SU266870A1 - PANORAMIC METER PARAMETER OF MICROWAVE TRACTS - Google Patents

Description

The invention relates to a radio measuring technique and can be used in panoramic measuring parameters of the microwave paths.

Existing panoramic meters of the parameters of the microwave paths (KSV impedance meters, etc.), as a rule, are constructed according to the principle of distinguishing incident and reflecting waves using directional taps. In such meters, a significant proportion of the total measurement error is systematic error, due to the non-identity of the amplitude-frequency characteristics of the microwave elements of the channel of the reflected and incident waves (taps, detector or mixing heads). The manufacture of elements with identical parameters in the frequency range is limited by the technological difficulties of production and the spread of the parameters of the microwave detectors.

Known compensation schemes for systematic faults are performed by performing a discrete correction by adjusting the gain in the indicator unit using a stepwise voltage that approximates the pattern of systematic faults. This stepwise voltage of a complex shape is formed by a software device that is triggered by a sync pulse at the moment when the sweep generator frequency tuning begins. The correction device compensates for a given program in the set frequency band of the sweep generator.

However, in panoramic meters with such

corrective systems when changing the initial frequency of the sweep generator, it is necessary to change the program of the correction device, since the magnitude of the systematic error is uniquely related to the frequency

sweep generator.

The proposed panoramic meter differs from the known ones in that in the software device the outputs of the clock generator and

microwave generator modulator; the input of the blocking generator is connected to the output of phantasgron and the output of the clock pulse generator; the output of the blocking generator is connected to a dekatron whose cathodes are connected to a common load connected to the input of the indicator amplifier.

This allows to increase the accuracy of the image characteristics on the electron beam tubes (CRT), to reduce the measurement error and eliminate the need to select elements of the microwave path with identical frequency characteristics in the channels of the reflected and incident waves.

The signal from the SVP generator D pass through the directional couplers 2 and 3, but the signal to the object under study 4. The coupler 2 outputs. the signal is proportional to the incident wave, and the coupler 3 is proportional to the reflected wave. The amplifier 5 maintains the voltage at the output of the detector 6 at a constant amplitude, and the voltage from the detector 7 is amplified by the amplifier 8 and is recorded on the screen of the CRT 9.

The systematic error of measurement can be detected on the screen of a CRT 9 in the calibration process in the form of unevenness of the calibration level, when the taps 2 are focused on the incident wave and the path is loaded on a matched load.

To compensate for systematic errors, the coefficient of amplified amplifier 8 is adjusted. Moreover, the change in the magnitude of the control voltage in the frequency band of the sweep generator should occur according to the same law that the change in the systematic errors is only with the opposite sign.

To do this, a programming device is introduced into the panoramic meter circuit consisting of a clock generator U, fadron I, a block generator 12 and a decatron 13.

The output of the regulating (correcting) voltage to the amplifier 8 of a certain size in certain parts of the frequency range is as follows.

A clock iO generator, synchronized by pulses from the sweep generator, corresponding to the beginning of the frequency tuning, triggers the fadron 11 circuit, which produces rectangular pulses.

The duration of the pulses produced by the phdron, depends on the magnitude of the voltage adjustment of the generator lamp, which is also fed to the fadron. Since a certain value of the tuning voltage corresponds to a certain value of the frequency of the sweep generator /, the fadron pulse duration // will be proportional to the generator frequency.

Fadron impulse // turns on the blocking generator 12, which, depending on

The duration of the incoming pulse produces a burst of 1 to 10 pulses. These pulses are sent to a decatron, in the cathodes of which potentiometers are included, allowing you to set the required values of the components of the voltage, which, after summation, form a stepwise voltage. This voltage is used to control the gain of the amplifier 8.

Each pulse of the clock generator resets the decatron 13. With a constant adjustment voltage at the input of the fadron 11, i.e. at a constant frequency of the sweeper, I, in the interval between the clock

the pulses will turn on a certain cathode of the decatron, corresponding in number to the number of pulses arriving from the blocking generator. When the voltage at the input of fadron / V changes, i.e., when the frequency of the sweep generator 1 changes, the fadron pulse will change, the number of pulses emitted by the blocking generator in the interval between clock pulses will change, and the number will change accordingly. included cathode decatron. Thus, during the period of restructuring of the saig generator, a step voltage will be generated at the output of the correction circuit, the amplitude of the steps of which the molset operator

set with potentiometers in the cathodes of the decatron, changing it from 0 to the required value.

Subject invention

A panoramic meter of microwave parameters, consisting of a sweep generator, microwave nodes, an indicator and a software device, characterized in that, in order to increase

measurement accuracy; in the software device, the outputs of a clock pulse generator and a microwave generator modulator are connected to the inputs of the fadron; the input of the blocking generator is connected to the output of the fadron and the output of the clock pulse generator; the output of the blocking generator is connected to a dekatron whose cathodes are connected to a common load connected to the input of the indicator amplifier.