SU1035817A1 - Device for checking sensivity of side channel in radio receivers - Google Patents

Description

a band amplifier, the output of which is connected to the input of a frequency discriminator, the output of which is connected to the second input of the second element NOT-AND, the input of the inverter, the second inputs of the correlator and the first element NOT-AND connected to the output of the first amplitude comparator, the output of the inverter connected to the first input of the third of the coincidence element, the output of the constant voltage source is connected to the first input

The third element is NOT-AND and the second input of the third element is a match, the output of which is connected to the second input of the third element, the output of which is connected to the second input of the second element NOT-AND and the first input of the fourth element NOT-AND, the second input of which is connected to the output of the frequency discriminator, and the output is connected to the input of the control unit.

The invention relates to radio equipment and can be used for monitoring the performance of narrowband communication radio receivers without disturbing the reception of a useful signal. A device for monitoring the sensitivity of side channels in radio receivers is known, which contains a control block, the reference signal generator whose input is connected to the output of the control unit, the first amplitude Comm, whose first input is connected to the output of the monitored radio receiver through the first switch, the first driver of the reference signal whose output is connected the second input of the first amplitude comparator are serially connected start pulse shaper, the first and second triggers, and the input The start pulse generator is connected to the output of the first amplitude comparator, the decoder, the first and second elements of the match, the indicator, and the inputs of the decoder are connected to the first and second outputs of the first and second triggers, the first and second outputs of the decoder are connected to the first inputs of the first and second elements matches, with the second inputs of which the limiting output of the reference signal generator is connected, and the outputs of the first and second elements of the match are connected respectively to the inputs of the Error indicator Regularity and Norm, the third output of the decoder is connected to the indicator input Not norm and to the input of the control unit t, however, the known device allows automatic monitoring of the operability of the connected radio receivers and monitoring the sensitivity of the side receiving channels of the radio receivers for compliance with the established standard only if there is no useful signal, t . when removing the radio from Duty, since the test and useful signals are incompatible. In addition, this device does not allow the process of monitoring to evaluate (measure) the performance of the radio receiver and to compare it with the established form or with the corresponding value specified in the technical passport of this radio receiver. The purpose of the invention is to reduce the monitoring time by estimating the sensitivity using a broadband signal without disturbing the reception of the useful signal. The goal is achieved by the fact that the first amplitude comparator, the first input of which through the first switch is connected to the output of the controlled radio receiver, is the first driver in a device for monitoring the sensitivity of side channels in radio receivers, which contains a control unit, a reference signal generator, which input is connected to the output of the control unit. the reference signal, the output of which is connected to the second input of the first amplitude comparator, connected in series to the trigger pulse driver, ne the second and second triggers, the input of the start pulse pulse is connected to the output of the first amplitude comparator, the decoder, the first and second elements of the match, the indicator, while the inputs of the decoder are connected to the first and second outputs of the first and second triggers, the first and second outputs of the decoder , are connected to the first inputs of the first and second elements of coincidence, the second inputs of which are connected to the limiting output of the reference signal generator, and the outputs of the first and second elements of coincidence are connected With the inputs of the indicator Not good condition and Norm, the third output of the decoder is connected to the input of the indicator Not normal and to the input of the control unit, a wideband signal generator, the second and third switches, a delay line, a second amplitude comparator, a corrector, four NOT-elements, additional indicator, mixer, bandpass amplifier, frequency discriminator, second reference signal conditioner, inverter, third coincidence element, constant voltage source, filter and valve, while the output of the reference signal generator the a la is connected to the first mixer input and the generator input of the broadband signal, the output of which is connected to the input of the delay line, and through the valve and the second switch to the input of the monitored radio receiver, the output of the delay line is connected to the first input of the second amplitude comparator, the second input of which is connected with the output of the second form of the reference signal, the output of the second amplitude comparator is connected to the first input of the first element NOT-AND, the output of which is connected to the first input of the second element NOT-AND whose output It is connected to the indicator input