PARAMETER MEASUREMENT METHOD FOR CHANNELS CHARACTERIZED BY PHASE DISTORTIONS Russian patent published in 1995 - IPC

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_sinnorm/U_cosnorm), (1), ϕ = arctg(U_cosnorm/U_sinnorm) (2), where equation (1) is used at U_cosnorm, other than zero and at U_cosnorm 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_cosnorm/ higher than /U_sinnorm/ and equation (2) at /U_cosnorm/ lower than /U_sinnorm/,; phase envelope values are measured at typical points and unknown value is determined. EFFECT: improved measurement accuracy. 2 cl, 19 dwg