Method for diagnosing communication system

FIELD: radio engineering; serviceability check of communication systems.

SUBSTANCE: proposed method is characterized in that serviceability of communication systems in frequency-adaptive range is evaluated by checking system response to noise situation simulated at its input and its comparison with desired value. To this end time required for tuning to optimal frequency is measured and compared with desired value, and also number of errors is counted and compared with that admissible.

EFFECT: enhanced reliability of estimating serviceability of communication system in frequency-adaptive range.

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The invention relates to the field of radio, namely to control the technical state of the communication systems operating in the frequency-adaptive mode.

Known methods of diagnosis described, for example in the book: automated diagnosis of electronic devices/ Uwimana, WEPOS, Sgerson / edited Vpolicy - M.: Energoatomizdat. 1986. - 216 S. [1], including the formation of the test sequence, converting it according to the law, storing the converted sequence and its comparison with the previously calculated. The difference in transformed and designed sequences indicate the refusal or failure. There is a method implemented in the device diagnostic equipment digital transmission systems copyright certificate of the USSR No. 1734219 declared 6.08.90 published 15.05.92 Bulletin: N 18 [2], which in addition to the above, in the allocation of a pseudo-random sequence after each conversion, the calculation of the mathematical expectation of the number of individual symbols, the variance of the number of occurrence of single characters and the likelihood of single characters and determining the results of the parameters of possible technical conditions of equipment for digital transmission systems. However, the known methods n which provide sufficient reliability of the diagnosis because of the limited time dimension.

The closest in technical essence to the proposed technical solution is the method implemented in the device diagnostic equipment digital transmission systems copyright certificate of the Russian Federation No. 2132594 declared 05.01.98 published 27.06.99, Bulletin No. 18 [3]. Prototype method consists in the formation of pseudo-random test sequence duration 158400 clock pulses and applying it to the input of the transmitting tract, converting it according to the algorithm of signal conversion, subsequent loosening and mixing with signal noise, switching the input of the receiving channel, the reverse transformation, the selection is transmitted pseudo-random sequence at the output of the reception path, its comparison with the original test by counting distorted pulses. At a predetermined algorithm, in excess of the permissible value of the distorted pulses NOsh>NSSwhere NOshthe number of distorted pulses, NSSallowable number of distorted pulses, re-transmission pseudo-random test sequence, this may introduce new and / or excluded previously set conversion pseudo-random sequence depending on the ratio of NOshfor NSSup until not b the children defined unit defective equipment digital transmission systems.

The disadvantage of the prototype is that the restructuring process of adaptive communication system for optimal communication frequency band is considered to be instantaneous, although this requires a certain time of perestroika (tthe reorganizations≤tmax=10-60) [4] (p.22, p.95, p.98), where tmax- the maximum time adjustment. In this case, transmission of the control pulses in the time of perestroika transceiver path is not performed. In this regard only after perestroika transceiver tract for optimal communication frequency band when changing jamming environment is passing the remainder of the control pulses and the conclusion on the performance of communication systems, although the variant tthe reorganizations≥tmax. Therefore, another disadvantage of the prototype is the lack of a control response time of the elements of the radio channel to form a hindrance and time adjustment of the receiving / transmitting tract for optimal communication frequency band when changing jamming environment. Therefore, the prototype method does not give full information on the performance of the communication system and thereby reduces the reliability of the assessment. In addition, in the case of tthe reorganizations≥tmaxfails the requirement for the timely transmission of information, since the response time is istemi due to the interference exceeds the rated value.

The aim of the invention is to develop a method of diagnosing the state of the communication systems that enhance the reliability of the performance evaluation of communication systems in the frequency-adaptive mode by monitoring the response time of the communication system to be simulated at its input interfering atmosphere and comparison with the desired value.

The analysis of the level of technology has allowed to establish that the analogs are characterized by the sets of characteristics is identical for all features of the claimed method, no. Therefore, the claimed invention meets the condition of patentability "Novelty".

Search results known solutions in this and related areas of technology in order to identify characteristics that match the distinctive features from the prototype features of the claimed invention, have shown that they do not follow explicitly from the prior art. Of certain of applicant's prior art there have been no known impact provided the essential features of the claimed invention to the achievement of the technical result. Therefore, the claimed invention meets the condition of patentability "Inventive step".

Method of diagnosing communication systems operating in the frequency-adaptive mode, which consists in forming a test pseudolus what Inoi sequence of clock pulses and applying it to the input of the transmitting tract, its transformation according to the algorithm of signal conversion, subsequent loosening and mixing with signal noise, switching the input of the receiving channel, the reverse transformation, the selection is transmitted pseudo-random sequence at the output of the reception path, its comparison with the original test by counting distorted pulses, characterized in that it introduced a counting time of perestroika communication system based on the optimal frequency of tthe reorganizationsand comparing this time with the required value.

