Method of temporarily adapt to deliberate sighting frequency interference and device for its implementation

 

(57) Abstract:

The invention relates to the field of radio and may find application in devices analysis jamming environment for systems of protection against interference. The proposed method solves the problem of detecting intentional, sighting frequency interference and time adapting to it with a view to its elimination. Produced by the sensor test 1 signal is converted and transmitted over the communication channel 3. Newly converted in unit 4, the signal enters the device allocation error 5, which is compared with a reference test, coming from the sensor 7. The error signal is recorded by the counting device 6, and the results of the determination of the coefficients of the error stored in the storage device 8. Simultaneously with the counting of errors in the units of analysis error grouping 9 accumulate information about grouping of errors in accordance with the number of analyzed frequency. Then analyze the overall pattern of error distribution unit 10 and the microcomputer 11 makes the conclusion about the presence of impact noise in case of revealing patterns of grouping errors towards the end of the package and the recommended duration of the package. 2 S. p. f-crystals, 6 ill.

The invention relates to the field of radio and movie methods frequency adaptation are sensing allocated to the radio frequency test sequences by evaluating the error probability for each frequency and subsequent selection for radio frequencies with minimal probability of error. Such methods are described (for example, U.S. patent N 4328581, ed. St. USSR N 1667265, 1107304, 1188897). Most fully General approach to the problem of frequency adaptation described (Komarovich C. F. and Piglets Century. N. Random interference and reliability KV connection. -M.: Communication, 1977, S. 92-127).

However, all these methods do not answer the question about the nature of the existing noise and very close characterize the degree of suitability of the channel in terms of grouping errors.

Closest to the present invention is a method (Shuvalov VP Reception of signals with the assessment of their quality. -M.: Communication, 1979, S. 168).

This method consists in the fact that

transmit a known test sequence (test);

compare on the receiving end passed the test with a reference sequence;

consider the number of errors (mismatches);

repeat this procedure on a dedicated radio frequencies;

remember the determination results TOOshin accordance with the numbers of frequencies.

If this

< / BR>
- evaluation of the probability of error;

Yi= I if there are errors;

Yi= 0 correct reception.

This assessment is consistent, unbiased and has variance

< / BR>
Bostonview interference.

To implement this method can be used in the device shown in Fig. 1, showing: 1 - sensor test; 2 - device conversion signal; 3 - channel; 4 - device conversion signal receiver; 5 - device selection errors; 6 - counting device; 7 - sensor test; 8 - storage device.

Sensor test 1 produces a probing test sequence, which enters the channel 3 through the signal conversion 2 (the modulator). At the output of the channel 3 signal is demodulated in block 4, and is then compared in the device allocation error 5 with the reference test produced by the sensor test 7. Counting unit 6 registers the number of errors (mismatches), and in the storage device 8 are fixed number of frequencies and the corresponding values of the error rate. Are used for the communication frequency with minimal TOOsh.

< / BR>
where nOsh- the number of erroneous items;

nlane- the number of sent items (test length).

The disadvantage of this method is the lack of information about the nature of the interference, lack of information about grouping errors in transmission test for multiple selected communication frequency interference and time adapting to it with a view to its elimination.

The method is based on the assumption that the real Director sighting frequency interference takes some time to detect the signal. A possible situation is shown in Fig. 2,

where is the detection time of the communication channel analyzer the jammer;

Tn- time adjustment to a different frequency;

Tnlthe time of transmission/reception in a communication channel plus Tn.

In this case, the system state is described by a system of equations

< / BR>
Pwiththe signal strength;

PW- power random noise;

Pp- power interference.

Is physically represents the ratio of the energy of the useful signal is spent for the transmission of messages to the part of the energy of the jammer, which is spent on suppression signal. Research derived1(Tnland2(Tnlshows that the function1(Tnl) increases and is curved upward on the interval [0, + Tn] and2(Tnl) curves downward. Determining the value of the function (Tnl), in which she has no points rasuwa 1-St kind, we get Tnl= Tn+ . Graphically the results of the above reflection is shown in Fig. 3. This schedule is confirmed is anushika interference, suppression of no. This effect is based proposed method of temporary adaptation to the sighting frequency interference.

The proposed method consists in the following:

transmit a known test sequence (test);

compare on the receiving end passed the test with a reference sequence;

consider the number of errors (mismatches);

analyze grouping (location) error on the length of the test;

repeat this procedure on a dedicated radio frequencies;

remember TOOshin accordance with the numbers of frequencies;

analyze the repeatability of the location of the error on the length of the test when probing different frequencies,

analyze the overall pattern of grouping errors;

make a conclusion about the presence of impact frequency interference and on the recommended duration of the data packet transmitted on the same frequency, equal to the length of the unaffected part of the package if the errors are grouped by the end of the package of the probe sequence in the analysis of different frequencies.

For the implementation of the proposed method is shown in Fig. 4, where indicated: 1, 7 - sensors test; 2, 4 - device conversion signal;analysis grouping errors; 10 - analysis of the General regularities of distribution of the errors; 11 - personalised.

The device has connected in series sensor test 1, unit conversion signal (the modulator) 2, channel 3, device conversion signal receiver (demodulator) 4, device allocation error 5, a second input connected to the output of the sensor test 7, the counting device 6, the storage device 8.

The output device selection error 5 is connected with the input device grouping analysis error 9, the outputs of which are connected to the inputs of an analysis device of the General regularities of distribution of errors 10, the output of which is connected to the input of the microcomputer 11.

Sensor test 1 produces a probing test, which through the conversion of signal 2 is supplied to the communication channel 3. Of the communication channel 3 through the signal conversion receiver 4, the signal enters the device error detection 5, where the element is compared with a reference test from the sensor 7. The error signal (mismatch) is recorded by the counting device 6, the results of determination of the coefficients of the error stored in the storage device 8 in accordance with the numbers of frequencies. Simultaneously with pods with the number of analyzed frequency. Then analyze the overall pattern of error distribution unit 10, and the microcomputer 11 makes the conclusion about the presence of impact noise in case of revealing patterns of grouping errors towards the end of the package and the recommended duration of the package. Option execution units 5, 9, 10 for processing 3-x test length 4 bits is shown in Fig. 5.

As device selection error 5 the chip is used LP, as units of analysis error grouping 9 (registers error) D2D3D4registers are used OR, as the analysis device of the General law of error 10 (D5-D8) is the majority element LP.

The operation of the device illustrated plots, shown in Fig. 6.

Used in communication systems modes software adjustment of the operating frequency (frequency hopping) with different lengths of packets (different time of transmission/reception on the same frequency) is well proven in terms of intentional interference, as resizewindow such a system is much higher than conventional systems.

1. Method of temporarily adapt to deliberate sighting frequency interference, which consists in transmitting a known test consistent sequences with the reference sequence, the error counting and memorizing the error rate in accordance with the number of the sensed frequency, wherein remember the placement of the error on the length of the known test sequences taken at each frequency, compare the placement of the errors on N known test sequences taken at the N probing frequencies, determine the appropriate length of the data packet based on the length of the unaffected parts of the known test sequences.

2. Device for temporary adaptation to intentional target obstacle, containing connected in series sensor test sequence, a modulator, channel, demodulator, block compare, counter, storage unit, and the second input unit of comparison is connected to the output of the sensor reference sequence, wherein the output unit of comparison is connected to the N inputs of record blocks and placement errors, the outputs of which are connected with inputs of the unit of analysis of the General regularities of distribution of the errors.

 

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