SU1626417A2 - Device for monitoring mobile radio stations - Google Patents

Abstract

This invention relates to a radio technique. The purpose of the invention is to increase the reliability of monitoring by reducing the level of interference. A device for monitoring radio stations of mobile objects contains a radio transmitter 1, a radio receiver 2, controlled attenuators 3 and 4, drivers 5 and 6, a delay element 7, a driver 8, a control unit 9, a command receiver 10, a threshold unit 11, a receiver 12 signal at a stationary station the station numbers and the registration unit 13, and at the mobile station a radio receiver 14, a radio transmitter 15, a control signal receiver 16, a threshold unit 17, an OR element 18, a driver 19, a shaper 20, a power level meter 21, an And 22 element, a trigger 23, a rear element rzhki 24, switching unit 25, the equivalent of 26 antennas. The introduced set of blocks allows to reduce the level of interference by excluding the radiation of power on the air during monitoring by connecting the radio transmitter 15 to the equivalent of 26 antennas, which, in turn, leads to the achievement of the goal. 1 il. (L oe to o yu

Description

The invention relates to a radio communication technique, can be used to control the technical condition of radio stations located on mobile objects, and is an improvement of the device according to aut. No. 1185626.

The purpose of the invention is to increase the reliability of monitoring by reducing the level of interference.

The drawing shows a structural electrical circuit of the proposed device.

The device for monitoring radio stations of mobile objects contains at a stationary station a radio transmitter 1, a radio receiver 2, a first and second controlled attenuator 3 and A, a first and second driver 5 and 6 of the control signal, a delay element 7, a driver of the control signal 8, a control block 9, a receiver 10 commands threshold unit 11, receiver 12 of the signal of the station number, block 13 of registration, at the mobile station - radio receiver 14, radio transmitter 15, receiver 16 of the control signal, threshold block 17, element OR 18, driver 19 of the number signal station, driver start command generator 20, power level meter 21, element 22, trigger 23, delay element 24 switching unit 25 and the equivalent of 26 antennas.

The device works as follows.

In the initial state at the stationary station, the second driver 6 of the control signal outputs to the control input of the second controlled attenuator 4 a signal at which its attenuation is minimal. The trigger 23 at the mobile station is in the zero state. Logical signals

O and logical 1 from the direct and inverse outputs of the trigger 23 are received respectively at the first and second control inputs of the switching unit 25. With this combination of control inputs, switching unit 25 connects the high-frequency output of the power level meter 21 to its second high-frequency output. When an external influence occurs, the starting command generator 20 (for example, when a special button is pressed) begins to generate a turn-on signal of the radio transmitter 15. At the same time, when the driver 20 is turned on

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the start command on its control output appears a signal that arrives at the first input of the trigger 23 and translates it into a single state.

The signals of logic 1 and logic O from the direct and inverse outputs of flip-flop 23 are fed to the first and second control inputs of switching unit 25, respectively. With this combination of signals at the control inputs, switching unit 25 connects the high-frequency output of the power level meter 21 to its first high-frequency output, to which the equivalent of 26 antennas is connected. The generated signal for turning on the radio transmitter 15 from the output of the starting command generator 20 enters the delay element 24, where this signal is delayed by the time required for the switching unit 25 to operate. From the output of delay element 24, this signal through the element OR 18 is fed to the input of a radio transmitter 15, which is turned on. The signal power emitted by the radio transmitter 15 is monitored by the power level meter 21, and if the value at the radiated power corresponds to the nominal level, then a signal is generated at the control output of the meter 21, according to which the start command generator 20 starts to generate a command indicating that the radio transmitter 15 is healthy.

If the power emitted by the radio transmitter 15 is lower than the nominal, then the corresponding signal from the meter 21 of the start command generator 20 starts to generate a signal indicating its malfunction. In the process of monitoring the level of power emitted by the radio transmitter 15, the high-frequency output of the meter 21 through the switching unit 25 is connected to the input of the equivalent of 26 antennas. Therefore, the high-frequency signal generated by the radio transmitter 15, during the entire time of the power control, enters the antenna and is not radiated, but is scattered in the equivalent of 26 antennas. After the end of the monitoring of the radiation power, the signal on the monitoring result from the control output of the meter 21 also enters the second input of the trigger 23 and converts it to the zero state. AT

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As a result, signals O and 1, respectively, appear on the first and second control outputs of switching unit 25. As a result, high-frequency output of meter 21 is connected to the second output of switching unit 25 to which the antenna is connected.

The information signal about the measured power level, generated by the shaper 20, is fed to the delay element 24, where it is delayed by the time required for switching the switching unit 25. From the output of delay element 24, this signal through the element OR 18 is fed to the modulation input of the radio transmitter 15 and is radiated. This signal is received and detected by the radio receiver 2 of the fixed station, allocated by the command receiver 10 and recorded in the registration unit 13. After that, a command is transmitted from the control unit 9, which turns on the control signal generator 8 and the first control signal generator 5, and after the delay time t ,, determined by the delay element 7, the second control signal generator 6 is activated. The control signal generator 8 includes a radio transmitter 1, the carrier frequency of which is modulated by the control signal. The output voltage of the first control signal generator 5 rises linearly, and the attenuation of the first controlled attenuator 3 decreases, and consequently, the value of the power emitted by the stationary station gradually increases.

The control signal is received by the mobile station's radio receiver 14, the control signal receiver 16 is triggered, and when the input signal reaches a level sufficient to trigger the threshold unit 17, the output of the last element, and therefore the output element I 22, appears 19 signal station numbers. The radio transmitter 16 is switched to the mode of transmitting the number of the mobile station. After starting the first driver 5, the control signal generator 6 is turned on via delay element 7. The delay time t must correspond to the sum of the time required for the mobile station to switch from receive mode to transmission mode and trigger the receiver 12 of the station number signal.

The output voltage of the second driver 6 of the control signal is controlled by the attenuation value of the second controlled attenuator 4, i.e. the signal transfer ratio from the antenna to the input of radio receiver 2 changes. If the sensitivity of the controlled radio receiver 14 is normal, the mobile station number is received at a fixed station and is decoded by the receiver 12 of the signal of the station number with the attenuation value of the second controlled attenuator 4, which when the radio transmitter 15 is operational, corresponds to the level signal to the radio input 2 below threshold of threshold unit 11. In this case, in a block 13 the registration fixed radio serviceability and room 14 checks emoy mobile station. If the sensitivity of the radio receiver 14 does not correspond to the norm, then the operation of the threshold unit 17 occurs at a higher power level at the output of the first controlled attenuator 3, i.e. at a later point in time. The second control attenuator 4 is less jammed in this case and when decoding the number of the mobile station, a signal is generated at the output of the threshold unit 11, indicating a malfunction of the station under test, which is recorded in the registration unit 13.

Claims (1)

Invention Formula A device for monitoring radio stations of mobile objects by author. St. No. 1185626, distinguished by the fact that, in order to increase the reliability of control by reducing the noise level, a switching unit was inserted between the information output of the trigger command generator and the second input of the OR element at the mobile station, a switching unit was inserted between the high-frequency output of the power meter and the antenna input , a trigger and the equivalent of the antenna are also introduced, connected to the high-frequency output of the switching unit, the first and second controlled inputs of which are connected respectively to the inverse and 716264178 direct outputs of the trigger, the first driver of the start command and the second inputs of which are connected by the corresponding output of the level meter With extra power output.