SU1658405A2 - Device for testing mobile radio stations - Google Patents

Description

one

(61) 1185626 (21) 4728685/09 (22) 08.08.89 (46) 06.23.91. Bul No. 23 (72) A.G. Salikov, L.P. Balakin, A.S. Colon, O.N. Melnichenko and Ye.B. Sinelnik (53) 621.396.664 (088.8)

(56) USSR Author's Certificate No. 1185626, cl. H 04 B 17/00. 1984

(54) DEVICE FOR MONITORING RADIO STATIONS OF MOBILE OBJECTS

(57) The invention relates to radio communications and can be used to monitor the technical condition of radio stations. purpose

the invention is an increase in the reliability of control by eliminating the mutual influence of controlled radio stations. A signal at the timer output appears through a period of time longer than the monitoring time of one mobile station. During this entire period, the corresponding elements AND on stations with a mismatched code numbers will be blocked. Therefore, during a specified time, none of the mobile stations can start the monitoring cycle and thus disrupt the started monitoring cycle of one of the mobile stations. 1 il.

The invention relates to radio, can be used to monitor the technical condition of radio stations located on various mobile objects, and is additional to the device according to the author. St. No. 1185626.

The purpose of the invention is to increase the reliability of monitoring by eliminating the mutual influence of the controlled radio stations.

The drawing shows a structural electrical circuit of the device for monitoring radio stations of moving objects.

The device contains on the stationary part a radio transmitter 1, a radio receiver 2, controlled attenuators 3 and 4, drivers of 5 and 6 control signals, delay element 7, monitor control driver 8, control unit 9, command receiver 10, threshold unit 11, number signal receiver 12 stations, registration block 13, element OR 14, memory block 15, timer 16 and additional delay element 17, at the mobile station, radio receiver 18, radio transmitter 19. control signal receiver 20, power level meter 21, elements 22-24, threshold block 25, elements AND LIE 26-28, timer 29, receiver 30 of the signal of the station number, block 31 of comparison, block 32 of the memory, trigger 33. delay element 34, driver of the start command 35, generator of the signal of the station number.

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. Block 15 is reset and ready to write the code of the number of the mobile station. Timer 16 is ready to go. In timer 16, the code of the control time interval ti is entered, equal to the sum of the reception time by the receiver 10 koI

c eat

00

I

k

mand of the information signal about the technical condition of the radio transmitter 19 and the time of forming the start signal of the control unit 9. On the mobile stations in the receiver 30 of the signal of the station number, a zero code is recorded. Trigger 33 cleared. The AND 24 element is unblocked by a high level signal coming from the inverse output of the trigger 33. The AND 23 element is blocked by a low level signal from the direct output of the trigger 33. The code of the specific station number is recorded in the memory block 32. At the first output of the comparator block 31, a high level signal is present (a foreign code is received).

The start signal of the control cycle of one of the mobile stations arrives at the second input of the AND 24 element and from its output goes through the OR element 27 to the input of the generator 36 of the signal of the station number. Shaper 36 generates a signal of the number of this mobile station, which through element OR 26 arrives at the input of radio transmitter 19 and is radiated. The trigger signal from the output element And 24 also enters the input element 34 of the delay. The delay time must be not less than the time of formation of the signal of the given station number in the driver 36. After the specified delay time, the start signal enters the start input of the start command generator 35. The imaging unit 35 switches on the radiation of the radio transmitter 19 through the element OR 26, and also switches on the power level meter 21. The power of the signal emitted by the radio transmitter is controlled by the meter 21. Depending on the results of the control, the driver 35 generates a corresponding start command, which through the OR element 26 enters the input of the radio transmitter 19 and is radiated. A high frequency signal carrying information about the number of the mobile station that started the monitoring cycle is received and detected by the radio receiver 2 of the fixed station and allocated by the receiver 12 of the signal of the station number. The code of the number of the mobile station that started the monitoring cycle (always starts from 1, for example 1011) is recorded in registration block 13, and is also recorded in block 15. If, after the time interval ti expires, command receiver 10 does not generate a start signal for control unit 9 the radio transmitter 19 is not received, then at the output of the timer 16 a signal turns on, which block 15 is zeroed in. Also this signal through the OR 14 element is fed to the second input of timer 16 and zeroes it (timer 16 in the initial state is ready to a new cycle of work). A signal containing information about the health of the radio transmitter 19 is also received and detected by the radio receiver 2 of the fixed station, allocated by the receiver 10 of the commands and recorded in the recording unit 13. The start signal generated by this signal from control unit 9 is fed to the input of additional element 17 of the holder, the inputs of block 15 and element OR 14. With this signal, block 15 generates in its output a code of the number of the monitored mobile station, which is fed to the input of radio transmitter 1 and is radiated. Also, the start signal of the control unit 9 through the element OR 14 is fed to the input of the timer 16 and zeroed it. The delay time of the trigger signal of control block 9 t2 must be greater than or equal to the formation time

0 of the code of the station monitored by the unit 15 and its transmission by the radio transmitter 1. The signal carrying information about the number of the monitored mobile station is received and detected by the radio receivers of 18 all mobile stations and recorded in the receivers 30 of the signal of the mobile station number. After this, the second output of the receiver 30 forms signal that arrives at the recording input

0 G trigger 33 and translates it into a single state. The low level signal from the inverse output of the trigger 33 locks the And 22 and 24 elements, and the And 23 element is unlocked by the high level signal from the direct output