and to the second inputs of the first and second coincidence elements, while the second mixer input is connected to the filter output, the input of which through the third switch is connected to the input of the monitored radio receiver, the output of the mixer is connected to the input of the band amplifier, the output of which is connected to the input frequency discriminator, the output of which is connected to the second input of the second element NOT-AND the input of the inverter, the second inputs of the correlator and the first element NOT-AND connected to the output of the first amplitude 10 7 th computer RATOR, the inverter output is connected to the first input of the third element of the match, the output & d of the constant voltage source is connected to the first input of the third non-AND element and the second input of the third coincident element whose output is connected to the second input of the third non-AND element whose output connected to the second input of the third element NOT-AND, the output of which is connected to the second input of the second element NOT-AND and the first input of the fourth element NOT-AND, the second input of which is connected to the output of the frequency discriminator, and the output connected to the input Lok control. The drawing shows the structural electrical circuit of the device. The device contains a control unit 1, a reference signal generator 2, a controlled radio receiver 3, a first amplitude comparator 4, a first reference signal generator 5, a trigger pulse generator 6, an indicator 7, a first trigger 8, a second trigger 9, the decoder .10, the first element 11 matches, the second element 12 matches, input Fault 13, input Norm 1, input Not norm 15., generator 1b of wideband signal, first, second and third switches 17, 18 and 19 with responsibly, delay line 20, second amplitude comparator 21, correlator 22, first element NOT-23, second element NOT-2, additional indicator 25, third element NOT-AND 26, fourth element, moment NOT-27, mixer 28, a band-pass amplifier 29, a frequency discriminator 30, a second reference frequency driver 31, an inverter 32, a third coincidence element 33, a constant voltage source 3, a filter 35., a gate 36. (The device works as follows. The control unit 1 performs a smooth change in the frequency of the generator 2 of the reference signal with a limit switch in a controlled frequency range, according to which the frequency of the broadband signal also changes. The frequency range of the monitoring of side reception channels, as a rule, is within O, where Q is the operating frequency of the radio receiver. The frequency f of the generator 2 of the reference signal is set to the upper limit of the control range f. The input of the monitored radio receiver 3 from the output of the generator 16 is transmitted through the gate B and the switch 18 to a wide signal level equal to a predetermined rate x on the sensitivity of the spurious channels. the output of the controlled radio receiver 3 signal y. This signal through the switch 19 is fed to the input of the amplitude comparator k and is compared with the level of the reference signal y produced by the shaper of the reference signal. In this case, the following three cases may occur. In the event of a malfunction of the monitored radio receiver 3, the difference signal 4U y - VO at the output of the amplitude comparator k is negative in the controlled frequency range 2 fi in this case, the comparing does not occur at the amplitude comparator Negative voltage y applied to the driver 6 for the trigger pulse, which is blocked by negative voltage and, therefore, from its output, not a single pulse of the sharp-pointed form will go to the first three germs 8, the first and second triggers 8 and 9 are in the initial state 1 1. In this case, the three outputs of the decoder 10 are in the following states: and 0; U2 0; Uj 0. At the same time, the negative voltage goes to one of the inputs of the correlator 22, prohibiting the input of the first element - AND 23 and the input of the inverter 32. The voltage at the output of the inverter 32 will be positive and fed to one of the inputs of the third matching element 33. The voltage and - point 3 of a constant positive voltage is applied to another input of the third element 33 coincidence and the first input of the third element NOT - AND 26 The third element 33 coincides with the voltage from its output to the first input of the fourth element NOT - AND 27 and prohibiting the input of the third element NON-26. Therefore, the voltage at the output of the third element NON-AND 26 is zero. At the same time, the signal of the current frequency f 2 output and generator 2 of the reference signal is fed to one of the inputs of the mixer to the second input of which through the switch 17 and the filter 35 receives a useful signal with a frequency f. The filter 35 prevents the signal from the output of the generator 16 of the wideband signal from entering the mixer 28. The oscillations of the difference frequency 2- .. obtained in the mixer are allocated by the band-pass amplifier 29 and then passed to the frequency discriminator 30, where the oscillation frequency f is converted to a voltage Otsd, depending on the frequency deviation fI - OT of the fn value in accordance with the discriminatory characteristic of the frequency discriminator 30. Positive voltage 1). enters the prohibitory entrances of the fourth and second elements NON-27 and. Consequently, in the process of tuning the generator 2 of the reference signal by the control unit 1, until the frequency f2 reaches the frequency fp of the main channel, the elements Ht-27 and 2 do not pass a voltage on their outputs, since the voltage 