SU1206829A2 - Device for determining time position of pulse signals - Google Patents

Abstract

The invention relates to the field of telemetry and can be used in telemechanics, radar and long-distance communications. The invention makes it possible to increase the noise immunity of a certain NIN of the temporal position of the pulse signals during the measurement interval determined by the synchronizing pulse. The interference power analyzer 11 evaluates the MOBiHocTH interference acting in the communication channel and when it exceeds

Description

null value. The input signal through key-1 is fed to the primary input of the subtraction unit 2 and the input of the peak detector 8 only for a short time interval, the center of which coincides with the position of the pulse received during the previous measurement cycle, and is determined by the time selector 13. In the event that the permissible value of the interference power does not exceed the signal, the signal of the interfering signal 11 passes through the OR 1b element and opens the key 1 for the total time of the synchronizing pulse entering the inputs of the peak detector 3, trigger 9, And 10 element, selector 13

The invention relates to telemetry and can be used in telemechanics, radio telemetry, long-distance communications, and the like.

The aim of the invention is to increase noise immunity.

Figure 1 is given a structural diagram of the proposed device; in Figure 2 the same, the noise interference analyzer in Figure 3 is the same, the time selector,

A device for determining the pulse pulse pulse time contains an analog switch 1, a subtracting unit 2, a peak detector 3, a differentiating unit 4,, a driver 5 1 pulses, a saw-tooth generator 6, a memory unit 7, an additional device the detector 8, the trigger 9, the element li 10, the analyzer P mopn-usti interference, element 1-XI 12 and the selector 3 time.

Block b is used to generate the voltage of a linearly varying maximum 1-1value to zero for the time corresponding to the possible position of the information W pulse. The block b can be implemented, for example, with the help of the integrator, the output of which is set by a magnetic nanometer. When applied to a logical control input 1.

Unit 7 services are used to transmit the input analog signal of the center on the

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time and power analyzer 11 PoN mechi. When the input voltage of the output voltage of the peak detector 8 is exceeded, the signal from the output of subtraction unit 2 through the peak detector 3, the differentiating unit 4 and the pulse shaper 5 starts the sawtooth generator 6 and sets the trigger 9 to a single state The operating pulse element I 10 triggers and the memory block 7 memorizes the output voltage of the generator 6, corresponding to the temporary position of the input signal of the device. 1 hp f-ly, 3 ill.

2

output and memorize this signal. on the falling edge of the pulse arriving at the control input. Block 7 can be implemented on the basis of a memory capacitor, an analog switch and a buffer amplifier.

Block 8 forms a voltage equal to a part (for example, half) of its maximum

che} n-1 pulses at the input, and can be implemented using a series-connected diode and capacitance; the output voltage is removed from the capacitor through a resistive divider.

Block. 11 solves the following problems: the calculation of interference interference, the comparison of this power with a valid value and the formation of logical 1 at the output if the interference power is less than the permissible power, and O, if it is greater. Block 11 can be constructed as shown in FIG. The unit contains a series-connected mid-square detector 4, an element 15 of comparison, a trigger 6 and 1 aiu 17 of zero potential. The input of the detector 14 is connected to the input of the device, the voltage that corresponds to the permissible value of the interference power in the communication channel is connected to the second input of the element 15, the second input of the trigger 16 and the control input of the detector 14 are connected to

muddy gating pulses.

The rms detector 14 can be implemented by sequentially turning on a quad and an integrator that is to be flushed over the trailing edge of the gating pulse.

The trigger 16 is a D-flip-flop, the first input of which is informational, and the second is controlling. At the falling edge of the strobe pulse, the detector 14 is zeroed and a voltage corresponding to the current power of the interference on the communication channel is generated at the beginning of the next clock; this voltage is compared in the element 15 with a valid one and the result of the comparison is written to the trigger 16. On the leading edge of the strobe pulse, the trigger 16. triggers and the comparison result in the form of a logical signal O or 1 is fixed at its output until the end of the cycle. The permissible interference power - can be determined from the ratio

w - Pc / C2eiu -.

 ln

where P (, is the power of the information pulse;

tolerance 1-gma probability of abnormal error;

c- L KOR

the duration of the time interval corresponding to the possible position of the information pulse (for the duration of the strobe pulse);

1 - interference correlation interval Block 13 serves to generate a pulse whose center coincides with the temporal position of the pulse signal received at the previous clock pulse width is determined by the relation utg where A1My; - the maximum possible change in the temporal position of two neighboring information pulses. The unit 13 can be constructed as shown in Fig. 3 and contains a series-connected saw-tooth generator 18, a reference element 19, an AND element 20, a subtractor 21 j a comparison element 22 and an adder 23 The control input of the generator 17 is connected to the gate pulse bus, the first the input of the subtractor 21 is connected to the output of the generator 17, and

