RU2027318C1 - Parameter measurement method for channels characterized by phase distortions - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: method involves generation of low-frequency component A(t) and radio-pulse component B(t)sinB(t)sinωt comprising test signal, where B(t) is radio-pulse component envelope; t is time; ω is angular velocity; generation of test signal in the form of U_o(t) = A(t)+B(t)sinωt,, and in addition, generation of measurement signals U_k(t) = A(t)+B(t)sinωt+kπ/2, k ∈ 1,3,; test signals are passed through channel and instant values of each of four test signals are measured at channel output and, using these values, envelope phase value of radio-pulse carrier frequency component is found from equations φ = arctg(U_{sin norm}/U_{cos norm}), (1), φ = arctg(U_{cos norm}/U_{sin norm}) (2), where equation (1) is used at U_{cos norm}, other than zero and at U_{cos norm} equal to zero, equation (2) is used. To improve measurement accuracy by reducing test signal sampling error, equation (1) is used for determining envelope phase at /U_{cos norm}/ higher than /U_{sin norm}/ and equation (2) at /U_{cos norm}/ lower than /U_{sin norm}/,; phase envelope values are measured at typical points and unknown value is determined. EFFECT: improved measurement accuracy. 2 cl, 19 dwg

Description

 The invention relates to measuring equipment and can be used to create measuring systems with high accuracy for measuring phase-frequency characteristics and differential phase of the path.

 The purpose of the invention is improving the accuracy of measurements.

In FIG. 1, 2, 3, and 4 are timing diagrams of the signals U _o (t), U ₁ (t), U ₂ (t), and U ₃ (t), respectively, without phase distortion; 5, 6, 7, and 8 are time diagrams of the same signals, but with distortions of the differential phase type; in FIG. 9 is a timing chart of the reconstructed phase envelope of the pulse component of the measurement signal; figure 10, 11, 12 and 13 is the same diagram, but on an enlarged scale; on Fig - time diagram of the restored phase envelope for signals with distortion of the differential phase; on Fig, 16, 17 and 18 is the same diagram, but on an enlarged scale; on Fig - extracted from the signal envelope distortion type differential phase.

 The inventive method of measuring the distortion of the parameters of the paths characterized by phase distortions, provides a definition of the law of the envelope of the phase for each sample of the test signal without the use of the operations of the limitation of the spectrum and phase detection. This eliminates the errors introduced by linear and nonlinear distortions during these operations, eliminates the error caused by the distortion type of differential amplification of the tested path, as well as the influence of the quantization error on the measurement accuracy, thereby achieving the purpose of the invention.

пропускают все четыре сигнала через телевизионный тракт, на выходе тракта измеряют мгновенные значения каждого из четырех измерительных сигналов и по ним определяют значения огибающей фазы радиочастотного заполнения радиоимпульсной компоненты по одной из формул
φ = arctg

(1)
φ = arcctg

(2) где
U_{sin норм}=

U_{cos норм}=

(3)
B(t) =

При U_{cos норм} ≠0 используется формула (1), в противном случае - формула (2).The invention is based on the fact that low-frequency A (t) and radio pulse B (t) sinωt components of the test signal are generated, where B (t) is the envelope of the radio pulse component; t is the time; ω - angular frequency, form a measuring signal in the form
U∂ (t) = A (t) + B (t) sinωt additionally form measuring signals in the form
U _k (t) = A (t) + B (t) sinωt + k π / 2, k ∈

all four signals are passed through the television path, the instantaneous values of each of the four measuring signals are measured at the output of the path, and the envelope of the phase of the radio-frequency filling of the radio-pulse component is determined from them according to one of the formulas
φ = arctg

(1)
φ = arcctg

(2) where
U _{sin norm} =

U _{cos norm} =

(3)
B (t) =

For U _{cos norms норм} 0, formula (1) is used; otherwise, formula (2) is used.

U_{cos норм}

>

U_{sin норм}

находят φпо формуле (1), при

U_{cos норм}

<

U_{sin норм}

находят φпо формуле (2). Измеряют значения огибающей фазы в характерных точках и определяют исковые значения.In order to increase accuracy by reducing the quantization error of the test signal, the following logic is used to select the phase calculation option:

U _{cos norms}

>

U _{sin norms}

find φ by the formula (1), for

U _{cos norms}

<

U _{sin norms}

find φ by the formula (2). The phase envelope values at characteristic points are measured and the claim values are determined.

Claims (1)

1. METHOD FOR MEASURING DISTURBANCES OF PATTERN PARAMETERS CHARACTERIZED BY PHASE DISTORTIONS, in accordance with which low-frequency — A (t) and radio-pulse — B (t) sinωt components of the test signal are generated, where B (t) is the envelope of the radio-pulse component - angular frequency, form a test signal in the form of:
U _o (t) = A (t) + B (t) sin ωt,
they pass it through a controlled path, measure the phase envelope at characteristic points and determine the desired parameter values, characterized in that, in order to improve the measurement accuracy, test signals are additionally generated in the form of:

pass through the path, at the output of the path, instantaneous values of each of the four test signals are measured and the envelope of the phase of the radio-frequency filling of the radio-pulse component is determined from them according to the formula:

at U _{c o s н о р м} ≠ 0 or

at U _{c o s н о р м} = 0,
Where

2. The method according to p. 1, characterized in that, in order to increase accuracy by reducing the quantization error of the test signal, to determine the values of the phase envelope using the formula

at

at

.

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