SU464858A1 - Digital phase meter - Google Patents

Description

one

The invention relates to radio digital phase measurements and can be used in radio systems using a phase method for measuring motion parameters.

In the known high-frequency phase digital meters, the low-frequency spectral components of internal noise, supply voltage instabilities, parameter instabilities, etc., that have a correlation time longer than a high frequency period, are poorly averaged or not smoothed at all. interval between the corresponding zero transitions of the reference and measurable processes.

This leads to additional measurement errors.

The purpose of the invention is to reduce the error of phase digital measurements.

For this, the proposed device is equipped with an electronic switch and a frequency divider of the counting pulses, the outputs of the reference oscillator, the generator of counting pulses and the output with a negative pulse of the received signal generator are connected to the inputs of the key circuit, the output of the key circuit is connected via an electronic switch to the input of the frequency divider and to the pulse counter, the output with a positive pulse from the driver of the received signal is connected to the control input of the electron about switch and output divider

the frequency of the counting pulses - to the input of the pulse counter.

The drawing shows a block diagram of the proposed meter. The meter contains a generator 1 counting

pulses, shaper 2 of the received signal with two outputs, key circuit 3, shaper 4 of the reference oscillation, electronic switch 5, divider 6 of the counting pulse frequency and counter 7.

The device works as follows. The positive reference pulse opens the key circuit 3, with the result that the electronic switch 5 sends counting pulses from generator 1 to counter 7, since

there is still no control pulse from the driver of the received signal at its input. The received harmonic signal is filtered by a narrowband receiver and fed to shaper 2, where, after limiting and differentiating to the limit, positive and negative pulses are formed, corresponding to the transition points of the received zero-crossing. Positive impulse affects

An electronic switch 5 which connects the output of the key circuit 3 to the input of the divider 6, the output of which is connected to the input of the pulse counter 7. The arrival of the counting pulses to the counter stops at that moment when the negative pulse from the driver 2 turns on the circuit 3.

Since the counting of pulses in the time interval between the positive and negative pulses of the signal under study is performed with a frequency that is half as much, the number of pulses counted by the counter in this interval corresponds to half of it. Therefore, the counter will be recorded number corresponding to the sum of the evaluation phase and -. If in counter 7 before the count the number is set in the additional binary code, then at the end

counts, at the time of the formation of a negative pulse of the received signal, the number in the counter will be equal to the value of the estimated phase.

The next cycle of phase measurements may not be earlier than after one period of the signal frequency.

Subject invention

A digital phase meter containing shapers of the reference and received signals, a counting pulse generator, a key circuit and a pulse counter, characterized in that, in order to reduce phase digital measurement errors, it is equipped with an electronic switch, frequency divider, and the shaper outputs are connected to the key circuit inputs

reference oscillator, counting pulse generator and one of the outputs of the receiving signal generator, the output of the key circuit is connected via an electronic switch to the input of the pulse frequency divider and to the input of the pulse counter, the second output of the receiving signal generator is connected to the control input of the electronic switch, and the output of the frequency divider to the input of the pulse counter.

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