Rac

T i;

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output - to the first input of the element 22, to the second inputs of the blocks 18 and 21 is connected a constant voltage corresponding to the value db, the second 5 inputs of the elements 19 and 22 are connected to the output of the memory block 7, the second input of the And element 20 is connected to the output of the element 22, and the output is to the input of the element OR 12. The generator 17

10 is intended to form at its output a voltage linearly varying from zero to a maximum value during time T, and can be implemented using a torus integrator with a reset; a generator 17 is triggered on the leading edge of the strobe pulses. Blocks 18 and 21 are designed to form a sawtooth voltage shifted

20 respectively up and down on

some lead on the voltage at the output of the FPG 17. Elements 19 and 22 are co-drivers, and for circuit 19 the first input

25 is straight, the second is inverse, while in c.cheme 22 it is vice versa, i.e. evil 19 (22) forms output 1 if voltage is at. the second input of the CCT block 7) is smaller (larger) than the voltage

30 first entrance.

On the leading edge of the gating pulse, the generator 17 is started, at the outputs of blocks 18 and 2 it appears with a saw-tooth voltage, shifting

This is respectively up and down by the value determined by the voltage at their second inputs. At the moment of equality of voltages at the outputs of the adder 18 and memory block 7 at the output

from 1 to 1, and at the time of equality of the voltages at the outputs of the cell 21 and the memory block 7 at the output of the element 18 1 changes to O. At the interval between the first floor and at the output moment of the element 20, 1 is formed, at the rest of the time - ABOUT.

The proposed device for determining the temporal position of the impulse signals operates in the following way.

On the leading edge of the gating pulse, the peak detector 3 is zeroed, the trigger 9 is set to O, and if the current interference power in the communication channel is less than acceptable, then the output of the block P is set to 1, and the key 1 is opened. Esl1g for time

a strobe pulse at the device input does not produce a pulse that exceeds the voltage at the peak detector output: 8, the voltage at the output of block 2 is always negative, the output voltage of block 3 does not change, blocks 4 and 5 have zero output voltages j generator 6 never starts, trigger 9 maintains state O. Therefore, the And 10 element does not trigger on the falling edge of the strobe pulse and the output voltage of the memory block 7 does not change.

If information is transmitted on this one, then the output voltage of block 2 changes sign, which leads to an increase in output voltage of peak detector 3. After differentiation by block 4 and formation by block 5, trigger 9 is set to state 1 and at least a one-time start of the generator 6; And, at the falling edge of the stitching pulse, the element And 10 is activated and the memory unit 7 memorizes the output voltage of the generator 6, corresponding to the temporary position of the input signal of the device.

In the event that the current interference power is more than permissible, the output of block 11 is set to O, the key is open only for a short time interval determined by the selector 13, and the receiving device determines the temporal position of the pulses that appear only in this interval.

Thus, the proposed device fixes the position of the information impulse to the maximum, as well as the known, but more noise-resistant: there is a likelihood of a disturbance being released in the interval ± A1, "; L / T is 24 times less than in the known, and the anomalous error of f-xaxagg and the temporal position is not distributed in the interval 1 2D1mlks (in the well-known - in the interval ± T). Therefore, the rms anomalous error. In the proposed device is less than that known, in CT / 2utMo 1.5 times that soy

for example, with itmojc 0.02 T (1 2%) 125 times.

Claims (2)

1. Device for determining the temporal position of the pulse signals according to auth.St. USSR No. 640350, characterized in that, in order to improve the noise immunity of the device, an analog key, an interference power analyzer, an OR element and a time selector, the outputs of an interference power analyzer and a time selector are connected to the first and second inputs of the OR element, whose output connected to the control input of an analog switch, the output of which is connected to the combined first input of the subtraction unit and the input of the additional peak detector, the signal inputs of the analog switch and the power analyzer the mechs are combined and are the input of the device, the control- and ling inputs of the power analyzer and the time selector are combined and connected to the gate signal, the first and second signal inputs of the time selector are connected respectively to the output of the device and the constant voltage bus. 2. The device according to claim., About tl and - a tem ;, that the power interference analyzer contains the mean squared. The valid detector, reference element, DC voltage and trigger, the output of the RMS detector is connected to the first input of the comparison element, the output of which is connected to the first trigger input, the output of the trigger is an interference power analyzer, the first input of the RMS detector is signal the input of the power analyzer interference, the second inputs of the RMS detector and the trigger are combined and are the control input of the power interference analyzer, the second input of the element is compared coupled with the bus DC voltage. Fig.Z