SU1597788A1 - Apparatus for measuring amplitude-phase distribution of aerial - Google Patents

Abstract

The invention relates to antenna measurements. The purpose of the invention is to improve accuracy. The device for measuring the phase distribution of the antenna operates as follows. The signal from the microwave generator 1 is fed to the measured antenna 2, is radiated and received by the probe 3, moved by the coordinate measuring unit 4. For the measurements, an amplifier 6 is used, connected to the control and processing unit 5, which controls the unit 4 3. The first measuring line 7 with the first linear coordinate measuring unit 9, loaded on the short connector 8, is connected to the measuring channel of the amplifier 6 between it and the probe 3, the second measuring line 10 is connected between the generator 1 and am lifazometrom 6 and performs the function of a stable controlled phase shifter. The wave arising in the first 7 measuring line provides the distribution of the cosine between the minimum and maximum at a distance of a quarter of the wavelength. This makes it possible to create a controlled attenuator based on elements 7, 8 and 9. 1 il.

Description

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The invention relates to antenna measurements and can be used in tests of microwave antennas.

The purpose of the invention is to improve accuracy.

The drawing shows an electrical structural diagram of a device for measuring amplitude-phase distribution (AFS).

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The device for measuring an AFR antenna includes a microwave generator 1, the output of which is connected to the input of the measured antenna 2, the probe 3 is moved in the aperture of the measured antenna 2 by means of the coordinate-measuring unit 4, the input of which is connected to the output of the control and processing unit 5, to the input of which the output of the amplification meter 6, the first input of which is connected to the output of the movable probe of the first measuring line 7, loaded on the short circuiter 8, the input of which is connected to the output of the probes 3. The movable probe of the first measuring line mechanically connected to the first linear coordinate measuring unit 9, the input of which is connected to the second output of the control and processing unit 5. The second input of the amphibometer 6 is connected to the output of the movable probe of the second measuring line 10 loaded on a matched load 11, the input of which is connected to the output of the microwave generator I. The movable probe of the second measuring line 10 is mechanically connected to the second linear coordinate measuring unit 12, the input of which connected to the third output of the control and processing unit 5.

A device for measuring an AFR antenna operates as follows.

The signal from the microwave generator 1 is fed to the measured antenna 2, is emitted and received by the probe 3, moved by the coordinate measuring unit H. The measurements are made using an amplifier 6 that transmits the measurement results to the control and processing unit 5, which controls the unit 4 probe 3.

The second measuring line 10, loaded on the matched load l 1, switched on between the generator 1 and the amplifier 6, while moving along the line of the movable probe using the second linear coordinate measuring unit 12, controlled from the control and processing unit 5, performs the role of stable control phase shifter. Moving the moving probe of the second measuring line 10 in proportion to the speed of wave propagation in the line changes the phase of the signal. It is possible to create a stable phase shifter on the basis of measuring line with a consistent load. The first measuring line 7 with the first linear coordinate is included in the measuring channel of amphpazometer 6 between it and the probe 3.

measuring unit 9, loaded on the short connector 8.

The wave arising in the first measuring line 7 of one hundred meters ensures the cosine distribution of the field between the maximum and minimum at a distance of a quarter of the wavelength. This makes it possible to create on the basis of these elements 7–9 a controlled attenuator which, at the command of control and processing unit 5, ensures the amplitude change according to the test law.

In the course of measurements, in order to determine systematic errors, the measured amplitude-phase-phase distribution is simulated by a test, for which the reconstructed MDs are known. The simulation is carried out on a real stand equipment using controlled elements 7-12, which provide a change in amplitude and phase set by block b with the fixed position of the probe 3 at rest. The measuring device measures these changes taking into account its real error, including the faults of the amplification meter 6 subject to the agreement of his wasps; with control and processing unit 5, as well as faults due to frequency instability and signal level of oscillator 1, antenna instability 2, etc. The first error analysis occurs after comparing the specified test distribution and the measurement result of this distribution. The detected systematic errors in the phase measured PRA distribution characterize the device faults in the measurement of PRA. According to the results of the performed PRA simulation, the DN is restored on real equipment on the basis of a real processing program, taking into account the error in it. A comparison of the error results with the DN that should have been obtained (theoretically known), if there were no leakages, it is possible to find the device faults in the DN parameters, and in any that are of interest, for example, the side lobes, the width of the DN, the faultness restorations at various 45 levels and others. It should be noted that errors can be found not only for DN, but also for PRA by comparing the simulated PRA with the results of the simulation on real equipment, as suggested. Systematic errors resulting from the non-linearity of the elements of the device can be entered into nporpaMMj / to correct the measurement results, which increases the accuracy of the measurements.

Claims (1)

Claim 55. A device for measuring the amplitude-phase distribution of the ante., Including a probe mounted with movement in the aperture of the antenna by means of a coordinate-measuring unit, the input of which is connected to the first output of the control and processing unit, the input of which is connected to the output of the ampli-phase meter, a microwave generator, the output of which is connected to the input of the measured antenna, in order to increase precision, introduced the first and second linear coordinate measuring units, the first and  ",, ™, lgt1 rtiro TT1JUUUPOPIIZH Measuring blocks, respectively, the input of each of which is connected respectively to the second and third outputs of the control and processing unit, the input of the sub-mobile probes of the first and second measuring lines are connected to the first and second inputs of the amplification meter, respectively, the input of the first measuring line is connected to the output of the probe, and the exit is loaded onto the shortcut, the input of the second ... pyyi pppklyuchen to the exit BOCAcnui i.v-f. „... j .-. RnviKPH on KOROTKOZYMYKag-Yu, Yezlid u. Diatom measuring units, the first 1 line is connected to the output second measuring lines, mobile. probes of which are mechanically connected to a ln-microwave generator, and you. DK. vym and second linear coordinate-due load. measuring blocks, respectively, the input of each of which is connected respectively to the second and third outputs of the control and processing unit, the input of the movable probes of the first and second measuring lines is connected to the first and second inputs of the amplification meter, respectively, the input of the first measuring line is connected to the output of the probe, and the output is loaded onto the short circuit, the input of the second ... pyyyi pppklyuchen to the output rnviKPH on KOROTKOZYMYKag-Yu, Yezlid u.    The first line is connected to the output. .