SU966621A1 - Device for determining phase fluctuation standard deviation - Google Patents

Description

C54) DEVICE FOR DETERMINING THE MEDIUM-SQUADRATIVE DEFLECTION OF FLUCTUATION PHASE

The invention (related to measurement technology and can be used in phase radio engineering.

A device for determining the root-mean-square deviation of phase fluctuation is known, containing 1 its limiting amplifier, frequency divider, frequency multiplier, anti-coincidence circuit, averaging device and indicator l.

The disadvantage of this device is the insensitivity of measurements to the components of the spectrum, which leads to an error in determining the root-mean-square deviation of phase fluctuation (FF) for an arbitrary nature of the phase fluctuation spectrum.

The closest to the proposed technical entity is a device for determining the standard deviation of fluctuation, containing a series-connected amplifier-limiter, a time interval generator, an anti-coincidence circuit, a summing device, and an indicator, with the second input of the anti-coincidence system connected to the output of the boundary limiter | 2 J.

However, this device is characterized by measuring insensitivity.

to spectral components that are multiples of the election frequency. In this case, the largest errors in the measurement of the MSE are obtained in the case when the most pronounced components of the FF spectrum turn out to be equal to one of the harmonics of the sample frequency.

The purpose of the invention is to improve the accuracy of measurement of the rms

10 phase fluctuation deviation.

This goal is achieved by the fact that a series of anti-coincidence unit, the second input of which is connected to the input of the first time interval generator, the secondary device and the indicator, are connected in series to the device for determining the standard deviation of the phase fluctuation, the second input of which is connected to the input of the first time interval generator, the secondary device and the indicator. and the second time interval former and the anti-coincidence unit, the second input of the second

The anti-coincidence unit 25 is connected to the input of the second time interval generator, and the output is connected to the second input of the averaging device, the device input being the input

Claims (2)

30 of the comparator, the inverse output of which is connected to the input of the first time interval generator. Shapers time intervals made in the form of storage units. The drawing shows a diagram of the proposed device. icTpoflcTBo to determine the mean square deviation of phase fluctuations contains a comparator 1, a format 2 and 3 time intervals, anti-coincidence blocks 4 and 5, averaging (Descriptive device 6 and indicator 7 and sequentially connected to parator 1, whose input is the input of the device, Shaper 2 time intervals, anti-coincidence unit 4, averaging device 6 and indicator 7, the second input of anti-coincidence unit 4 is connected to the input of the time interval generator, and the inverse output of comparator 1 is connected to but the anti-coincidence unit 5, the second input of which is connected to the input of the generator of 3 time intervals, and the output - with the second input of the averaging device. The device works as follows: The signal under test arrives at one of the inputs of the comparator 1, the standard deviation of the fluctuation of the phase of which is required to be determined. A second voltage is supplied to the second input of the comparator, which determines the threshold of the comparator and, therefore, the level of analysis ation phase. The magnitude of the output voltage of the comparator 1 assumes a state of logical 0. or i, depending on the ratio of the test and reference signals. The output voltage of the comparator changes its value at the moments of equality of the studied and reference signals. The moment of time change of state of Comparator 1 carries information about the magnitude of phase fluctuation. The signal from the direct output of the comparator 1 is fed to the inputs of the anti-coincidence unit 4 directly and through the shaper of 2 time intervals. At the output of the imaging unit 2 time intervals, an impulse is formed with a polarity opposite to the input impulse and a duration equal to the input impulse duration (impulse in the absence of phase fluctuations, since both of these impulses enter the anti-coincidence unit 4 simultaneously and in antiphase, then at the output of the unit 4 anti-coincidences will form a pulse, the duration of which is equal to the difference of the durations received at its pulse inputs. The signal from the inverse output of the comparator 1 is fed to the inputs of the anti-coincidence block 5 only through the shaper of 3 time intervals. At the output of the shaper of 3 time intervals, a pulse is formed with a polarity opposite to the input pulse and a duration equal to the duration of the input pulse in the absence of phase fluctuations, since both of these pulses go to the antisubjugation unit 5 simultaneously and in antiphase A pulse will then be generated at the output of the anti-coincidence unit 5, the duration of which is equal to the difference in the durations of the impulses arriving at its inputs. In this case, the conversion is carried out by the shaper of 2 time intervals and a block. 4 anti-coincidences will be insensitive to one hour. The current components of the spectrum of phase fluctuations multiple to the frequency f. However, the phase fluctuations are transformed — the time interval carried out by the shaper of 3 time intervals and the anti-coincidence block 5 will be insensitive to the frequency components of the spectrum of the phase fluctuations. f 1. ATjj By changing the level of the reference voltage, it is possible to change the magnitude of the spectrum components (1) and (2) to which the device is insensitive, with more complete use of information about the spectral composition ie phase fluctuations. The impulse sequences from the anti-matching blocks 4 and 5 are fed to the averaging device 6, which averages the measurement result. The estimation of the standard deviation of the phase fluctuations from the output of the averaging device b goes to the indicator 7, For easier operation with the device, it is convenient to perform the formers 2 and 3 time intervals in the form of a storage device. In this case, a pulse is formed at the output of the memory device, the duration of which is equal to the duration of the previous pulse. As a result, pulses are formed at the output of blocks 4 and 5 of anti-matches, the durations of which are equal to the differences of the durations of the previous and subsequent pulses coming from the output of the comparator 1. With ems there is no need to preset the duration of the pulses at the output of the formers 2 and 3 time intervals input to the comparator 1. Thus, an introduction to the known device for determining the standard deviation of the fluctuation of the comparator phase and itelnyh shaper slots and block anticoincidence povaiaet accuracy due to more complete information about the use of the spectral composition of phase fluctuations. The most significant increase is in the accuracy in the case of determining phase fluctuations with pronounced discrete components of the spectrum. Claim 1. Device for determining the root-mean-square deviation of phase fluctuations, containing successively connected first time interval generator, first block anti-fall, the SECOND input of which is connected to the input of the first time interval former, averaging device and indicator, characterized by the fact that in order to improve the measurement accuracy, a successively connected comparator and a second time interval generator and an anti-coincidence unit are entered into it, the second input being second The anti-coincidence unit is connected to the input of the second time interval generator, and the output is connected to the second input of the averaging device, the device input being the comparator input, the inverse output of which is connected to the input of the first time interval 2 generator. In particular, in order to simplify the work with the device, the time interval formers are made in the form of memory blocks. Sources of information taken into account in the examination 1. USSR author's certificate 704902, cl. G 01 R 25/00, 1979.: 2. USSR author's certificate 601631, cl. G 01 R 25/00, 1978.