SU1169181A1 - Device for detecting intrasystem radiointerferences in communication channels - Google Patents

Description

The invention relates to a technique for detecting interference in the field of radio communications and can be used to provide electromagnetic compatibility (EMC) of radio-electronic station complexes (RES).

The purpose of the invention is to improve the accuracy of testing and detection of sources of interference.

The drawing shows the structural scheme of the device for detecting internal system interference in communication channels.

The device for detecting intra-system radio interference in communication channels ⁵ contains an indication unit 1, a control unit 2, a fading simulator 3, the first AND 4 element, a radio transmitter power control unit 5, a switch 6, a delay line 7, a correlator 20, a second And 9 element, threshold block 10.

The device works as follows

ί In the initial state, the And 4 25 and 9 elements are locked, the signal from the output of the simulator 3 is not fed to the input of the radio transmitter power control unit 5 and to the input of the correlator 8.

If it is necessary to control the occurrence of intra-system interference or the testing of EMC complexes of radio electronic systems from the control unit 2, the enable signal is sent to the first inputs of the And 4 and 9 elements. At. This output of the simulator 3 fading through the first element And 4 to the input of the power control unit 5 is supplied with a current varying randomly. Law of measure- ₄ θ

is determined by the type of radio link in which the device is used.

Depending on the position of the switch 6, the device can operate in two modes: monitoring and testing.

In the control mode, the power adjustment of the radio transmitter radiation - a potential source of intra-system interference - is carried out (depending on the radio transmitter design) within a few percent of the nominal, i.e. a value at which the quality of transmitted useful information practically does not deteriorate.

In the test mode using block 5, the radiation power of the radio transmitter connected to the output of the device varies over the entire range of values.

ι

From the monitored (tested) radio receiver (not shown) to the input of the device, a mixture of signal is received with noise, which is transmitted through the second element 9 to the second input of the correlator 8, and simultaneously the first input of the correlator 8, which is the reference, receives the signal from the fading simulator 3 the first element And 4 and line 7 delay. The delay time is chosen equal to the hardware delay of the test signal in the controlled (tested) equipment. In the case of intra-system radio interference affecting the radio receiver, a response appears at the output of the correlator 8, which is fed to the input of the threshold unit 10. If the latter is triggered, the display unit 1 signals the presence of internal system interference. Simultaneously from the output of the threshold unit 10, the signal enters the input of the control unit 2 and turns it off, thereby turning off the device. On this control (test) ends. If the threshold unit 10 does not work, then the cycle of control (testing) is repeated. The time of control (testing) is limited by the control unit 2.

The invention allows to detect intra-system interference without interruption in the transmission of information.

Claims (2)

THE DEVICE FOR DETECTION OF THE DUTY SYSTEM RADIO COMPONENTS IN COMMUNICATION CHANNELS, containing the display unit, two AND elements and the control unit, the output of which is connected to the first inputs of the AND elements, characterized in that, p. In order to improve the accuracy of testing and detecting sources of interference, a fading simulator is introduced into it, the output of which is connected to the second input of the first element I, the power control unit of the radio transmitter whose inputs are connected to the output of the first element I through a switch, and the series-connected delay line whose input connected to the output of the first element, And, the correlator, the second input of which is connected to the output of the second element, And, the second input of which is the input of the device for detection of internal systems radio interference in communication channels, and a threshold unit, the output of which is connected to the inputs of the display unit and the control unit. <c shash 3 one 1169181 2