SU1260978A1 - Correlational extremal system - Google Patents

Abstract

The invention relates to the field of automation, computer technology, radio measuring equipment, to measurements in the field of communication, and can be used in measuring speeds and distances. The accuracy of the system is increased due to the independence of the calculated values of the correlation function from the flow time parameter. The reference voltage generator, the first and second modulators, the phase difference measuring unit, the phase shifter and two adjustable amplifiers are introduced into the correlating 1 sone extreme system. In this case, the regulating parameter — the phase of the reference voltage at the output of the adder is a function only of the delay time between the signals being studied, and the adjustment criterion is the absence of changes in the regulating parameter, which is 4x-switched using the phase difference measuring unit, the output of which controls the extreme regulator . 1 il. with S (L

Description

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The invention relates to automation, computing, radio measuring equipment, measurements in the field of communication and can be used in measuring speeds and distances.

The purpose of the invention is to improve the accuracy of the system. ; The drawing shows a structural diagram of the proposed system

 The system contains the first 1 and second 2 multipliers, respectively, the first 3 and second 4 delay blocks, respectively, the first 5 and second 6 averaging filters, respectively, the adjustable delay unit 7, the reference voltage generator 8, the first 9 and second 10 modulators, respectively , first 11 and second 12 adjustable amplifiers, adder 13, phase difference measurement unit 14, phase shifter 15, amplifier 16, actuator 17, as well as the first 18 and second 19 information inputs of the system.

The accuracy of the operation of the correlation extremal system is increased due to the independence of the calculated values of the mutual correlation function from the current time parameter, which is ensured by the choice of parameter adjustment criteria (the phase of the reference voltage at the output of the adder), which depends only on the time delay between the studied signals .

The operation of the system is based on the following.

If the delay time of the adjustable delay unit 7 of the GR compensates the delay of the signal y (t) relative to the signal x (t), then the values of the mutual correlation functions at the outputs of the averaging filters 5 and 6 change in the same proportion as the appearance or disappearance of the signals x (t) or y (t), which is due to the symmetric arrangement of these values on the time axis with respect to the maximum due to different delay times in 3 and 4 delays and 4 In this case, the delay time of the signal y (t) with respect to x (t) is og, +

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4 9 at the output of the adder 13 remains unchanged in this case, which is used as an adjustment criterion.

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The system works as follows.

To set zero in the absence of signals x (t) or y (t), expose the phase of the signal at the second input of block 14 (for example, F2-16) using the phase shifter 15 so that the analog output of block 14 has a minimum voltage.

Next, the studied signals y (t) and x (t) arrive at the information inputs of the modulators 10 and 9, with the signal y (t) directly, and the signal x (t) through the adjustable delay unit 7. At the same time, at the outputs of modulators 9 and 10, the signals under study are present as envelopes of the reference voltage of generator B (a standard measurement generator, the choice of which is determined only by the necessary reference frequency, which is chosen from a known condition, for generators of type 4-102-e). c, 5 times more than, j ,,). In multipliers 1 and 2, the signal from the output of the modulator 9 and the signal from the output of the modulator 10 are multiplied, respectively, delayed by time T in block 3 (the values and 6 are chosen based on the sensitivity and resolution requirements, since the larger with and the greater the sensitivity and the lower the resolution), and the signal from the output of the modulator 9 and the signal from the output of the modulator 10, delayed by time 1 in block 4 of the delay. From the outputs of multipliers 1 and 2, the signals arrive at averaging filters 5 and 6, respectively. Estimates of the mutual correlation functions of the corresponding signals from the outputs of the averaging filters determine the value of the adjustable voltage at the information inputs of the control amplifiers 11 and 12. Next, the signals are summed in adder 13, from the output of which the total signal goes to block 14, from which the signal enters through the amplifier 16 and the executive body 17 to the control input of the variable delay unit 7.

Claims (1)

Invention Formula Correlation extremal siesta, containing the first and second blocks of delay, the first and second multiplications / The first and second averaging filters, an amplifier, an actuator, an adder and an adjustable delay unit whose input is the first information input of the system, the outputs of the first and second delay blocks are connected to the first inputs of the first and second multipliers, respectively. which are connected to the inputs of the first and second averaging filters, respectively, the output of the amplifier, through the actuator, is connected to the control input of the variable delay unit, which, in order to increase the accuracy Started system incorporated therein first and second modulators, reference voltage generator, the phase shifter, the phase difference measurement unit and the first and second adjustable amplifiers whose outputs are coupled to corresponding inputs of an adder whose output is connected to data input time measuring unit phase, the installation of which is connected to the output of the phase shifter, the input of which is combined with the inputs of the reference frequency of the first and second modulators and connected to the output of the reference voltage generator, the information input of the first modulator is connected to the output of the adjustable delay unit, the information input of the second the modulator is the second information input of the system, the output of the first modulator is connected via the first delay unit with the control input of the first adjustable amplifier and through the second delay unit with the same name Treguliruemogo input of the second amplifier outputs the first and second averaged constituent filters are connected to data inputs of the first and second adjustable usiliteleysootvetstvenno, the output of the second modulator connected to the second inputs of the first and second multipliers respectively. / 9 18 / {t xlt) L.Pchelinska Compiled by E.Efimova Techre M. Khodanych Ko) rector; A.T. Order 5234/51 Circulation 671 Subscription VNII1Sh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4