5 trigger 33. The code of the number of the monitored mobile station recorded in the receiver 30 from its information outputs goes to the information inputs of the comparison unit 31, the other information inputs of which receive the code of the number of this mobile station from the memory block 32. If the received code coincides with the code of the given mobile station (i.e. there is a monitoring cycle of the given mobile station),

5 then, at the second output of the comparator unit 31, a signal appears which, through the OR element 28, is fed to the inputs of the trigger 33 and the receiver 30 of the signal of the station number. Trigger 33 is zeroed, causing

0, the low and high level signals from its direct and inverse outputs block AND 23 and unlock AND elements 22 and 24, and also the receiver 30 of the signal of the station number is zeroed. If the received code

5 does not coincide with the code number of this mobile station, then a signal appears at the output of comparison unit 31, which, through element 23, starts timer 29. The output signal of timer 29 appears after a time t3 that is longer than the monitoring time of one mobile station. During all this time, the elements of And 22 and 24 on the stations with non-coincident code numbers will be blocked. Therefore, during the specified time, none of these mobile stations can start a monitoring cycle and thus disrupt the started monitoring cycle of one of the mobile stations. After the specified time interval 1h, the output of the mobile station timer 29 with a mismatched number code generates a signal , which zeroed the timer 29, and through the OR element 28, nullified the receiver 30 of the signal of the station number and the trigger 33. As a result, the elements And 22 and And 24 are unblocked at the specified stations with the signal from the inverse output of the trigger 33 and blocked nt and 23 (signal from the direct output of the trigger 33). In this case, the monitoring cycle can be started by any of the mobile stations.

At the stationary station, the control unit 9 generates a command using the start signal by which the control signal generator 8 and the first control signal generator 5 are activated, and after the delay time to be determined by the first 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 driver 5 rises linearly, which leads to a decrease in the attenuation of the first controlled attenuator 3, and consequently, the level of the power emitted by the stationary station increases. The control signal is received by the radio receiver 18 at all monitored mobile stations. The receiver 20 of the control signal triggers, and when the input signal reaches a level sufficient to trigger the threshold unit 25, a signal also appears at the output of the latter. However, the start signal of the shaper 36 of the number of the mobile station appears at the output of the element 22 at the monitored mobile station only (the number code coincided with the number of the mobile station). At the other mobile stations, the element 22 will be blocked by a signal from the inverse output of the trigger 33. When a signal appears at the output of the element 22, the monitored mobile station is triggered via the element 27 or 27, the station number 36 signal generator.

After the first control signal generator 5 is launched, the second control signal generator 6 is activated via the first delay element 7. The delay time t3 must correspond to the sum of the time required for the mobile monitored station to switch from receiving mode to transmitting mode and triggering 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. If the sensitivity of the radio receiver 18 at the monitored mobile station is normal, the number of the monitored mobile station is received at the stationary station and decoded by the receiver 12 of the signal of the station number at this attenuation value of the second controlled attenuator 4, which, with a good radio transmitter 19, corresponds to the signal level at the input of the radio receiver 2 below the threshold cf Abate the threshold unit 11. In this case, in the registration unit 13, the operability of the radio receiver 18 and the number of the controlled mobile station are recorded. Also, the code of the station number starts the timer 16 and is fixed in block 15. After time q (since in this case the start signal of control block 9 is absent at the output of command receiver 10) the output of timer 16 produces a signal that zeroes block 15. This the same signal through the element OR 1 zeroed the timer 16. If the sensitivity of the radio receiver 18 at the monitored mobile station does not correspond to the norm, then the threshold unit 25 responds at a later point in time. The attenuation of the second controlled attenuator 4 in this case is less and when decoding the number of the monitored mobile station, the output of the threshold unit 11 generates a signal indicating a malfunction of the monitored mobile station, which is recorded in the registration unit 13.

Claims (1)

Claims of Invention A device for monitoring radio stations of mobile objects according to the author. St. No. 1185626, characterized in that, in order to increase the reliability of the control by eliminating the mutual influence of the monitored radio stations, at the stationary part, the first output of the command receiver is connected to the input of the control unit through the additional delay element introduced, in addition the OR element and the serially connected timer and the memory unit, the output of which is connected to the input of the radio transmitter, the first output of the command receiver is connected to the second input of the memory unit and to the first input of the OR element. The second input is connected to the timer output, and the output is connected to the first timer input, the second input of which is combined with the third input of the memory unit and connected to the receiver output of the station number signal, and the third input is the input of the stationary part of the device, and at each mobile station the element AND is connected to the signal generator of the station number through the input of the second element OR, in addition a memory block and a serially connected signal receiver of the station number, a comparison block, a second AND element, a timer, a third ele ent OR trigger, the third AND gate and a delay element whose output is connected to an input of the start command, block the memory is connected to the second input of the comparison unit, the second output of which is connected to another input of the third element OR, the output of which is connected to the first input the signal receiver of the station number, the second input of which is connected to the auxiliary output of the radio receiver, the second output is connected to another input of the trigger, the other output of which is connected to another input the second element AND, the timer output is connected to its second input, and the output of the third AND element is connected to another input of the second OR element, the first input of the mobile station of the device is the input the memory block, the second input is the other input of the third AND element, the third input is the third input of the timer.