SU1453333A1 - Device for measuring signal power - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used in the development of means for measuring the power of microwave signals. The purpose of the invention is to expand the frequency range and speed while simplifying the device is achieved by introducing into the device a generator of broadband noise with a stable spectral plane. The device contains a source of 1 measured signal. reference generator 2 wideband noise, adder 3, meter 4 modulation index. From the source 1 of the measured signal, the signal is fed to the input of the adder 3, to the second input of which a broadband noise signal is received. At the output of the adder 3, a signal is generated modulated in phase and amplitude so that the square of the modulation index is equal to m | Р / Р and 3 where Р (is the noise power in a certain frequency band, P is the measured signal power. With the measured Year and the known P, the measured signal power is determined. The reference wideband noise generators generate a uniform wideband noise in the frequency range from units of kilohertz to units of gigahertz, which allows to expand the frequency range and increase the speed of the device due to the search-free modulation index. 1 Il.

Description

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The invention relates to a radio measuring technique and can be used in the development of means for measuring the power of signals.

The purpose of the invention is to expand the frequency range and improve speed while simplifying the device.

The drawing shows a block diagram of a device for measuring the power of signals.

The device contains a source 1 of the measured signal, a reference generator 2 of broadband noise, an adder, and a meter 4 of the modulation index. The outputs of the source 1 of the measured signal and the reference generator 2 of the wideband noise are connected to the inputs of the adder 3, the output of which includes the meter 4 of the modulation index.

The device works as follows.

From the source 1 of the measured signal

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CG - frequency band in which

measurement of signal modulation index by noise is performed;

Rd - signal power; 2 - coefficient taking into account

contribution to the measurement result of the left and right noise signal from the frequency of the signal. With a known noise power in a bandwidth f and a measured modulation index, the signal power is measured. With a known signal strength and measured modulation index, the noise power in the band d is measured.

The reference wideband noise generators generate uniform broadband noise across the band in the frequency range from units of kilohertz to units of gigahertz, and are characterized by simplicity of design and stability of the noise spectral density, which allows, without complicated construction, to extend the frequencies

the signal is fed to the input of the adder 3.25 ny range, increase speed

at the expense of a non-searchable modulation index.

Claims (1)

Invention Formula A device for measuring signal power containing a measured signal source connected to a first input of an adder, the output of which is connected to a modulation index meter, characterized in that, in order to expand the frequency range and increase performance while simplifying the device, a reference oscillator is connected to the second input of the adder broadband noise. the second input of which receives a signal in the form of broadband noise, the frequency range of which contains the frequency of the measured signal. In adder 3, the measured signal is summed with the measured data, while the total signal is modulated in amplitude and phase so that the square of the modulation index is equal to 2C., H PS Pg where the measured index is FM or AM; Р 2Ск “If is the noise power in the band; power spectral density Q noise; GO