SU1350828A1 - Adaptive follow=up filter - Google Patents

Abstract

This invention relates to radio engineering and provides improved filtering accuracy. The adaptive servo filter contains a block of I subtraction, adjustable amplifiers 2, 9, low pass filters 3.8, multiplier 4, integrator 5, and double gates 6. To increase accuracy, blocks 4, 5, 6 are entered. 1 Il. She ate 30 HS X)

Description

The invention relates to radio engineering and can be used in radio automation systems and measurements.

The purpose of the invention is to increase the filtration accuracy.

The drawing shows a structural electrical circuit of an adaptive tracking filter.

The adaptive tracking filter contains the first subtraction unit, the first adjustable amplifier 2, the first low pass filter 3, the multiplier A, the integrator 5, the double sided limiter 6, the second subtractor 7, the second low pass filter 8, the second adjustable amplifier 9.

Adaptive servo filter works as follows

The input of the first subtraction unit 1 is the process y (t) A + n (t), where A, n (t) is the information and noise components. If the operator coefficients of transfer K (p) of the first

and a second low pass filter 3.8, 25 subtracting, different

as well as the gain factors K of the first and second adjustable amplifiers 2j9 are equal, then the output process, multiplier 4 is equal to

and (y) r p (v d

 -T + to -cGr7

) J,

 , d - the process at the output of the first low-pass filter 3, and determines the discriminatory characteristic of the discriminator of the control circuit. The mathematical expectation of a process is described by the relation, -; 1 7 K (ju)) (l + KK (ju)).

 - 25fi GT + kkTZ: 1) 1 dg I ak

where Sy (ao), O - spectral density (t)

the process

and dispersion by E.Borisov, Compiler C, Patrusheva Tehred M. Khodich Corrector A.T.

5298/57

Circulation 900 Subscription

VNIIPI USSR State Committee

on d "1lam inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, d.4 / 5

.Production and printing company, Uzhgorod, Projecto st., A

The process at the output of the first subtraction unit 1,

Discriminatory characteristic. Has a point of stable equilibrium at K K

ab (to dK

five

0

where KQ meets condition K) O, which corresponds to

a minimum of filtering error at the output of the first subtraction unit 1 and, therefore, the adaptive tracking filter. Such a value of K is set immediately after the filter is turned on and adjusted when the parameters of the input process change.

Claims (1)

Invention Formula An adaptive tracking filter comprising a first subtractor unit connected in series, a first adjustable amplifier and a first low pass filter, the output of which is connected to another input of the first block In order to improve the filtration accuracy, a serially connected multiplier, the first input of which is connected to the output of the first subtraction unit 0, an integrator and a two-way limiter whose output is connected to the control input of the first adjustable amplifier, and the serially connected second subtraction unit, are introduced; the input of which is connected to the output of the first subtraction unit, the second low-pass filter, the output of which is connected to the second input of the multiplier, and the second regulator amplifier, the control input of which is connected to the output of the double-sided limiter, and the output is connected to the second input of the second subtraction unit.