SU920738A1 - Multichannel sign correlator - Google Patents

Description

I

This invention relates to specialized computing techniques. ki can be used to construct multichannel correlometers of random stationary ergodic signals with arbitrary splitting laws.

A multi-channel sign correlometer is known, which contains two auxiliary signal generators, a pulse generator, counters, reference elements and a switch divider III.

The disadvantage of this correlometer is the relatively low measurement accuracy.

The closest to the technical unit and the achieved result is a jumper containing switches, auxiliary signal generators, a pulse generator, shift registers, equivalence eqments, counters and comparators. ..

The disadvantage of the known correlometer is not high enough accuracy.

calculating the mutual correlation function.

The purpose of the invention is to improve the accuracy of the correlometer.

The goal is achieved by c. a multichannel sign correlometer containing two auxiliary signal generators, the output of each KOTOpbix is connected to the first input of the corresponding comparator,

10 the second input of each of which is respectively the first and second inputs of the correlometer, the output of the first comparator is connected to the information input of the first shift register, the discharge outputs of which are connected to the first inputs of the corresponding equivalence elements, the second inputs of which are connected to the output of the second comparator, the outputs of the elements equivalences are connected to the first control input of the corresponding reversible counter, counting inputs of reversible counters. control inputs first and second

the shift registers and the second comparator are connected to the output of the clock generator; two inverters, two comparators, two OR elements and a group are entered by the AND element, the first inputs of which are 5

connected to the corresponding bit outputs of the second shift register; the second inputs are connected to the output of the second OR element, whose inputs are connected to the outputs of the second and fourth comparators respectively; the outputs of the first and third comparators are connected to the first and second inputs of the first element OR, respectively which is connected to the information input of the second shift register, the inputs of the inverters are connected to the inputs of the corresponding auxiliary signal generators, and the outputs are connected to the first inputs from responsibly third and fourth comparators, the second inputs of which are respectively connected to first and second inputs of a correlation ,. the control input of the fourth comparator is connected to the output of the clock pulse generator, the outputs of the elements AND of the group are connected to the second control input of the corresponding reversible counter. The drawing shows a structural diagram of a multi-channel analog correlometer. The correlometer contains comparators 1-4, auxiliary signal generators 5 and 6, inverters 7 and 8, elements OR 9 and 1O, registers 11 and 12 shifts, elements 13 of equivalence, group of elements AND 14, reversible counters 15 and generator 16 clock pulses. The investigated random input stationary signals); (tl and (t) arrive at the first inputs of the comparators 1 and 3 and 2 and 4, respectively. The output of the first (second) generator 5 (b) of the auxiliary signal is connected to the second input of the first 1 (second 2 a comparator and an inverter 7 (8) with a second input of the third 3 (fourth 4) comparator. The first input of the first element OR 9 is connected to the output of comparator 1 and the second inputs of the equivalence elements 13, the second input is connected to the output of the comparator 3, and the output is the first inputs of the group of elements And 14. The first entrance to the ele OR 10 is connected to the output of comparator 2 and to the control input of the shift register 12, the second input is connected to the output of comparator 4, and the output

with the control input of the shift register 11, the outputs of which through the elements 14 are connected to the information inputs of the corresponding counters 15.

equivalence cops 13 are connected to the sign inputs of the corresponding counters 15. The output of the generator 16 clock pulses is connected to the counting inputs of the comparators 1 and 3, the shift registers 11 and 12 and the counters 15.

Claims (2)

