thus, in the proposed system, when the transmission rate changes due to the automatic change of the base of the manipulation code in the adaptive multi-position modulator, the minimum remains unchanged at the signal frequency band, and due to the automatic increase of the transmitter radiated power with increasing the base of the manipulation code

about

the maximum noise immunity is guaranteed to be consistent with the transmission of the OFM signals s1.

Using such a system allows you to keep a minimum bandwidth.

transmitter radiation and the required

noise immunity at varying

transfer rates that contributes

St1336126

a more efficient use of the radio transmission capacity and the provision of a radio channel, ensures the reception of telemetry information, and a solution to the problems of electromagnetism with the required noise immunity.

Claims (1)

ADAPTIVE TELEMETRIC SYSTEM by ed. St. No. 951362, characterized in that, in order to increase the noise immunity of the system, a pulse counter, a digital-to-analog converter and an amplifier are introduced into it, a pulse counter input is connected to the decoder output, an amplifier output is connected to the transmitter input 1 1 1