SU1541530A1 - Device for forming the sampling rate of digital phase meter - Google Patents

Abstract

The invention relates to a radio metering technique and can be used to construct digital phase meters with optimal quantization. The purpose of the invention is to expand the frequency range. The device contains a signal frequency measurement unit 1 with a computing unit 2 connected to it, with which the measured frequency value of the signal calculates codes for controlling two frequency dividers 3.4 with a variable division factor, which are combined with serially connected phase detector 5, filter The 6 low frequencies 6 and the tunable oscillator 7 form a ring of the digital PLL. In this case, the control inputs of frequency dividers 3.4 are connected to the output of the computing unit 2, the outputs to the corresponding inputs of the phase detector 5, and the counting inputs to the output of a tunable generator 7 and the input of the frequency measurement unit 1, which is the input of the device. By appropriately choosing the division factors of 3,4 frequencies, it is possible for any signal frequency to provide the optimum ratio of signal frequencies and quantization with minimum oscillator tuning limits 7. 1 sludge.

Description

a device for generating a frequency JQ quantization and a measurement time of a quantization digit of a digital phase meter.

The device contains a frequency measurement unit 1, a computing unit 2, first 3 and second 4 frequency dividers with a variable division factor, J5 phase detector 5, low pass filter 6 and tunable oscillator 7,

The count input of the first divider 3 and the output of block 1 are connected to the input of the device. The output of block 1 is connected 20 to the input of block 2, the first output of which is connected to the control inputs of the first 3 and second 4 dividers. The output of the first divider 3 is connected to the first input of the detector 5. The detector 25 output 5 through a sequentially connected filter 6 is connected to the generator input 7, the output of the latter to the counting input of the divider 4, the output of which is connected to the second input of the detector, Q 5, The output of the generator 7 is the first, the output of the first divider 3 is the second, and the second output of the unit 2 is the third output of the device.

The device works as follows.

The input signal with the frequency Fc from the output of the forming device of the digital phase meter is fed to the inputs of the perr phase meter, at which the phase measurement result is directly obtained in degrees

e

f

t

, K, 3.6

ten

where Ko2, 1 are integers, In this case, the division factor K? 2 is constant, and only the division factor Kd1 changes.

The current frequency value of the signal from frequency measurement block 1 is compared in block 2 with the value for which the division factors of the first 3 and second 4 dividers are calculated. The correction of the division factors is made only when the change in the frequency of the signal exceeds a certain threshold value, which corresponds to the maximum permissible deviation of the frequency of the generator 7

4fnr.Aon FcnoP

35

KJ2 / KJ1

In accordance with the indicated expression, block 2 calculates the coefficients and K yi

Thus, the device provides the expansion of the frequency range to form the quantization frequency of digital phase meters with optimal3 and block 1, measured by quantization, the frequency of the signal by the block, and the necessary dividers K, 1, and second 4 are set. and the process of installing the AFC at the output of the oscillator with a frequency

45

Claims (1)

Formula of A device for quantizing a digit containing the subsequent phase frequency detection and rearranging the output of which is the device, o with the fact that, from the center of the range, the measuring unit is a variable number unit, while the division of the frequency divider frequency measurement fnr-ni K, Kgt / Ky TO, With non-multiple values. П ,, this frequency satisfies the condition of optimal digital phase meter on the measurement time interval tM3w Ka, / Fc corresponding to the frequency of the signal at the output of the first 3 or second 4 dividers (at the inputs of the detector 5) F0 l / t “, w FC / K g, V / K, a. In addition to the condition of non-multiplicity, the division factors K, K j j7 are selected from a phase meter at which the phase measurement result is directly obtained in degrees e f t , K, 3.6 ten where Ko2, 1 are integers, In this case, the division factor K? 2 is constant, and only the division factor Kd1 changes. The current frequency value of the signal from frequency measurement block 1 is compared in block 2 with the value for which the division factors of the first 3 and second 4 dividers are calculated. The correction of the division factors is made only when the change in the frequency of the signal exceeds a certain threshold value, which corresponds to the maximum permissible deviation of the frequency of the generator 7 4fnr.Aon FcnoP KJ2 / KJ1 In accordance with the indicated expression, block 2 calculates the coefficients and K yi Thus, the device provides an extension of the frequency range to form a quantization frequency of digital phase meters with optimal quantization, Invention Formula A device for generating a quantization frequency of a digital phase meter, containing a series-connected phase detector, a low-pass filter and a tunable oscillator, the output of which is the first output of the device, characterized in that, in order to expand the frequency range, a numeral unit and two frequency dividers with a variable division factor; the counting input of the first frequency divider with a variable division factor is combined with the input of the device and the input of the frequency measurement unit, the output is 5 15415306 Rogo is connected to the input of a computational key to the counting input of the second branch - unit, the first output of which is a variable frequency frequency coupler, with the control inputs of the two dividing units, the output of the first divider ( variable frequency factor with variable decimal factor, the outputs of which the baseline is the second, and the second output They are connected to the inputs of the phase detector, the computing unit - the third output of the tunable generator by the device.