SU533879A1 - Phasometric device - Google Patents

Description

The situation is connected to the controllable delay node and the variable correction effect device, the output of the third sign circuit is connected to the reversible counter, and the output of the amplifier-limiter directly to the inputs of the three sign circuits and through the phase detector to the input of the reversible counter, while the analyzer inputs are sign situations are connected to the outputs of the three sign schemes.

By selecting the value of the step of shifting the reference scale based on analyzing information about the sign situation of the reference scale and auxiliary gates and filtering the phase mismatch, the reference scale is combined with the signal in phase for fewer control actions on the reference scale and, consequently, in less time.

In addition, an additional effect is provided, consisting in the approximate constancy of the measurement time of any error, since the initial shear level is adapted to the value of the misalignment of the reference voltage and signal and the initial control of the reference scale ensures its alignment with the signal within the specified value.

The drawing shows a structural electrical circuit of the proposed device.

The output of limiting amplifier 1 is connected to the inputs of phase detector 2 and three circuits of 3, 4, 5 characters. The output of the detector 2 is connected to the input of the reversible counter 6, the outputs of which are connected through the device 7 of the variable correction effect with the discrete phase shifter 8, the input of the latter is connected to the reference generator 9, and the output to the frequency divider 10.

The phasometric device also contains the auxiliary gate driver 11, the controlled delay node 12, the analyzer 13 of the sign situation and the readout device 14.

Phasometric device operates as follows.

The input signals mixed with noise are converted by using the amplifier-limiter 1 into rectangular pulses, which are fed to the circuits 3, 4, 5 and phase detector 2. The divider 10 forms the reference scale pulses from the frequency of the reference oscillator 9 by means of the former 11. gates lagging and leading pulses of the main scale for a selected interval ti. In this case, the initial stage of the shift of the phase shifter 8, determined by the device 7 of the non-time correction effect, is also equal to t. The auxiliary gates through the node 12 arrive at two circuits 3, 4, the main scale pulses arrive at the third circuit 5 and the detector 2. With the help of circuits 3, 4, 5 it is determined with which half-wave signal, positive or negative, the auxiliary

gates and small scale. At the same time, the sign shells can have a φ filter, they have properties, for example, use counters to accumulate the result.

If the pulses of the main scale coincide with the positive half-wave, and the auxiliary gates lagging behind ti - with the negative half-wave (or the main scale coincides with the negative half-wave, and the gates leading with ti — positive), then using the analyzer 13 a signal is generated that reduces the level the shift specified by the device 7, by a specified amount. In addition, this signal also controls

node 12 and reduces by an appropriate amount the error interval of the auxiliary gates relative to the pulses of the main scale (up to r2).

If the sign of the situation has not changed, then

the generated signal of the analyzer 13 again reduces the level of shift of the reference scale and the interval between the auxiliary gates and pulses of the reference scale. The decrease in the degree of shift and the interval occurs to

as long as the lagging strobe does not coincide with a positive half-wave signal.

In this case, the degree of shift of the reference scale through a discrete phase shifter is approximately equal to the degree of mismatch between the scale and the signal. The phase detector 2 and the reversible counter 6, which has a significantly longer time constant than the sign circuit and provides filtering of the phase mismatch, generates a test signal, which through the device 7 and the discrete phase shifter 8 shifts the reference scale to the signal front. The magnitude of the shift is set by the device 7 and depends on the magnitude of the error in accordance with the described

above, and the shift direction is defined by the third circuit 5, the output of which is connected to the input of the counter 6, which determines the counting direction. Thus, after the first control of the reference scale, the error of the latter with the signal is not large. Then, the sign situation is analyzed again and the interval and the degree of shift of the reference scale are controlled until the minimum interval is reached.

between the auxiliary gates and the pulses of the main scale, which is determined on the basis of the required accuracy. In this case, filtering the phase error signal controlling the reference scale through the reversible counter 6 provides the necessary accuracy. The amount by which the shear rate is reduced may be constant, but may vary, for example, linearly.

The device corresponding to the prototype does not have a flexible change in the magnitude of the shear stage and processes the misalignment sequentially, stage by stage. Thus, the use of results

analyzing the input signal and noise mixture for

changes in the structure of the meter and optimization of the measurement process have the features of an adaptive procedure and determines the advantages of the proposed device. The calculated data show that the time gain for a given measurement accuracy, as compared with the device corresponding to the prototype and used in practice, is 2-3 times. This allows, for example, a significant reduction in the time taken to obtain a radionavigation parameter or a correction for a time scale.

Claims (2)

1.Avt. St. USSR № 469933, cl. G01R 25/00, 04.29.72. 2. Avt. St. USSR № 403096, cl. H 041 7/10, 09/27/71.