SU628449A1 - Arrangement for measuring interperiod passive noise correlation factor modulus - Google Patents

Description

The invention relates to the technique of radio exposure and sonar and can be used in pulsed; radar stations with adaptive filters for coherent and weight processing of pulsed signals against the background of passive interference and noise, as well as in radar stations for the selection of moving targets.

A device is known for measuring the passive interference correlation coefficient module comprising a delay line, two phase shifters and a power input unit for evaluating the input process and a divider, the second input of which is connected to the output of the function converter, the first input of the first phase shifter, the line input H 1 and the input of the input process power evaluation unit is interconnected.

However, this device has insufficient measurement accuracy.

The purpose of the invention is to improve measurement accuracy.

For this, the proposed device for measuring the module of the mesa-period correlation coefficient of passive interference introduced two deduction units, two units for estimating the power of uncompensated residuals of the input process, and a calculator, the output of the first phase shifter being connected through serially the first subtraction unit and the first unit for estimating the power of the uncompensated residuals of the input process the first input of the calculator, the input of the delay line through the series-connected second phase shifter, the second subtraction unit and the second power evaluation unit of uncompensated residuals of the input process is connected to the second input of the calculator, the output of the power evaluation unit of the input process is connected to the third input of the calculator, the output of which is connected to the input of the functional converter, and the output of the delay line is connected to the second inputs of the noj.iBoro and BTOpoJo subtractors .

In addition, the units for estimating the mobility of the compensated residuals of the input process and the unit for estimating the power of the input process are separated as a sequence of a square detector and accumulator, and the calculator is executed as a series of the first addition unit of the first unit, the second addition unit, The first and second inputs of the first block 191 are connected to the single inputs of the second subtractor and are the first and second inputs of the calculator, the third input of which is the second the input of the first subtraction unit, and the outputs of the subtraction blocks via quadgers are connected to the corresponding inputs of the second addition unit; the output of the last one is the output of the calculator. The drawing shows the structure of the proposed electrical circuit. A device for measuring the module of the inter-period coefficient of correlation of passive interference contains a delay line 1, two phase shifters 2 and 3, and a unit 4 for estimating the power of the input process. divider 5, functional converter in, two blocks 7 and 8 of subtraction, two blocks 9 and Yu of the power estimate of uncompensated residuals of the input process, calculator 11; blocks 9, 1O and 4 contain a quadratic detector 12 and storage 13, respectively, and the calculator 11 contains the first addition unit 14, the first subtraction unit 15, the second addition unit 16, the second subtraction unit 17, and quadrants 18 and 19. R.P.-P2 .-4th |, y, et.y (R., .P, M.b |, K.cospl

Determining the value of RD ("we get and

)

fP

V

46, Vi "fttr, -Pi) Tjd | 2o (P, .p) T

where

(R2-P)

4T.

then we get expression

{I

4 (3, -P)% - pi

f 2- / GB,

which is realized by the calculator 11, dvvvtv; um 5 in the same converter 6.

Thus, all the basic operations in the device are carried out at the video frequency, which allows

These operations q high accuracy and simple means.

Claims (1)

1. A device for measuring the module of the inter-period coefficient of correlation of passive interference, comprising a delay line, two phase shifters and a sequence of input process power estimation unit and a divider, the second input of which is connected to the output of the functional converter, with the first input of the first phase shifter; The input of the delay line and the input of the input process power evaluation unit are interconnected, characterized in that, in order to improve the measurement accuracy, two subtraction units are introduced. The device works as follows. The levels of uncompensated residuals in the outputs of two frequency-disconnected schemes of the remainder, the interperiod compensation (CSC), and, accordingly, the power of the residuals are determined by the co9 module (} j}) of the correlation initiator, as well as by the Doppler frequency detuning in each of the channels between the average prestltler frequency the fluctuation spectrum and the zero of the frequency response of the PFC circuit, which allows determining the interference correlation coefficient by means of certain transformations of the residuals at the outputs of the PFC circuits. The power of the two non-frequency Doppler FPP circuits uncompensated at the outputs is equal to Ut o00s2 (f, -r, pT 1. "2b 26411-, 005 2ft {P2l ep T -dispersion of the input process; - module of the inter-intercourse correlation coefficient; frequencies corresponding to Zero frequency characteristics of the circuits per-cycle subtraction; Asr mean Doppler frequency of the interference fluctuation spectrum; T, is the pulse follow-up period. The difference and the sum of the uncompensated residuals is d,) (R2L) g -y (G, -G, T ,. two power estimation blocks of uncompensated input residuals besides, the output of the first phase shifter is connected through the first subtractor unit and the transducer; the block estimate of the uncompensated residuals of the input process is connected to the first input, and the delay line is input through the second phase switch, the power block of the power of uncompensated residuals of the input process is connected to the second input of the calculator, the output of the power estimation unit of the input process is connected to the third input of the calculator, the output of the cat cerned connected to the input of a functional transducer and the output of the delay line Cpd | gaen with second inputs of said first and second subtracting units. 2, The device according to claim 1, which means that the power evaluation units of uncompensated residuals of the input process and the power evaluation unit of the Input process are made in the form of sequentially switched quadratic detector and storage device, 3. The device according to 1, is distinguished in that the calculator B1c is filled in the form of a series of first block additions of the first subtraction block, the second block of additions in series, with the first and second inputs of the first addition block having the same inputs the first n second inputs of the calculator, trvtysm input of which is the second input of the first block vpitani, and outputs the subtraction blocks through square-connected to respective inputs of the second adder unit whose output is the output of the calculator. Sources of information taken into account in the examination: 1. Kendall MD, Stuart A. Statistical findings and communications, M., Nauka, 1-. 2, s. 26th, 1973. tCZZlri