RU2271609C1 - Method for diagnosing communication system - Google Patents

Abstract

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.

1 cl, 1 dwg

Description

The proposed technical solution relates to the field of radio engineering, namely to the field of monitoring the technical condition of communication systems operating in frequency-adaptive modes.

Known diagnostic methods are described, for example, in the book: Automation of Diagnostics of Electronic Devices / Yu.V. Malyshenko, V.P. Chipulis, S.G. Sharshunov / Ed. V.P. Chipulisa - M .: Energoatomizdat. 1986.- 216 p. [1], including the formation of a test sequence, its conversion according to the established law, storing the converted sequence and comparing it with the previously calculated. Differences in converted and calculated sequences indicate a failure or malfunction. The known method implemented in the device for diagnosing the state of the equipment of digital transmission systems according to the USSR author’s certificate No. 1734219, stated on 6.08.90, published on 05.15.92, bulletin: N 18 [2], which, in addition to the above, is highlighted in a pseudo-random sequence after each transformation, calculating the mathematical expectation of the number of unit characters, the variance of the number of occurrence of unit characters and the probability of occurrence of single characters, and determining the parameters of possible technical parameters from the results obtained its state of the equipment of digital transmission systems. However, the known methods do not provide sufficient reliability of the diagnosis due to the limitation of the measurement time.

The closest in technical essence to the proposed technical solution is the method implemented in the device for diagnosing the state of the equipment of digital transmission systems according to the copyright certificate of the Russian Federation No. 2132594, filed January 5, 1998, published June 27, 1999, bulletin No. 18 [3]. The prototype method consists in generating a test pseudo-random sequence of 158400 clock pulses and feeding it to the input of the transmitting path, converting it according to the established signal conversion algorithm, then attenuating and mixing it with the noise signal, switching to the input of the receiving path, reversing it, and isolating the transmitted pseudorandom the sequence at the output of the receiving path, its comparison with the original test by counting distorted pulses. According to a predetermined algorithm, if the permissible value of distorted pulses is exceeded, N _Оsh > N _add , where N _Ош is the number of distorted pulses, N _add is the allowable number of distorted pulses, the test pseudorandom sequence is retransmitted, and new ones can be introduced and (or) excluded previously set conversion pseudo-random sequence depending on the ratio of N to N _{oui add,} as long as there is no defective block apparatus defined digital transmission systems.

The disadvantage of the prototype is that the process of tuning the adaptive communication system to the optimal frequency band for communication is considered instantaneous, although this requires a certain tuning time (t _perest ≤t _max = 10-60 s) [4] (p. 22, p. 95 , p. 98), where t _max is the maximum permissible adjustment time. In this case, the transmission of control pulses at the time of the reconstruction of the transceiver path is not performed. In this regard, only after the transceiver path is tuned to the optimal frequency band for communication, when the noise environment changes, the remaining control pulses are passed and the communication system is operable, although the option is t _overrun ≥t _max . Therefore, another disadvantage of the prototype is the lack of the ability to control the response time of the elements of the radio communication channel to the generated interference and the time of tuning the transceiver path to the optimal frequency band for communication when the interference environment changes. Therefore, the prototype method does not provide complete information about the health of the communication system and thereby reduces the reliability of the assessment of its condition. In addition, in the case of t _oversteps ≥t _max , the requirement for the timely transmission of information is not fulfilled, since the response time of the communication system to the generated interference exceeds normalized values.

The aim of the invention is to develop a method for diagnosing the state of communication systems, which provides an increase in the reliability of assessing the health of communication systems in the frequency-adaptive mode by monitoring the response time of the communication system to a jamming environment simulated at its input and comparing it with the required value.

The analysis of the prior art allowed to establish that analogues, characterized by sets of features that are identical to all the features of the claimed method, are absent. Therefore, the claimed invention meets the condition of patentability "Novelty."

Search results for known solutions in this and related fields of technology in order to identify features that match the distinctive features of the claimed invention from the prototypes have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the provided by the essential features of the claimed invention on the achievement of the specified technical result is not known. Therefore, the claimed invention meets the condition of patentability "Inventive step".

A method for diagnosing a communication system operating in a frequency-adaptive mode, which consists in generating a test pseudo-random sequence of clock pulses and applying it to the input of the transmitting path, converting it according to the established signal conversion algorithm, then attenuating and mixing it with the noise signal, switching to the input of the receiving path, its inverse transformation, allocation of the transmitted pseudo-random sequence at the output of the receive path, its comparison with the original test by calculating the claim ennyh pulses, characterized in that it entered count time adjustment system for optimal communication frequency t _rearrange and comparing this time with a desired value.

