SU1273952A1

SU1273952A1 - Correlation meter of time shift

Info

Publication number: SU1273952A1
Application number: SU853918526A
Authority: SU
Inventors: Игорь Иванович Волков; Валерий Константинович Семенычев
Original assignee: Куйбышевский ордена Трудового Красного Знамени политехнический институт им.В.В.Куйбышева
Priority date: 1985-06-28
Filing date: 1985-06-28
Publication date: 1986-11-30

Abstract

Изобретение откоситс к области специализированных средств вычислительной техники, предназначенных дл измерени временного сдвига двух случайных сигналов, может быть использовано в радиодальнометрии, диагностике механического оборудовани , автоматике . Введение двух фильтров нижних частот, блока усреднени , блоков вычитани , установление новых св зей между ними позволило повысить точность измерений временного сдвига при любых видах коррел ционных функций анализируемых сигналов. 1 ил. The invention deviates to the field of specialized computer equipment for measuring the time shift of two random signals, can be used in radio-frequency gauge, mechanical equipment diagnostics, automation. The introduction of two low-pass filters, an averaging block, and subtraction blocks, the establishment of new connections between them, made it possible to improve the accuracy of time shift measurements for any kinds of correlation functions of the analyzed signals. 1 il.

Description

Изобретение относится к специализированным средствам вычислительной техники, предназначенным для измерения временного сдвига двух случайных сигналов, и может быть использовано при обнаружении сигналов корреляционным способом на фоне помех, в радиодальномётрии, при диагностике механического оборудования, измерении параметров движения изображения.The invention relates to specialized means of computer technology, designed to measure the time shift of two random signals, and can be used to detect signals in a correlation way against interference, in radio rangemetry, in the diagnosis of mechanical equipment, and measurement of image motion parameters.

Цель изобретения - повышение точности.The purpose of the invention is improving accuracy.

На чертеже изображена структурная схема предлагаемого измерителя.The drawing shows a structural diagram of the proposed meter.

Измеритель содержит второй и пер- 15 вый фильтры 1 и 2 нижних частот соответственно, блок 3 регулируемой задержки, второй блок 4 вычитания, второй блок 5 усреднения, третий блок 6 вычитания, первый и второй блоки 7 и 8 умножения, первый блок 9 вычитания, первый блок 10 усреднения , усилитель 11, первый и второй информационные входы 12 и 13. Измеритель работает следующим образом.The meter contains a second and first 15 low-pass filters 1 and 2, respectively, an adjustable delay unit 3, a second subtraction unit 4, a second averaging unit 5, a third subtraction unit 6, a first and a second multiplication unit 7 and 8, a first subtraction unit 9, the first averaging unit 10, an amplifier 11, the first and second information inputs 12 and 13. The meter operates as follows.

На первый вход поступает центриро-1 ванный эргодичёский случайный сигнал х (t), а на второй поступает сигнал f(t) « С-х (t-T,,), .где .The first input receives a centered-1 ergodic random signal x (t), and the second receives the signal f (t) С Cx (t-T ,,), where.

измеряемое время запаздывания (сдвига), С « const. В установившемся режиме сигналы на выходах фадьтров_вГ и 2 равщи соответственно £h(i) Y(tX)dX и J h(t) x(t-T)dT. Блоки 3-5 реализуют·, оператор текущего сглаживания 2-J^:x(t-'c)d'u сигнала x(t). Тогда на выходе блока 7 умножения присутствует сигнал x(t)J h(t) Y(tridt·, а на выходе блока 8°умножения присутствует сигнал ..measured time of delay (shift), C "const. In the steady state, the signals at the outputs of the faders _in Γ and 2 are equal to £ h (i) Y (tX) dX and J h (t) x (tT) dT. Blocks 3-5 implement ·, the current smoothing operator 2-J ^: x (t-'c) d'u of the signal x (t). Then, at the output of the multiplication unit 7, there is a signal x (t) J h (t) Y (tridt ·, and at the output of the multiplication unit 8 ° there is a signal ..

