SU1239872A1 - Device for selecting communication channel - Google Patents

Abstract

The invention relates to radio engineering and may be used in adaptive radio links of the KB and VHF bands. The speed of channel selection increases. The device contains a receiver 1, a mixer 2, a filter 3, an interference meter 4, a channel selection block 5, an adder 6, two signal generators (HS) 7 and 8, a frequency tuning unit 9, an element OR 10, a time interval generator (PVI) 11, two counters (C) 12 and .13 and the terminal unit 17. With the arrival at its input of a pulse from the FVI 11, it forms the code of the 1st frequency number. This code through the adder 6 is fed to the input of HS 7. The frequency of HS 7 and that frequency from the spectrum often at the output of receiver 1, which corresponds to the 1st subfrequency, is converted in mixer 2 into the center frequency of filter 3. The results of measurements of interference on each subfrequency and The codes for the numbers of these sub-frequencies come from the interference meter 4 and C 12 into the channel 5 channel selection, which selects the sub-frequency with the minimum interference level and stores the code of this part number until the end of the next measurement cycle. The goal is achieved by the introduction of a mixer 2, filter 3, adder 6, HS 7, 8 and C 12, 13. 3 sludge. i (L S u soco cs IND

Description

. 1

This invention relates to radio engineering and can be used in shortwave adaptive radio links. and ultrashortwave (KB and VHF).

The purpose of the invention is to increase the speed of selection of channels.

Figure 1 shows the structural electrical circuit of the device proposed; figure 2 - receiver; on fig.Z - diagram of the channel selection block.

The communication channel selection device contains a receiver 1, a mixer 2, a filter 3, an interference meter 4, a canape selection unit 5, an adder 6, signal generators 7 and 8, a frequency tuning unit 9, element OR 10, a time interval generator 11, counters 12 and 13, filter 14, demodulator 15, information recorder 16, terminal block 17, input block 18, mixers 19 and 20, amplifiers 21 and 22, automatic tuning block 23, synthesizer 24, multiplexer 25, decoder 26, counter 27, generator 28. pulses, the element And 29, reversible counters 30, the element 31 of the delay element OR 32, reg str.y 33 and 34 and the encoder 35,

The proposed device works as follows.

When initially turned on, receiver 1 tunes to the first operating frequency preset in block 9. Upon completion of the tuning process, receiver 1 outputs a ready signal, which, via element OR 10, starts shaper 11 and returns counter 12 to its initial state. block 9, correspondingly to the branch m n subchittot in the passband of receiver 1, on which information can be received. Counter 12, when a pulse arrives at its input from the former 11, confirms the code of the first frequency number. This code goes to the input of the adder 6, and since nothing is fed to the second input of the adder 6 at that moment, this code from the output of the adder 6 goes to the control of the input of the generator 7.

In this case, the generator 7 issues on; mixer 2 input frequency, which converts to the central frequency, “Ztltra 3, that frequency from the frequency spectrum to the output of receiver 1, which

corresponds to the first sub-frequency. The shaper 11 at each start generates a sequence of n pulses following with a period equal to the measurement time of interference at each sub-frequency. Each pulse coming from the generator 11 is reset to its initial state by meter 4 and recorded 1 into counter 12. The results of measurements of interference on each sub-frequency and the codes of the numbers of these sub-frequencies are transmitted from meter 4 and counter 12 to block 5, respectively. on all n sub-frequencies, block 5 selects the sub-frequency with the minimum level of interference and stores the code of the number of this frequency until the end of the next measurement cycle. In addition, to obtain the results of the measurement of rooms on the / last sub-frequency unit .5 through

the OR 10 unit starts the imaging unit 11 and resets the counter 12, after which the channel selection process with the minimum interference level is repeated. Thus, in block 5 of channel selection, a frequency is prepared that has a minimal level of interference at a given time.

The reception of information by the terminal unit 17 is performed simultaneously with the measurement of interference at the sub-frequencies and the selection of the sub-frequency with the minimum level of interference. In this case, the signal from the output of the intermediate frequency of the receiver 1 through the filter 14 and the demodulator 15 enters the recorder 16. If the quality of the received information is below a certain value, then from the output

the recorder 16, a signal is issued that writes 1 to the counter 13 and allows the issuance of the code of the sub-frequency number from block 5, which has a minimum of interference. The code of the number of the selected frequency arrives at the input of the generator 8. In this case, the generator 8 generates a frequency that enters the receiver's local oscillator, 1, converts the frequency component corresponding to the selected sub-frequency to the intermediate frequency of this receiver 1 ,, equal to the frequency of filter 14. Thereafter, the reception of information is performed at this sub-frequency.