The implementation of the method is as follows. With the start of diagnostics in the communication channel, interference is simulated and the response time of the channel to interference is measured. Further, the communication system is tuned to the optimal frequency band for communication. The time taken to tune the transceiver path to the optimum frequency is measured. The operability of the communication system is determined by comparing the adjustment time with the required response time of the communication system to the generated interference and the quality of the test sequence. At the receiving side is determined _oui N, which is compared with the permissible N _ext.

When t _rearrange ≤t _max and N _oui ≤N _additional concludes system performance. Otherwise, the communication system is considered inoperative.

A method for diagnosing communication systems is implemented by the diagnostic algorithm shown in the drawing.

Block 1. Formation of a test pseudo-random sequence of clock pulses and its supply to the input of the transmitting path, its conversion according to the established signal conversion algorithm, subsequent attenuation and mixing with the noise signal [2], the formation of broadband interference in the transmitting path with a “cut out” band, that is with a strip without interference. Next, control is transferred to block 2.

Block 2. Measurement of the tuning time of the communication system to the optimum frequency for communication. The communication system changes the transmission frequency until it tunes to the “cut out” band, which will be optimal for communication. Next, control is transferred to block 3.

Block 3. The measured value of the tuning time is compared with the acceptable. The permissible time for restructuring a communication system is known from the requirements for the system. If the measured value of the tuning time exceeds the permissible, control is transferred to block 7, otherwise control is transferred to block 4.

Block 4. Reception of a signal, counting errors. The transmitted pseudorandom sequence is extracted at the output of the receiving path, counting distorted pulses. Control is transferred to block 5.

Block 5. Comparison of the number of distorted pulses with a valid. If the number of errors exceeds the permissible, control is transferred to block 8.

Block 6. The communication system is operational.

Block 7. Inoperative automatic communication system. Control is transferred to block 8.

Block 8. Communication systems are inoperative.

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

- достоверность измерения коэффициента ошибок;Where

- the reliability of measuring the error rate;

- требуемое значение коэффициента ошибок;

- the required value of the error rate;

r _osh - the measured value of the error coefficient;

ε is the value of the confidence interval;

Ф - Laplace function;

N is the number of pulses.

However, this formula does not take into account the time of adjustment of the radio communication system with a deterioration in the quality of the communication channel. From the analysis of the operation of radio communication systems in frequency-adaptive modes, it follows that if the quality of the communication channel (signal-to-noise ratio at the input of the receiver) deteriorates when transmitting a sequence of N pulses, then the transmission of this sequence of N pulses ceases until the radio communication system is rebuilt to a new communication channel. In this case, the transmission time of the pulse train N will increase by the time of adjustment of the radio communication system (t _perest ):

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

V _per - the speed of transmission of control commands.

Then M is equal to:

Thus, taking into account the time of adjustment of the radio communication system, the reliability of measuring the error coefficient should be determined by the following formula:

From this it follows that formula (1) is a special case of formula (4) for very small values of t _perestroika .

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

Information sources

1. Malyshenko Yu.V., Chipulis V.P., Sharshunov S.G. Automation of Diagnostics of Electronic Devices / Ed. V.P. Chipulisa - M .: Energoatomizdat. 1986.- 216 p.

2. The invention "Device for diagnosing the state of the equipment of digital transmission systems": patent SU 1734219 A1, (51) 5 N 04 V 3/46, publ. 05/15/92, bull. Number 18.

3. The invention "Method and device for diagnosing the state of the equipment of digital transmission systems": patent RU 2132594 C1, (51) 6 N 04 B 3/46, publ. 06/27/99, bull. Number 18.

4. Babkov V.Yu., Ignatov V.V., Petukhov A.A. Fundamentals of the synthesis of radio communication complexes. / Ed. V.V. Ignatova, St. Petersburg: YOU, 1993, 274 p.

Claims (1)

A method for diagnosing a communication system operating in a frequency-adaptive mode, which consists in generating a test pseudo-random sequence of clock pulses and applying it to the input of the transmitting path, converting it according to the established signal conversion algorithm, then attenuating and mixing it with the noise signal, switching to the input of the receiving path, its inverse transformation, allocation of the transmitted pseudo-random sequence at the output of the receive path, its comparison with the original test by calculating the claim ennyh pulses, characterized in that it entered time count adjustment system for optimal communication frequency t _rearrange and comparing this time with a desired value and if t _rearrange ≥t _max, concludes inoperability automatically conducting a communication system, if t _rearrange ≤t _max, count error occurs and the comparison with the permissible number of errors and non-compliance with the conditions N _oui ≤N _additional concludes inoperability communication system, otherwise it is concluded communications system performance.