г, ⁴⁰ {Y(t) |h(T)x(t-T)'dt-y(t) ϊ]χ«r, ⁴⁰ {Y (t) | h (T) x (tT) 'dt-y (t) ϊ] χ «

Блок 10 усреднения определяет матема-^5 ? тическое ожидание поступающего на него сигнала, которое через усилитель 11 регулирует величину запаздывания блока 3 до тех пор (t*), пока значение сигнала на входе уси- 50 лителя не становится равным нулю.Block 10 averaging determines the math ^ 5? the expectation of a signal arriving at it, which through the amplifier 11 controls the delay value of block 3 until (t *), until the value of the signal at the input of the amplifier becomes equal to zero.

При выборе достаточно постоянной времени Т фильтров 1 и 2 нижних частот в сравнении с интервалом корреляции анализируемого сигнала справед- 55 ния выше, измеряется само значение увеличивается точность измерения при пологой форме Κ_γχ(ι).When a sufficiently constant time T is selected for low-pass filters 1 and 2 in comparison with the correlation interval of the analyzed reference signal 55 above, the value itself is measured, and the measurement accuracy increases with a gentle form Κ _γχ (ι).

Claims

The invention relates to specialized computational tools for measuring the temporal shift of two random signals, and can be used when detecting signals by the correlation method against the background of interference, in radio-frequency measurement, in diagnosing mechanical equipment, measuring motion parameters of an image. The purpose of the invention is to improve accuracy. The drawing shows a structural diagram of the proposed meter. The meter contains the second and first lowpass filters 1 and 2, respectively, the adjustable delay unit 3, the second subtraction unit 4, the second averaging unit 5, the third, the subtraction unit 6, the first and second multiplication blocks 7 and 8, the first subtraction unit 9, the first block 10 averaging, amplifier 11, first and second information inputs 12 and 13, the Meter operates as follows. At the first input is a centered ergodic random signal X (t), and the second receives a signal f (t) "Cx (tt), where x -, measured latency (shear), With "const. In the steady state, the signals at the outputs of filters 1 and 2, respectively (hCi) Y (t (:) dt and J h (7r)) dt. Blocks 3-5 implement., The current smoothing operator 2-Jx (t-L) di: signal x (t). Then at the output of multiplication unit 7 there is a signal x (t) j h (t) Y (tf) dir, a at the output of the multiplication unit 8 °. There is a signal {Y (t) -Jh (T) x (t-T:) - dt-y (t) 2 | x. 4f-l) dt} The averaging block 10 determines the mathematical: wait for the incoming signal to it, which through the amplifier 11 adjusts the delay value of the block 3 until (t) until the value of the signal at the amplifier input becomes zero. When choosing a sufficiently constant time T of filters 1 and 2 of the lower frequencies in comparison with the correlation interval of the analyzed signal at the right-hand side of the ratio h (lr)) K (T) dT; Jh (t) K (t) dTrKjK / r) d. oo From here, in steady state, by approving the feedback loop, we obtain the value of several measurements in a single K;: (D), in SIKIM values of K. (t) For this noise immunity measurement, the value f f itself is measured, the measurement accuracy increases with a flat form V. (i). Claims of the invention A correlation time shift meter comprising two multipliers, an adjustable delay block, a first subtraction unit, a first averaging unit and an amplifier, the outputs of the first and second multiplications blocks are connected respectively to the inverting and non-inverting inputs of the first subtracting unit, the output of which is connected through serially connected first the averaging unit and the amplifier are connected to the controlling ixopoMi of the adjustable delay unit, the information input of which is connected to the first input of the first unit intelligently This is the first information input of the meter, which is so that, in order to improve accuracy, two low-pass filters are introduced in it, the second and third subtraction blocks and the second averaging block, the output of the second subtraction block through the second averaging unit is connected to the inverting input of the third subtraction unit, the non-inverting input of which is connected to the first low-pass filter; cut the first low-pass filter to the same input of the second subtraction unit and, is the first information input of the meter, the second subtraction unit is connected to the first input, the second multiplication unit, the second input of which is connected to the input of the second low-pass filter and is the second information input of the meter, the output of the second low-pass filter is connected to the BTopbW input of the first multiplication unit.

W s

Lih

"