The implementation of the method is as follows. With early diagnosis in the communication channel is simulated disturbance and measured the time response of the channel to the interference. Further, the communication system is rebuilt on an optimal communication frequency band. Measured time adjustment of the receiving / transmitting tract at the optimum frequency. The efficiency of the communication system is determined by comparing the time of perestroika with the required response time of the system due to interference and quality of completion of the test sequence. At the receiving side is determined by NOshthat compares with valid NSS.

At tthe reorganizations≤tmaxand NOsh≤NSSthe conclusion is made about the health system. Otherwise, the communication system is considered inoperative.

Method of diagnosing communication systems implemented by the diagnosis algorithm presented in the drawing.

Unit 1. The formation of pseudo-random test sequence of clock pulses and applying it to the input of the transmitting tract, converting it according to the algorithm of the signal conversion, the subsequent weakening and mixing with the signal noise [2], the formation of the broadband noise in the transmitting tract with a cut strip, i.e. with the band without interference. Then the control is passed to block 2.

Unit 2. The time dimension of the restructuring communication system for optimal communication frequency. The communication system changes the transmission frequency until you "cut" the band that will be optimal for communication. Then the control is passed to block 3.

Unit 3. The measured time value adjustment is compared with the allowable. The time allowed for the restructuring of the communication system is known from requirements to system requirements. If the measured time value adjustment exceeds the allowable, the control is passed to block 7, otherwise control is passed to block 4.

Unit 4. The reception signal, the error count. There is a selection of the transmitted pseudo-random sequence at the output of the reception path, counting distorted pulses. The control is passed to block 5.

Unit 5. Comparison of the number of the claim is by a pulse with a valid. If the number of errors exceeds acceptable, control is passed to block 8.

Unit 6. The communication system is operable.

Unit 7. Broken system of automatic communication. The control is passed to block 8.

Unit 8. Communication system unusable.

When evaluating the effectiveness of the prototype method the authors use the following formula:

where- reliability of measurement of the error rate;

- the desired value of the error rate;

pOsh- the measured value of the error rate;

ε - width of the confidence interval;

F - function Laplace;

N - number of pulses.

However, in this formula there is no account of time-hopping radio system with the deterioration of the quality of the communication channel. From an analysis of the operation of radio systems in frequency-adaptive modes, it follows that if the link quality (signal/noise ratio at the receiver input) when sending a sequence of N pulses deteriorated, the transmission of this sequence of N pulses is terminated until such time as the radio system will not switch to a new communication channel. At this time, the transmission sequence of N pulses will increase by the time of perestroika radio system (tthe reorganizations):

where M is the number of pulses in the control commands;

Vlane- transmission rate control commands.

Then M is equal to:

Thus, taking into account the time of perestroika radio system reliability of measurement of the error rate should be determined by the following formula:

From this it follows that the formula (1) is a special case of formula (4) at very small values of tthe reorganizations.

Thus, the formula (4) increases the reliability assessment of the technical condition of the communication systems operating in the frequency-adaptive mode.

Sources of information

1. Malyshenko J.V., Cipulis VP, Sharshunov YEAR automation diagnosing electronic devices / edited Vpolicy - M.: Energoatomizdat. 1986. - 216 C.

2. The invention Device diagnostic equipment digital transmission systems": the patent SU 1734219 A1 (51) 5 H 04 3/46, publ. 15.05.92, bull. No. 18.

3. The invention "Method and device diagnostic equipment digital transmission systems: patent RU 2132594 C1 (51) 6 H 04 3/46, publ. 27.06.99, bull. No. 18.

4. Babkov V.Y., Ignatov V.V., cocks A.A. Basics of synthesis of the complexes the radio. Ed. You, SPb.: YOU, 1993, 274 S.

Method of diagnosing communication systems operating in the frequency-adaptive mode is e, consisting in the formation of pseudo-random test sequence of clock pulses and applying it to the input of the transmitting tract, converting it according to the algorithm of signal conversion, subsequent loosening and mixing with signal noise, switching the input of the receiving channel, the reverse transformation, the selection is transmitted pseudo-random sequence at the output of the reception path, its comparison with the original test by counting distorted pulses, characterized in that it introduced a counting time of perestroika communication system based on the optimal frequency of tthe reorganizationsand comparing this time with the desired value and if tthe reorganizations≥tmaxconcludes the integrity of the system of automatic communication, if tthe reorganizations≤tmaxthat is the error count and compared with the allowable number of errors or failure to meet the conditions NOsh≤NSSthe conclusion about the failure of the communication system, otherwise the conclusion is made on the performance of communication systems.



 

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