SU1249538A1 - Device for estimating amplitude of narrow-band random process - Google Patents

Abstract

The invention relates to computing, namely, devices for estimating the instantaneous amplitude value of the yj complex field, the tea process, and can be used in automatic control and monitoring systems in the presence of a significant level of additive random noise. The purpose of the invention is to improve noise immunity by achieving a sign and a semi-sign correlators, the outputs of which are connected to a computing unit that forms an amplitude estimate, in a device containing a generator of р orthogonal pulse sequences, a calculator and a comparator connected to the input of the device. the form of the partial from the division of the modules of the half-sign correlation coefficients by the sum of the modules of the sign correlation coefficients. 1 il. Wio 4: CO JV ss 00

Description

The invention relates to devices for evaluating the instantaneous amplitude value of a narrowband random process and can be used in automatic control and monitoring systems in the presence of a significant level of additive random yum.

The purpose of the invention is to improve the noise immunity of the device for estimating the amplitude of a narrowband random process.

When creating the device, it was taken into account that the sum of the modules of the sign correlation coefficients of the signal under investigation relative to the orthogonal reference signals is a constant value at a given noise level.

Figure 1 shows the functional

a diagram of an apparatus for estimating amplitude 2 by second, inputs of the first 6 and 8, respectively, of a narrow band random process; on Fig.2 is a structural diagram of the device.

The pulse shaper can be made tunable, which will allow the change (reorganization) of the frequency of the analyzed narrowband random process to be changed.

Shaper forms two ortho25

semi-signed and signed correlators, the second output of the generator 2 orthogonal pulse sequences are connected to the second inputs of the second semi-7 and sign 9 correlators, the outputs of the correlators 6-9 are connected to the inputs of the calculator 3, consisting of adders 10 and 11 and block 12 division .

gonalny, i.e. shifted by 90 one relative to the other, sign (logical) signal

Signed and semi-sign correlators can be implemented with both digital and analog means, however, with a digital implementation, it is easier to ensure the optimal choice of a constant averaging time.

R

1o

if sinujt 0 if sinut 0

(each of the sign correlators forms an estimate, the sign correlation coefficient G, and G, respectively

I

Gg 1 Ss (t) (t) dt

midrange (t) (t) dt.

ABOUT

G. Z: s (4t.) Sgn (x (Ati)) |

1, l P

(Atpx (4ti);

50

In digital implementation, the integrals in the reduced ratios are replaced by sums and the estimates are respectively equal.

G, 2C (it, -) (Ati);

sc

R

sc

Z: c (at, -) x (ti), and

where i 1,2, ..., p;

ut - time-slicing step.

tors when changing (rebuilding) in frequency. Similarly, a computing unit that implements the function of dividing one sum of modules of input signals by another sum of modules can be implemented by both digital and analog means.

The device contains a comparator 1, a generator 2 of orthogonal pulse sequences, a calculator 3, the output of which is the output 4 of the device, the input 5 of which is connected to the input of the comparator 1 and the first (analog) inputs of the first 6 and second 7 semi-sign correlators, the output of the comparator 1 connected to the first inputs of the first 8 and second 9 sign correlators, the first output of the generator 2 is connected to

the second, the inputs of the first 6 and 8, respectively

semi-signed and signed correlators, the second output of the generator 2 orthogonal pulse sequences are connected to the second inputs of the second semi-7 and sign 9 correlators, the outputs of the correlators 6-9 are connected to the inputs of the calculator 3, consisting of adders 10 and 11 and block 12 division .

The device works as follows.

The studied signal x (t) is fed to the input 5 of the device. At the outputs of the generator 2 orthogonal pulse sequence, signals S (t) and C (t) are formed, having the same frequencies and equal to

C (t)

 R

1o

if cos (о t О if cos о t О Semi-sign correlators form estimates of the semi-sign correlation coefficients Rgj. and R

45

R and S (t) x (t) dt;

e.x

Tj. n

C (x) x (t) dt.

Z: c (at, -) x (ti), and

The calculator 3 provides the evaluation operation

amplitude A, which differs from the Actual amplitude value by a scale factor equal to

respectively t

K ;;; 5 (sin (oi) dt o

or with a digital implementation of K S3i: sin (wAti).

Thus, the final estimated

ki is equal to a

to:

Estimates of the coefficients Gg. and G sign correlation modulo is summed in the calculator 3 by the adder 10, which forms the code that serves as the norm for eliminating the influence of interference on the measurement results.

The estimates of the semi-sign correlation coefficients accumulated in the correlators 6 and 7 are modulated in the calculator 3 by the adder 11, and the division unit 12 ensures the generation of the calculator 4 and the amplitude estimator in accordance with the expression:

And JE LLi2% L

lGs, l + / GcJ

Claims (1)

Invention Formula A device for estimating the amplitude of a narrowband random process. 249538  containing a comparator, the input of which is the input of the device, the calculator, the output of which is the output of the device, and the generator of orthogonal pulse sequences, characterized in that, in order to increase noise immunity, it contains the first and second sign correlators and the first and 10 of the second semi-sign correlators, the first inputs of the last two of which are combined with the input of the device. the first inputs of the first and second sign correlators, the first and second outputs of the generator of orthogonal pulse sequences are connected respectively to the second inputs of the First sign and semi-sign correlators and the second inputs of the second sign and semi-sign correlators, while the calculator consists of the first and second adders and the division unit whose output is the output of the calculator, and the first and second inputs of the division block are connected to the outputs of the sum of the first and second adders of the calculator, the inputs of the first and volts cerned terms first adder calculator are respectively connected to the outputs of the first and second correlators iconic, and inputs of first and second terms of the second adder calculator are respectively connected to the outputs of the first and second correlators poluznakovyh.