SU1298681A1 - Phase-meter - Google Patents

Abstract

The invention can be used in measuring the phase shift of single short radio pulses, as well as continuous signals with a short time to access them. The purpose of the invention is to increase the speed of the device. The phase meter contains a phase meter 3, a gate pulse shaper 4, a generator 9, and identical channels 1 and 2. Each channel 1 and 2 includes two-position switches II and 12, t-elements I3 and 14 with charge coupling, and a low-frequency filter 16 . Due to the introduction into each channel 1 and 2 of the adder 15, a one-time measurement of the phase shift is sufficient while maintaining the accuracy characteristics. The reliability of the device is enhanced by the insertion of the key 10 and the use of devices 13 and 14 with charge coupling. 2 Il. with "Figure 1

Description

The invention relates to phase metering and can be used in measuring the phase shift of single short radio pulses, as well as continuous signals with a short time to access them.

The purpose of the invention is to increase the speed of the device.

Figure 1 shows a diagram of the phase meter; , FIG. 2 shows signal diagrams for the case when m 8,

The phase meter contains identical ka-Hajibi 1 and 2, to the outputs of which phase meter 3 is connected, a gate driver 4 connected to the input of channel 2 and having main 5.6 and additional 7.8 outputs, the latter connected to the control inputs of the generator 9 and additionally entered key 10.

The generator 10. is made of two-frequency and has two outputs. At the output, connected to the driver 4, the pulse frequency is F m F, where n and F are the number of sampling points and the frequency of the filling oscillation of the input pulse of the phase meter, respectively. At the other exit -

manipulated by 7, if present and when it is absent

The phasometer channel contains a series-connected two-position keys P and 12, t-element devices 13 and 14 with a charge coupling (CCD), an adder 15, a low-frequency filter 16 (LPF). A CCD is a device for sampling and shifting analog information, performed under the action of clock pulses. Using key 1 (12), the input of the CCD 13 (14) is switched to either the channel input or the CCD output. In the first case, the recording of the input radio pulse is organized in the CCD, in the second - its matching. The transmission coefficients of both CCDs are set to one. In the absence of recording pulses from outputs 5 and 6, the keys are in a position where the input and output of each CCD are connected. The clock inputs of the CCD 13 and 14 are connected to the outputs of the key 10 and the generator 9, respectively (figure 2, signals 17,18). The outputs of the CCD 13 and 14 are connected via an adder 15 and a low-pass filter 16 with

channel output. The 4-strobe pulse shaper performs the function of the control unit.

The device works as follows.

The signals under study, for example, harmonic filling RI, are connected to the inputs of channels 1 and 2.

In each channel of the phase meter during the action of the pulses from the outputs 5 and 6, the RIs are fed to the inputs of the CCD 13 and 14. At the same time, each CCD is supplied with m clock pulses for the CCD 13 operating at times t, t, ..., tg, and for CCD-14 - at times t, jt,. . . ,, t, o (figure 2, signals 17,18). Let the phase of the filling oscillation of the RI at the moment t be equal to (.р., Then the specified time points correspond to the RI samples recorded in the CCD 13 and 14, starting respectively with the phase LP, and 9, + || / 2. By blocking the CCD pulses 13 (the opening of the key 10 under the action of the pulse from the output 8, the phase tfj of the oscillation stored in it is preserved to the beginning of the reading interval (time t, |, Fig. 2).

The frequency of the clock pulses in the scan cycle (t t ,,) is chosen to be FQ 1 / t, where Zr is the time constant for memorizing the CCD cells. If the frequency F, (i.e., F, / t) satisfies the same ratio, then the read signals at the CCD 14 are step copies of the signals

2 lr

U ,, (t) .t -cf,);

m

U, (t) sin - (,).

At frequencies F, commensurate with l / o, the initial phases acquire parasitic increments А „and L, due to the decrease in the values of the signal samples by the moment of the beginning of the transmission due to the discharge of the memory capacitors in the CCD. The sign and value of the error depends on the initial phase of the memorized signal, and for phases differing in / 2 they are close in value and opposite in sign, i.e. nd (, -U12 With this in mind, the initial phases and, (t) and and, (t) will be

(L, tp, + L „; V, 2 Cf, + f / 2 -d ,,

12

where c ;, and c, is the acting phase

shift,

The output signals of the CCD 13 and 14 are summed in the adder 15, and then filtered in the low-pass filter 16, the phase of the total signal at the channel output is equal to

 (+ Cf „) / 2 IT / 4 + H, +

In channel 2, a similar transformation of the second RI is performed, i.e. 1.25 m samples are stored during the access time. By reading two groups of samples, two step copies of the input ROI are formed and then summarized. Using the low-pass filter 16, the main harmonic of the sum signal is extracted, the phase of which is equal to

th ,, - b

2

and - +, 0 + Aztl ii L If2 - / 4 + H a +

Phase meter 3 measures the phase shift of the output signals of channels 1 and 2, i.e.

V, (p.) Kg (

Since / b „/ / d, r |, a / d, / / b ,, J then 9, -V is equal to the desired phase shift cf, - t | filling oscillations RI, where D 2, and UL 52 - phase increments, parasitic increments of the main harmonic phase of the signal.

Thus, the increase in speed is achieved by introducing an adder, which leads to the sufficiency of one dimension of the phase shift (against two characteristic of the known device) while maintaining the accuracy of the device at the level of the known. Achieving device reliability is achieved by introducing everything

five

.

W

0

five

0

50

two keys and two CCDs instead of blocks of 1.25 m high-speed keys and 1.25 ha of storage devices. Invention Formula

A phase meter containing a strobe pulse shaper, a pulse generator, a phase meter and two identical channels connected between the device inputs and phase meter inputs, each of which has a low-pass filter at the output, and serially connected key blocks and memory elements at the input, with signal and control The key block inputs are connected respectively to the channel input and the gate gate driver outputs, characterized in that, in order to improve speed, a key is entered into it and in each channel a sum p, the output of which is connected to the input of the low-frequency filter, the memory elements are executed in the form of two t-element devices with charge coupling, and the key block is in the form of two-position keys, each of which has an additional signal input connected to the output of the device with charge coupling, the outputs of which are connected to the inputs of the adder, and their clock inputs are directly and the second through the key entered are connected to

the pulse generator, the strobe pulse shaper is provided with two additional outputs, one of which is connected to the pulse generator, the other with the control input of the key, the output of the pulse generator is connected to the input of the strobe pulse shaper, the second input of which is connected to one of the device inputs.

Claims (1)

Claim A phasometer containing a strobe driver, a pulse generator, a phase meter and two identical channels connected between the device inputs and the phase meter inputs, each of which has a low-pass filter at the output, and key blocks and memory elements connected in series, the signal and control inputs a block of keys are connected respectively to the channel input and the outputs of the strobe pulse former, characterized in that, in order to improve performance, a key is entered into it and an adder in each channel, the output of which is connected to the input of a low-pass filter, the memory elements are made in the form of two w-element devices with charge coupling, and the key block is in the form of on-off keys, each of which has an additional signal input connected to the output of the charge-connected device, outputs which are connected to the inputs of the adder, and their clock · inputs are one directly, and the second through the entered key is connected to the pulse generator, the strobe generator is equipped with two additional outputs, one of which is connected to a pulse generator, the other with a control input of the key, the output of the pulse generator is connected to the input of the strobe pulse generator, the second input of which is connected to one of the inputs of the device. I 29868ι