0c) 0 is applied to their inhibiting inputs, When a frequency of 2 frequencies is reached, the main | Channel for receiving it and the source voltage of a constant positive voltage pass to the output of the fourth element NOT-27, turning off the control unit 1. At the same time, the voltage P is applied to the prohibiting input of the second element NOT-AND 2 and, therefore, the voltage applied to the first input of this element can pass to its output. I Simultaneously with the arrival of the wideband signal X at the input of the monitored radio receiver 3, it arrives at the input of the delay line 20 necessary to compensate. The signal delay in the path of the monitored radio receiver 3. In the amplitude comparator 21, the signal x is compared with the level of the reference signal Q produced by the former 31 of the reference signal and multiplied as a difference to the second input of the correlator 22. The multiplier is reproduced in the correlator 22 and integration (convolution) of the input signals dv and 4v at the frequency fg and their detection. If the monitored radio receiver 3 is healthy, the level of the minimized signal is constant, and its value is proportional to the maximum value of the correlation function between the two input signals. In the case of a detuning of the circuits of the radio cascades, resulting in parasitic phase modulation, a change in the sensitivity of the radio receiver, etc. the level of the minimized signal will be i different., On the additional indicator 25, the operability of the monitored radio receiver 3 with a high power level is fixed, which is due to it. the use of two amplitude comparators, and is compared with the established norms or with the corresponding value specified in the data sheet for this tool. In addition, the signal from the output of the relay cor- ractor 22., passed through the elements NON-AND 23 and 2k, is fed to the inputs of the elements 11 and 12, coincidence. At the time the voltage from the output of the correlator 22 arrives at the inputs of elements 11 and 12 of the coincidence element 11, the coincidence element 11 is activated, turning on the indicator 7 and is displayed on the light panel. Signal Fault 13. Thus, in the event of a malfunction of the monitored radio receiver 3, the speed of the proposed device, in comparison with the known one, is doubled, since there is no need to rebuild the generator 2 of the reference signal by the control unit to the frequency, i.e. to the lower frequency of the radio control, as in the well-known device is low. Product panel Fault switches on when the generator 2 reaches the reference signal, the frequency is - ,. . . . If the sensitivity of the side channels of the radio receiver reception is satisfied at the established rate, if the frequency of the generator 2 of the reference signal coincides with the frequency f of the main reception of the monitored radio receiver 3, the set level of excess signal is exceeded and a positive signal is generated at the output of the amplitude controller k. of the first element, NOT-AND 23. In addition, the signal l, having passed the inverter 32, arrives at the element 33 of coincidence. The voltage at the output of this element, which prohibits the third element NOT-AND 2, is equal to zero. The voltage source 3k of a constant positive voltage passes to the output of the third element NOT-AND 26 and enters to prohibit the {| (input of the second element NON-2k. And, therefore, the extra-full indicator 25 is turned off. At the same time, a positive 4U P signal arriving at the 6 6 7 7 8 start-up pulse generates one pointed pulse, transferring the riggers 8 and 9 from state 1, 1 state O, 1. At the same time, to the output of the decoder 10 voltage Uj - O, a 0. After the frequency of the generator 2 of the reference signal coincides with the frequency of the main reception channel of the controlled radio receiver 3, the voltage will be negative, because the value is 0 O, where f (, Voltage O is applied to the prohibitory input of the second of the non-i 2k element. However, the same input has a voltage source 3 of a constant positive voltage, which by an absolute value is greater than the voltage and (| e. therefore, the signal from the output of the correlator 22 cannot pass to the input of an additional Indicator 25, as well as to the inputs of elements 11 and 12, coincidence. Therefore, the additional indicator 25 and indicator 7 are off. At the end of the control range at frequency f, the output of the limit switch of the generator 2 of the reference signal to the terminals 11 and 12 of the coincidence enters the voltage. The second coincidence element 12 is triggered, the indicator 7, Vkg OCh, at the input 1k of which the Norma signal is highlighted, on the inputs 13 and 15 is not the signal. In case of dissatisfaction of the sensitivity of the secondary reception channels of the radio receiver at the frequency of the main reception channel and at the frequency of one side channel, the sensitivity of which does not satisfy the established rate (or at the frequency of two side reception channels J, the output of amplitude comparator 1 is twice the signal AU O, and at the output of the driver 6, the start pulse Two pulses of a pointed shape are produced, transferring the triggers 8, and 9 from the initial state 1, 1 to the state 1, О, as a result of which the voltage U U 1 0 occurs at the output of the decoders. When voltage U occurs. The O signal on the input 15 of the indicator 7 is illuminated. The norm. The control block 1 is turned off by the voltage and Ф О, On the inputs 13 and the signal is not given, because the voltage U .. The additional indicator 25 is turned off as in the case of satisfaction

