SU1310868A1 - Method and apparatus for transmission of telemetering signals - Google Patents

Abstract

The invention relates to the field of telemetry and can be used to transmit information over wired lines, radio links, and the following: and transmission of information is achieved by expanding the spectrum of interference in one run; the frequency spectrum of the last signal by multiplying each pulse of the input message by a pulse whose polarity is random. At the receiving side, this purpose uses an inverter 2, a switch 3, a random sequence generator J keys 9 j; -10, and elements 5-8 for shunting. At the receiving side 12, with the aid of a co-driver of device 2., inverter 19, switch 20 to trigger 13, the received signal is transmitted to the corresponding pulses of a random sequence. In the case of interference, the frequency band of the interference broadens j, which reduces its power in the frequency band of the useful signal 1.e 1 ifi. j, .-: ™ ,, S--, U ™ J. „.- Ь ™„ ™ I L -, - ™ .. i .-. ™ .JT -j L ™ -.- ..-, j. .. ™ ,. r- ™. rl-C U 74 U 0- / if j

Description

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The invention relates to: telemetry and can be used to transmit information over a wired line Md radio links and, in the conditions of interference with an unknown correlation function, in particular for narrowband interference.

The purpose of the invention is to increase the noise immunity of information transmission by expanding the interference spectrum.

The drawing shows a functional diagram of the device.

The device contains on. to the transmitting side 1 inverter 2, switch 3, generator 4 random sequence, generator 5 clock pulses, distributor 6 pulses, sum

Matrix 75 driver 8 sync signals, the first 9 and second 10 keys. The device also contains a communication channel 11 and at the receiving side 12 contains a trigger 13, a clock selector 14, a clock generator 15, a pulse distributor 16, keys 17, filters 18, an inverter 19 and a switch 20, a comparator 21

The device works as follows.

The pulses of the generator 5 are fed to the distributor 6, on the codes of which alternately signals appear and the corresponding key 95 connects the first input of the switch 3 and the input of the inverter 2 to one of the continuous input signals (t, e, in accordance with the proposed method sampling the input continuous signal and the formation of an amplitude modulated pulse),

The first in each polling cycle closes the ID key connected to the second input of the device.

At each transmission cycle, the generator 4 is also started, at the output of which a signal O or 1 randomly appears (forming a binary random sequence of pulses). When the signal O appears during the entire cycle, the input of the dryer 7 through the switch 3 receives a signal from the combined output keys 9, at the occurrence of signal 1, keys 17 divide the received group pfm signal into channel signals (discrete sequences), which are converted into analog signals in recovery filters 18 (i.e., each The m channel resulting from multiplying the received sequences of sequences of pulses is converted into a continuous process). The signals are fed to the inputs of filters 18, which suppress noise, the spectrum of which is outside the frequency band of the useful signal (i.e., a restored continuous input signal in each measuring channel is obtained by filtering)

The discrete noise of the communication channel, contained in the received sequence of JQ pulses, after multiplying by the pulses of a random sequence, becomes uncorrected noise, the band of which is evenly distributed in the frequency range from the inverter output 2 (t, e, realizes to the sampling rate and poetos elementwise multiplication of two sequences of pulses). At the output of the adder 7, an amplitude-modulated sequence is generated.

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pulses of all channels plus a sync pulse (from driver 8), i.e. Group AI1 1-signal entering the channel 11 of communication. Here an additive interference is added to the useful signal.

At the receiving side 12, the received PAM signal is fed to the inputs of the comparator 21, the inverter 19 and the first input of the switch 20. Comparator 2 compares the input signal with a zero level and, in the case of overshoot, outputs signal 1 at the output (O otherwise)

At the first cycle of each reception of the group signal, a sync pulse from the distributor 16 arrives at the synchronous input of the trigger 13 and the trigger 13 stores the output state of the comparator 21 for the entire current reception cycle, and the switch 20 outputs the output from the input or output of the inverter 19 during the entire current reception cycle (i.e., the received amplitude-modulated received pulse train is element-wise multiplied by the received sequence of binary random pulses).

The keys 17 divide the received group PAM signal into channel signals (discrete sequences), which in the restoration filters 18 are converted into analog signals (i.e., in each measuring channel, the pulse sequence obtained by multiplying the received sequences is converted into continuous process). The signals are fed to the inputs of filters 18, which suppress noise, the spectrum of which is outside the frequency band of the useful signal (i.e., a restored continuous input signal in each measuring channel is obtained by filtering)

The discrete noise of the communication channel, contained in the received sequence of Q pulses, after multiplying by the pulses of a random sequence, becomes uncorrected noise, the band of which is uniformly distributed in the frequency range from 0 to 0.

The frequency band of the useful signal is small in its power, which increases the noise immunity of information transmission.

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Claims (2)

1. A method for transmitting telemetric signals, comprising: on the transmitting side the discretization of the analog telemetric signal to a sequence of amplitude-modulated pulses and transmitting it over a communication channel; on the receiving side, a sequence of amplitude-modulated pulses is received and filtered, characterized in that, in order to increase the noise immunity of the transmission of a body of metric signals, on the transmitting side simultaneously with the sampling of analog telemetry A random signal of different-polarity pulses is formed at the signal, which is transformed into a random sequence of pulses by multiplying each pulse of a sequence modulated in amplitude by a corresponding pulse of a random sequence of different polarity pulses and transmitting a random sequence of pulses through the communication channel simultaneously with the transmission of a sequence of amplitude-modulated pulses , on the receiving side receive a random sequence of impu before filtering, the original telemetric signal is restored by multiplying the like pulses of received sequences, 2. A device for transmitting telemetric signals, which contains on the transmitting side the first keys, the first inputs of which are the first inputs of the device, a clock generator, the output of which is connected to the input of the pulse distributor, the first outputs of which are connected to the second inputs of the corresponding first keys, the outputs of which are volume editors N.Gorvat Compiled by V. Borodin Tehred M.Hodannch Proofreader N.Povydychik Order 1896/48 Circulation 544 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul, Proektna, 4 08684. . dinene, the second output of the pulse distributor is connected to the first input of the adder, the output of which is connected to the input of the communication channel, on the receiving side, the device contains a clock selector, the input of which is connected to the output of the communication channel, the output of the clock selector through the clock generator connected to the input of the pulse distributor, the first outputs of which are connected to the first inputs of the corresponding switches, the outputs of which are connected to the inputs 15 of the corresponding filters, the outputs of which are the outputs of the device, characterized in that, in order to improve the noise immunity of telemetry transmission; 20. On the transmitting side, a second switch, an inverter, a switch, and a case sequence generator are introduced; the third output of the pulse distributor is connected to the first input of the second  a key whose output through the inverter is connected to the first input of the switch, the second input of which is connected to the combined outputs of the first and second keys, the second output of the distribution of pulse bodies is connected to the input of a random sequence generator whose output is connected to the third input of the switch, the output of which is connected to the second input the accumulator, the input of the Second key is the second input of the device, an inverter, a comparator, a trigger and a switch are entered on the receiving side, the output of the communication channel is connected to the first input of the com mutator and, respectively, through an inverter and comparator connected to the second input of the switch and the first input of the trigger, the second input of which is connected to the second output of the distribution of pulses, the output of the trigger is connected to the third input of the switch, the output of which is connected to the second inputs of the keys.