, 0 at the same time, the sub-frequency code, which has the minimum level of interference, is fed to the inverse input of the adder 6, When adding the code of the sub-frequency number, coming from counter 12, with the code

the numbers of the sub-frequency coming from block 5 at the output of the adder 6 will be the difference in the values of these codes, and the frequency of the generator 7 will be reduced by an amount equal to the difference in the values of these sub-frequencies. This is necessary so that when the value of the frequency component changes. The input of receiver 1 converted to the middle frequency of filter 14 keeps the correspondence between the value of the sub-frequency code and the frequency component of the input of receiver 1 converted to the average frequency of filter 3. With each degradation reception quality below a predetermined level, the recorder 16 writes 1 to counter 13 and, from block 5, returns the code of the number of the next sub-frequency that has a minimum of interference to the generator 8 and the adder 6. If within a certain time that is set rmirovatelem It, the number of sub on kotorvgh reception quality below a predetermined level, exceeds a predetermined value, the output from the counter 13 to the input of block 9 receives the signal, by which the receiver unit 1 rearranges the next operating frequency. If during this time the number 1 recorded in counter 13 is insufficient for its overflow, then after a predetermined time has elapsed, this counter 13 is reset by a signal from the other output of the driver 11 and the working frequency does not change. t.

When the control signal from block 9 to the synthesizer 24 changes, the frequency of the signal from block 24 to mixer 19 changes and the code of the signal from block 2–4 to block 23 changes from the output signal which sets up the input unit 18 and the amplifier 21. Upon completion of the specified processes from the output of the unit 23 to the input of the element OR S a signal is received The receiver 1 is ready to receive signals. The other input of the mixer 20 receives a signal from the generator 8 for transferring any frequency of the wideband signal from the output of the amplifier 21 to the center frequency of the amplifier 22.

When the power of the counter 27 is turned on, the reversible counter 30 and the registers 33 and 34 are reset. When entering from the meter

4 to the multiplexer input 25 of the codes of numbers of sub-frequencies it connects the output of the meter 4 alternately to the inputs of the reversible counters 30, where n is the number of analyzed sub-frequencies. At each counter, e 27, pulses are summed, the number of which is proportional to the measured level of interference at the respective sub-frequencies. Upon receipt from the counter 12 to the input of the decoder 26 of the zero code of the sub-frequency number, pulses appear at the output of the decoder 26, which change the state of the counter 27. When accumulating in it a predetermined number P corresponding to the number of reviews of sub-frequencies, the output of the counter 27 enters the signal that triggers the generator 28 and permits the passage of pulses through the element 29 to the subtractive inputs of the reversible counters 30. When any counter reaches 27, it exceeds the maximum possible number of summable pulses from the passage. a zero state, at the output of the check bit of the counter 27 appears 1, which is through the element. The OR 32 records the state of the reversible counters 30 to the register 33. The same signal, via the delay element 31, sets the counter 27 and the reversible counter 30 to the initial state. When the number of errors in the information channel exceeds the allowable value from counter 13 and select block 5, register 34 receives a signal that overwrites register state 33 into this register 34. The signal from the corresponding output of register 34 is converted by the encoder 35 into a code of the sub-frequency number, which the encoder 35 is supplied to the generator 8 and the adder 6.

Claims (1)

Invention Formula A device for selecting a communication channel that contains a serially connected antenna, a receiver, a terminal unit and a channel selection unit, as well as a series-connected OR element, a time interval generator and an interference meter, the output of which is connected to the noise input of a channel selection unit, and a frequency tuning unit, the output of which is connected to the control input of the receiver, the readiness output of which is connected to the first input of the OR element, the second input of which is connected to the output of the channel selection unit, which is At the speed of channel selection, two counters, two signal generators, an adder, a mixer and a filter are entered into it, with the output of the terminal block through the first counter connected to the input of the frequency tuning unit, the second output of the channel selection block through the first generation: trr signals connected to the heterodyne input receiver, and through the series-connected adder, the second signal generator, the mixer and the filter - with the signal input of the noise meter, the second input of the mixer is connected by the input of the terminal unit, the inputs of the second counter are connected respectively to the output of the OR element and the output of the time interval shaper, and the output is connected to the second inputs of the adder and channel selector, the second time ramp output is connected to the first account's input 20 n 22  Fuhg. Z Wi5. 3 Editor A, Sabo Compiled by E.Surina Techred L. Oliynyk Corrector v.But ha Order 3410/57 Circulation 624 Subscription VNIIPI USSR State Committee on matters of inventions and discoveries 113035 ,, Moscow, F-ZZ, Raushsk nab, D. 4/5 Production and printing company, Uzhgorod, Projecto st., 4