SU416697A1 - - Google Patents

Description

one

The invention relates to radio metering systems.

Devices for measuring the phase shift of signals are known, comprising a generator of calibration pulses connected via a first valve to a counting input of a first counter and an output of a first trigger.

However, these devices are characterized by a large measurement error associated with the presence of noise in the radio system.

The described device differs from the known ones in that it contains series-connected coincidence circuits, one of the inputs of which is connected to the outputs of the first counter, and an adder, the second valve, the inputs of which are connected respectively to the measured signal bus and the output of the first trigger, and the output to others the inputs of the joint schemes, the second counter, the input of which is connected to the output of the second valve, and the output - to the inputs of the installation “About the first trigger and the finally entered second trigger, the input of the installation“ 1 of which is connected bus start measurement, and the third valve, the inputs of which are respectively connected to the bus and a reference signal to the output of the second flip-flop, and an output coupled to the input for setting "1 of the first flip-flop.

This improves the accuracy of device B operation.

The drawing shows the scheme of the on-display device and the following notation is accepted: 1-generator, calibration pulses, 2 - the first valve, 3 - the first counter,

4 — nerve trigger, 5 — coincidence circuits, 6 — adder, 7 — second valve, 8 — second counter, 9 — second trigger, 10 — third valve, 11-bus of reference signals, 12 — bus of a single signal, and 13-bus beginnings

measurements.

In the initial state, valves 2, 7 and 10 are closed. Before starting the measurement, a number equal to

15

G d p (p) m 1 L2 for, J

where L is the capacity of the adder 6;

n is the number of measurements during the averaging time (equal to the capacity of the counter 8); f m - the frequency of the following calibration n 1X

generator 1 pulses; foil - the frequency of the following reference pulses on the bus 11.

Impulse "Measurement start is set

in "1 trigger 9. The first impulse on the bus 11

reference signals that fall in the 30 interval interval, does not exclude the state

the trigger 4, as a result of which the calibration pulses through the gate 2 receive iia the input of counter 3, and the gate 7 passes pulses of the measured signal on the spike 12 to the inputs of the matching circuit 5 and counter 8. The pulses of the measured signal through the coincidence; m ::; 5 is entered into the adder 6 numbers, ravpie by; a3h, h m m counter 3 to the time of their occurrence. The accumulation of the sum in the adder 6 occurs before the occurrence of a pulse of overflow of the counter 8, which sets Triggers 4 and 9. The removal of the measured phase shift of the signal is made from the higher (/ -t) digits of the adder,

where / is the adder bins; t - counter size 8.

The use of such a device improves the accuracy of measuring the phase shift of a signal in the presence of noise, greatly simplifies digital signal processing with a change in the minimum phase shift during the averaging interval and allows its variation over a wide range.

P 1) e dme e 1- invented and

ycTpoiicvBo for measuring the phase shift of signals, contains its calibrated pulse generator, connected via the 5th spiral to the counting input of the first counter and the output of the first trigger, characterized in that it contains successively connected coincidence circuits whose inputs are connected to the outputs of the first counter, and the adder, the second valve, whose inputs are connected respectively to the spike of the measured signal and the output of the first

the trigger, and the output to other inputs of the matching circuits, the second counter, whose input is connected to the output of the second valve, and the output to the inputs of the “About the first trigger and additional input of the second

the trigger, the setup input “1 of which is connected to the measurement start bus, and the third fan, whose inputs are connected respectively to the spike of the reference signals and to the output of the second trigger, and connected to the input

installation "1 first trigger.

5 i

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