Device for receiving start-stop messages

 

The invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteoric line of communication with feedback or without feedback channel. Device for receiving start-stop message contains a receiver, a frequency discriminator, the block selection signal and the synchronization clock generator pulses, the deciding unit, the first and second key storage unit, a squarer, drive, strobing the threshold unit and the pulse counter, and the scaling unit. The technical result achieved by the invention is to reduce the likelihood of false positives. 2 Il.

The invention relates to electro - and radio and can be used in wired, radio and meteor scatter communication lines with feedback or without feedback channel.

A device for receiving start-stop messages, L. E. Varakin "communication Systems with noise-like signals", M., and R. S., 1985, pp. 323-325, 281-287.

It contains serially connected receiver, a frequency discriminator, a coherent filter, a threshold device, a differentiating stage, the pulse shaper, the gate device, a scheme of selecting the maximum signal generatore observations moreover, the second input of the Gating device is connected to the output of the matched filter, the control input of the first key is connected to the output of the circuit selecting the maximum signal, the signal input of a casting device connected to the output of the frequency discriminator, the output of the generator of clock pulses connected to the second input of the storage device, and its second input connected to the output of the sensor observation interval connected with a second input circuit selecting the maximum signal and control input of the second key, the output of which is the output of the device (see the same, S. 323-325, 281-287).

Closest to the present invention is a device for receiving start-stop messages on patent 2157053, CL H 04 L 25/38 adopted for the prototype.

The integrated circuit device of the prototype is shown in Fig. 1, showing: 1 - receiver; 2 - frequency discriminator; 3 - block selection signal and synchronization; 4 - clock; 5 - crucial unit; 6, 8, the first and the second key; 7 - storage unit; 9 - squarer; 10 - drive;
11 - strobing threshold block;
12 - pulse counter.

In the block selection signal and synchronization 3 combined filter connected in series, the threshold device diff is PI contains serially connected receiver 1, the frequency discriminator 2, the block selection signal and synchronization 3, connected in series clock 4, the deciding unit 5, the first key 6, the storage unit 7 and the second key 8 whose output is the output device. In addition, it contains a squarer connected in series 9, the drive 10 and strobing threshold unit 11, the output of which is connected with the control input of the second key 8. And the pulse counter 12, the output of which is connected with the second inputs of clock pulses 4 and strobing threshold unit 11, and with the control input of the drive 10. Thus the output of the frequency discriminator 2 is connected to the signal input of the decision making unit 5, the generator Output clock pulses 4 is connected with the second input storage unit 7 and the input of the counter 12.

The first output of the block selection signal and synchronization 3 connected to the first input clock pulses 4 and the controlling input of the first key 6. The second output of the block selection signal and synchronization 3 is connected to a second input of the drive 10. The output of the first key 6 is connected to the input of the Quad 9. The input device is the input of the receiver 1.

The device prototype works as follows.

The received signal,(S=7) with the duration of each element of T, and n - (n=1103information frequency-shift keyed elements of the same duration, after filtering in the receiver 1 and the frequency demodulation unit 2 is fed to the input unit 3, the second output of which is formed by counting the maximum level of the synchronization signal after coherent accumulation, and on the ground a short clock pulse durationcorresponding time this reference (in the absence of interference in the end of the clock). Then the number of counts stored in the memory 10, and the output unit 4 is delayed by an interval of time T relative to the leading edge of the sync pulse generated n short pulses with a period equal to T. in block 5 decisions on the n information symbols and the output signals of one or another polarity are stored in the clocked pulses block 4 block 7.

The same signals after the quadratic transformation Quad 9 sequentially in time are summed voltage in the block 10 and added to the already existing there (voltage reference) with the second output unit 3. If the total signal memory 10 at the end of the last n-th pulse generator 4 exceeds 4.gif">that opens the second key 8, and the output of the generator 4 are n clock pulses, the read information symbols from the storage unit 7 through the key 8 to the output device. This time is determined by the pulse current at the output of the counter 12.

However, this device has a greater chance of false positives.

The invention is directed to reducing the likelihood of false positives.