The correlometer works as follows. The outputs of the register 12 shift through the element. Auxiliary signal generators 5 and 6, respectively, form signals (((t) and gjiCtl. Moreover, the values fi (t) and Chr () are uniformly distributed. Respectively, in the intervals IA, Ol and tB, 01, where fi.1x (t), b , xy (t) In Comparators 1 and 3, the signal x (t) is compared respectively with auxiliary signals qi (t) u) -a, (t) at time points - t L / F, where L is the number of the calculation cycle, f - the frequency of the output pulses of the clock generator 16. From the output of the comparator 1 to the element OR 9 and the second inputs of the elements of equivalence, a signal is sent (0, if .L,., XL, 1 O one value of the comparator 3,, l. P.ecNu, t in the element OR 9 logically adds up to the value of η, and the sum (a -i-fii) arriving at the first inputs of the group of elements And 14 can take only two values, zero or one , since e i gj. In Comparators 2 and 4, the values of | 0, and - are formed, respectively (g 1, essh g. d.-f etNu ID, ecNu where g (t) is g (o in the element OR 10 is forged) the sum (c + c1), the pulses from the generator output 16 clock pulses, arriving at the counting inputs of shift registers 11 and 12 at time ti-, shift their contents by one bit and s credited with the first bits of the respective values (a + c () and G. The output values of shift register 11 i4K and register 12 fdv1p a-l.n where O,, ... (C - i) is the bit number of shift registers 11 and 12, are received respectively at the second inputs of the group of elements And 14 and the first inputs elements 13 equivalence. Values (a; i, ti; + K) P From the output of the corresponding equivalence element 13 are sent to the sign input of the k-th counter 15. This counter works in the addition mode, if P 1, and in the subtraction mode, if; Р O. From the outputs groups of elements and 14 to the information inputs of the corresponding counters 15 are given the values hi ×, I A i + K. If h IK 1, then after the arrival of a clock pulse to the counting input of the k-th counter 15, the plus or minus one is added to the counter depending on the potential at its sign entrance. The zero clock cycle begins after the registers 11 and 12 are filled and the counters are reset and 15. Counts in the st counter 15 form the sum of N- (- To obtain the k-th ordinate of the mutual correlation function of the signals (-fc) and / (trj is sufficient to multiply the value of fJ by a constant coefficient (HL m., - IT I If you want to determine the mathematical expectation of the signals under study, two additional counters must be entered in the correlometer, in which the sums are formed) N-1 / (-) ; proportional to the estimated mathematical expectations of the signals x (i l and (The proposed correlometer, preserving the simplicity of the device, makes it possible to perform calculations of both auto- and cross-correlation functions, and also significantly improves the accuracy of measurements.) Indeed, the variance of the correlation estimate, when calculated, is composed of a dispersion analog evaluation and variable, the main contribution to which makes a member, progortsionalny, the product of the squares of the parameters of the auxiliary signals A and B, since each of these parameters in the proposed correlometer twice than the corresponding parameters of the prototype, the accuracy of calculating the estimation of the correlation function is significantly povyschaets. Claims of the invention A multi-channel sign correlometer comprising two auxiliary signal generators, the output of which is connected to the first input of the corresponding comparator, the second input of each nz of which is the first and second inputs of the correlometer is connected to the information input of the first shift register, the bit outputs of which are connected to the first inputs of the corresponding equilibrium elements, the second inputs of which are connected to the output of the second comparator, the outputs of the elements are equivalent These are connected to the first control input of the corresponding reversible counter, the counting inputs of the reverse counter meters, the control inputs of the first and second shift registers and the second comparator are connected to the output of the clock generator, characterized in that, in order to improve accuracy, two inverters are inserted into the correlometer , two comparators, two OR elements and a group of AND elements, the first inputs of which are connected to the corresponding bit outputs of the second shift register, the second inputs are connected to the output of the second element OR The inputs of which are connected respectively to the outputs of the second and fourth comparators, the outputs of the first and third comparators are connected respectively to the first and second inputs of the first OR element, the output of which is connected to the I11 forma tion of the second input of the second register. the inverter inputs are connected to the outputs of the respective auxiliary signal generators, and the outputs are connected to the first inputs of the third and fourth comparators, respectively, the second inputs of which are connected respectively to the first and second inputs of the correlometer, the fourth input of the comparator, connected to the output of the clock generator, element outputs 9 388. And the groups are connected to the second control input of the corresponding reversible counter. Sources of information that are taken into account during the examination 1. USSR author's certificate No. 304583, cl. G 06 F 15/336, 1871. 2. USSR author's certificate number 752349, cl. G 06 F 15/336, 1978 (prototype).