side channels receiving the radio set rate.

Thus, the application of the device to the device itself, e, t, automatically monitors the performance5 of the connected radio receivers, as well as the sensitivity of their side channels of reception without disturbing the reception of the useful signal. In addition, in case of failure of the monitored radio receivers, the speed of the proposed device is doubled due to the inclusion of the scoreboard.

when the frequency of the generator reaches the reference signal frequency of the main reception channel.

The obtained data for monitoring the specified parameters of radio receivers are especially important when making operational decisions to ensure the normal functioning of radio communications deployed at receiving radio centers in difficult interference situations, in particular when solving issues of electromagnetic compatibility of radio receivers and radio transmitters.

C) (one

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18

Claims (1)

DEVICE FOR CONTROLLING SENSITIVITY OF ADVERSE CHANNELS IN RADIO RECEIVERS. comprising a control unit, a reference signal generator, the input of which is connected to the output of the control unit, a first amplitude comparator, the first input of which is connected through the first switch to the output of the monitored radio receiver, a first reference signal shaper whose output is connected to the second input of the first amplitude comparator, shaper connected in series start pulses, the first and second triggers, while the input of the start pulse shaper is connected to the output of the first amplitude comparator, a decoder, first and second coincidence elements, an indicator, while the decoder inputs are connected to the first and second outputs of the first and second triggers, the first and second decoder outputs are connected to the first inputs of the first and second coincidence elements, the limiting output of the reference signal generator is connected to their second inputs , and the outputs of the first and second elements. matches are connected respectively to the inputs of the indicator '' Fault and Normal, the third output of the decoder is connected to the input of the indicator Non normal and to the input bl control, characterized in that, in order to reduce the monitoring time by assessing sensitivity with a broadband signal without disturbing the reception of a useful signal, a broadband signal generator, second and third switches, a delay line, a second amplitude correlator, four elements are introduced into it NAND, additional indicator, mixer, strip amplifier, frequency discriminator, second driver of the reference signal, inverter, third coping element, constant voltage source, filter p and a valve, while the output of the reference signal generator is connected to the first input of the mixer and the input of the broadband signal generator, the output of which is connected to the input of the delay line, and through the valve and the second switch to the input of the controlled radio receiver, the output of the delay line is connected to the first input the second amplitude comparator, the second input of which is connected to the output of the second driver of the reference signal, the output of the second amplitude comparator is connected to the first input of the correlator, the output of which is connected to the first by the course of the first NAND element, the output of which is connected to the first input of the second NAND element, whose output is connected to the indicator input and to the second inputs of the first and second coincidence elements, while the second mixer input is connected to the filter output, the input of which is connected through the third switch with the input of the monitored radio, the mixer output is connected to the input „SU /., 1035817 of a strip amplifier, the output of which is connected to the input of the frequency discriminator, the output of which is connected to the second input of the second NAND element, input inverter, the second inputs of the correlator and the first NAND element are connected to the output of the first amplitude comparator, the inverter output is connected to the first input of the third coincidence element, the output of the constant voltage source is connected to the first input of the third NAND element and the second input of the third coincidence element, the output of which connected to the second input of the third element NAND, the output of which is connected to the second input of the second element NAND and the first input of the fourth element NAND, the second input of which is connected to the output of the frequency dis riminatora, and an output connected to the input. control unit.