For this purpose, in the device for receiving start-stop messages containing the serially connected receiver, a frequency discriminator and a block selection signal and synchronization connected in series generator of clock pulses, the deciding unit, the first key storage unit and the second key, the output of which is an output device, connected in series to the squarer, the drive and the gate threshold unit, the output of which is connected with the control input of the second key, and the pulse counter, the output of which is connected with the second input clock pulses and Gating threshold unit and managing input drive and the output of the frequency discriminator connected to the signal input of the decision making unit, the first output of the block selection signal and the led which is connected to the input of a pulse counter and a second input storage unit, entered the scaling block. The scaling unit is connected with the second output of the block selection signal and synchronization, and the output of the scaling unit is connected with the second input of the drive.

In Fig. 2 presents a functional diagram of the proposed device for receiving the start-stop messages, where indicated:
112 is the same as in the prototype;
13 - scaling block.

The proposed device has connected in series receiver 1, a frequency discriminator (BH) 2 and the block selection signal and synchronization 3, connected in series clock (GTI) 4, the deciding unit 5, the first key 6, the storage unit 7 and the second key 8 whose output is the output device. In addition, it contains a squarer connected in series 9, the drive 10 and strobing threshold unit 11, and the pulse counter 12, the output of which is connected with the second inputs of the GTI 4 and strobing threshold unit 11, and with the control input of the drive 10. In addition, the output BH 2 is connected to the signal input of the decision making unit 5, the first output unit 3 is connected to the first input of the GTI 4-managing input of the first key 6, the output of which is connected to the input of the Quad 9.

In the United outinen to the input of the scaling unit 13, the output of which is connected to a second input of the drive 10.

Output strobing threshold unit 11 is connected with the control input of the second key 8.

The receiver input 1 is the input device.

Device for receiving start-stop message is as follows. The received signal consisting of a clock duration Ts, manipulated the frequency of the S-element Barker code (S=7, 9, 11, 13) with the duration of each element of T, and n(n=1103information frequency-shift keyed elements of the same duration, after filtering in the receiver 1 and the frequency demodulation unit 2 is fed to the input unit 3, the second output of which is formed by counting the maximum level of the synchronization signal after coherent accumulation, and on the ground a short clock pulse durationcorresponding time this reference (in the absence of interference in the end of the clock). Then the value of count after amplification (attenuation) in the scaling unit 13 with the transfer coefficient voltage(where U1U2the voltage signal at the output of block 5 and Quad 9, respectively, and

In block 5 decisions on the n information symbols and the output signals of one or another polarity are stored in the clocked pulses GTI 4 unit 7. The same signals after the quadratic transformation Quad 9 sequentially in time are summed voltage in the block 10 and added to the already existing there voltage received from the output unit 13. If the total signal memory 10 at the end of the last n-th pulse GTI 4 exceeds the threshold device 11, the output of the latter is formed by the pulse duration nT+that opens the second key 8, and the output GTI 4 are n clock pulses, the read information symbols from the block 7 through the key 8 to the output device. This time is determined by the pulse current at the output of the counter 12. Thus, the device can reduce the chance of false positives.

That this is indeed so, as you can see from the following. Suppose there are two independent (statistically) a mixture of noise is significantly higher than the effective value of the noise, and the second is significantly lower. Then add to first mixture, the second is almost not change the level of the useful signal in it. The power of noise will increase in two times, which will lead to a reduction ratio at the output of the adder (and poor quality device receiving from us). It is obvious that there is an optimal option of adding mixtures that maximize the ratio at the output of the adder. It is implemented by including in one of the inputs of the adder of the scaling block transfer coefficient K. If K>1, the block 13 is an amplifier. If K<1, block 13 - a voltage divider. Both execution unit 13 are known.


Claims

Device for receiving start-stop messages containing the serially connected receiver, a frequency discriminator and a block selection signal and synchronization connected in series generator of clock pulses, the deciding unit, the first key storage unit and the second key, the output of which is an output device, connected in series to the squarer, the drive and strobing threshold unit, the output of which is connected with the control input of the second key, and the counter impulse and managing input drive, moreover, the output of the frequency discriminator connected to the signal input of the decision making block, the first block selection signal and synchronization connected with the control input of the first key and the first generator input clock pulses, the output of which is connected to the input of a pulse counter and a second input storage unit, characterized in that the input of the scaling unit, the inlet of which is connected with the second output of the block selection signal and synchronization, and the output of the scaling unit is connected with the second input of the drive.

 

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