SU943607A1 - Device for measuring uhf signal low levels - Google Patents

Description

CS) DEVICE FOR MEASURING THE MASH OF LEVELS OF ULTRA-HIGH-FREQUENCY SIGNALS

one

The invention relates to a technique of measuring at ultrahigh frequencies and can be used to measure small signal levels, such as noise.

A device for measuring small levels of microwave signals, comprising a series-connected directional coupler, a microwave receiver, a coherent detector and an indicator, as well as a pulse noise generator connected to the second input side of the directional coupler of the HP, is known.

However, the known device does not provide measurement with high accuracy in the presence of pulsed synchronous interference with a known period of the next.

The purpose of the invention is to improve the accuracy of measurements in the presence of pulsed synchronous noise with a known period of following.

The goal is achieved by the fact that a microwave key is connected to the input device, the output of which is connected to the first input arm of the directional coupler, and between the microwave input key and the input of the pulse noise generator a series of interfering interference unit, a delay element and a pulse modulator are connected, the first output of which is also connected to the control input of the microwave key, and the second output - to the reference input

IS coherent detector.

The drawing shows a block diagram of the device.

Claims (1)

A device for measuring small 20 levels of microwave signals comprises a serially connected directional coupler 1, a microwave. Receiver 2, a coherent detector 3, an indicator i. 39 and also a pulse noise generator 5 connected to the second input path of the directional coupler 1, a high-frequency electronic switch 6, an interference suppression unit 7, a delay element 8, and a pulse modulator 9 "The device operates as follows. When the meter is operating, the input to the ultra high frequency receiver 2 is alternately supplied either by a measured signal via an ultra high frequency electronic key 6 or by signals from a pulsed noise generator 5 (compare a high frequency electronic key 6 electronic key at this time with a pulsed electronic key 6 and a pulse noise generator square wave from a pulse modulator 9. The value of the measured noise signal is determined by the signal level from a standard pulse noise generator 5 at zero to Indicator. Due to the fact that the response time of the upper-high frequency electronic switch 6 is small (tenths of a microsec) and the turn-on time of the pulse noise generator 5 is of the same order as the offset, the offset of the intensity estimate when measured compared to the known one. A synchronous periodic disturbance by the interfering block 7 generates a video pulse that is delayed by an amount approximately equal to or less than the period of the disturbance following delay element 8, and synchronizes the pulse the modulator 9 is in such a way that the microwave electronic key 6 is closed for the duration of the interference and the noise signal from the pulse noise generator 5 is supplied to the microwave receiver. Pulse noise generator 5 can be performed on a avalanche-transit diode or another type of microwave diode, and an active quadrupole, such as a microwave low-noise amplifier made on a low-noise TWT, can be used as a microwave high-frequency electronic key 6. This device allows you to measure low levels of noise signals in the presence of powerful impulse noise, while the accuracy is maintained as in the absence of interference. Apparatus of the Invention A device for measuring small levels of microwave signals comprising a series-connected directional coupler, a microwave receiver, a coherent detector and an indicator, and a pulse noise generator connected to a second input arm of a directional coupler, characterized in that pulse synchronous noise with a known period of the following, the device includes a microwave high-frequency key, the output of which It is connected with the first input side of the directional coupler, and between the microwave input of the electronic key and the input of the pulse noise generator a series of interfering interference unit, a delay element and a pulse modulator are connected in series, the first output of which is also connected to the control input of the microwave electronic key and the second output to the reference input of the coherent detector. Sources of information taken into account in the examination 1. US Patent No. 3 09827, cl. G 01R 27/04, published 1968 (prototype).