Device for receiving start-stop messages

 

The device can be used in wired, radio, radio-relay and meteor scatter communication lines. It contains connected in series receiver, the first band-pass filter, the first amplitude detector, subtractive device, a breaker, a coherent filter, solver, the first driver pulse generator SRP and the inverter with appropriate links, connected in series, a second bandpass filter, the second amplitude detector with corresponding connections, connected in series, the first delay line, the first key, the first demodulator MDF signal circuit OR the shift register and the third key, serial connected second delay line, the second key and the second demodulator MDF signals with corresponding connections, connected in series adder, the third amplitude detector, the integrating device, a threshold device and the second shaper pulses, a binary counter with corresponding connections. Technical result achieved in implementing the inventive device is to reduce the probability of false alarms. 2 Il.

The invention relates to electro - and radio and can be used in Provody, containing the serially connected receiver, a band-pass filter, peak detector, subtractive device, a breaker, a coherent filter, solver, the pulse shaper and the second solver, connected in series, a second band-pass filter, whose input is connected to the output of the receiver, and the second amplitude detector connected to the output of the second subtractive input device, the output of subtractive device connected to the second input of the second casting device, the third, fourth and fifth inputs of which are connected respectively to the output of the matched filter, the second output of the pulse shaper and the output of the first deciding device, moreover, the second output of the pulse shaper is connected to a second output of circuit breaker [1].

However, this device for receiving start-stop message has low immunity and high probability of false alarm.

Closest to the claimed device is a device for receiving start-stop messages [2]. Its functional scheme is shown in Fig.1.

It contains serially connected receiver 14, the first band-pass filter 15, the first amplitude detector 16, subtractive device sluchainyh sequences (SRP) and the inverter 23, connected in series to the second band-pass filter 24, the inlet of which is connected to the output of the receiver 14, and the second amplitude detector 25, the output of which is connected to the second input of subtractive device 17, connected in series, the first delay line 26, the first key 27, the first demodulator 28 fathersname-modulated (MDF) signals and circuit 29, OR, and consistently connected to the second delay line 30, the second key 31 and the second demodulator 32 MDF signals, the output of which is connected to the second input of the circuit 29, OR, moreover, the inputs of the first 26 and second 30 delay lines connected respectively to the outputs of the second 24 and the first 15 of bandpass filters, the output of a casting device 20 is connected to the second input of the generator 22 of the SRP, the output of which is connected to the control inputs of the first key 27 and the first demodulator 28 MDF signals, the output of the inverter 23 is connected to control inputs of the second key 31 and the second demodulator 32 MDF signals, clock inputs of the blocks 28 and 32 are connected to the output of the shaper 21 pulses, the second output of which is connected to a second input of circuit breaker 18.

However, this device for receiving start-stop message has a high probability of false alarms.

The invention is aimed at reducing) the United receiver 14, the first band-pass filter 15, the first amplitude detector 16, subtractive device 17, the switch 18, a coherent filter 19, a crucial device 20, the imaging unit 21 of the pulse generator 22 of the SRP and the inverter 23, connected in series, a second band-pass filter 24, the inlet of which is connected to the output of the receiver 14, and the second amplitude detector 25, the output of which is connected to the second input of subtractive device 17, connected in series, the first delay line 26, the first key 27, the first demodulator 28 MDF signals and circuit 29, OR, and consistently connected to the second delay line 30, the second key 31 and the second demodulator 32 MDF signals, the output of which is connected to the second input of the circuit 29, OR, with the inputs of the first 26 and second 30 delay lines connected respectively to the outputs of the second 24 and the first 15 of bandpass filters, the output of a casting device 20 is connected to the second input of the generator 22 of the SRP, the output of which is connected to the control inputs of the first key 27 and the first demodulator 28 MDF signals, the output of the inverter 23 is connected to control inputs of the second key 31 and the second demodulator 32 MDF signals, clock inputs of the blocks 28 and 32 are connected to the first output of the shaper 21 pulses, the second output of which is connected to the second inputs of which are connected respectively to the output of the circuit 29 OR to the first output of the first imaging unit 21 of the pulses and the third key, connected in series adder, the third amplitude detector, an integrating device, a threshold device and a second pulse shaper, and the first and second inputs of the adder connected to the outputs of the second 31 and the first 27 keys, respectively, the second input of the integrating device connected to the output of a casting device 20, and the output of the second pulse shaper is connected to a second input of the third key, and a binary counter, the input and the output of which is connected respectively to the output of the first imaging unit 21 of pulses and a second input of the threshold device.

In Fig.2 presents a functional diagram of the proposed device for receiving the start-stop messages.

Device for receiving start-stop message contains serially connected receiver 1, the first band-pass filter 2, the first amplitude detector 3, subtractive device 4, the circuit breaker 5, a coherent filter 6, a crucial device 7, the first imaging unit 8 pulse generator 9 SRP and the inverter 10, connected in series, a second band-pass filter 11, the inlet of which is connected to the output of the receiver 1, the second amplitude detector 12, the output of which is connected to the second input of subtractive device 4, posledovatel the shift 17 and the third key 18, connected in series to the second delay line 19, the second key 20 and the second demodulator 21 MDF signals, the output of which is connected to the second input circuit 16 OR the first inputs 13 and 19 second delay lines are connected respectively to the outputs of the second 11 and the first 2 bandpass filters, the output of a casting device 7 is connected to the second input of the generator 9 of the SRP, the output of which is connected to the control inputs of the first key 14 and the first demodulator 15 MDF signals, the output of the inverter 10 is connected to control inputs of the second key 20 and the second demodulator 21 MDF signals, clock inputs of the blocks 15 and 21 connected to the first output of the first driver 8 pulses, the second output of which is connected to the second input of the circuit breaker 5, the second input of the shift register 17 is connected to the first output of the first driver 8 pulses, connected in series adder 22, the third amplitude detector 23, the integrating device 24, a threshold device 25 and the second shaper 26 pulses, and first and second inputs of the adder 22 is connected to the outputs of the second 20 and the first 14 keys, respectively, the second input of the integrating device 24 is connected to the output of a casting device 7, the output of the second shaper 26 pulses with the Ohm driver 8 pulses and a second input of the threshold device 25.

The start-stop device message is as follows. The received signal after filtering in the receiver 1 is supplied to a frequency discriminator consisting of blocks 2-4, 11, 12, which generates at its output a bipolar signal, the elements of which in the absence of noise exactly match the characters "0" and "1" of the SRP, is formed on the transmission side. After matched filtering in the filter 6 at the output of the latter at the end of the SRP signal is formed of a high level, and in the final device 7 in an optimal way is determined by the time position of its maximum, and at this time the output is formed by a short pulse. With regard to him in the first shaper 8 pulses at the first output delay time T are 2n+2 (n>m, where n and m the length of the message and SRP, respectively) short clock pulses and the pulse duration (n+2)T prohibiting through the circuit breaker 5, the signal on the next block. Blocks 13-16, 19-21, designed for demodulation of the symbols of the message transmitted on two carrier frequencies. The first signal carrier frequency after a delay time equal to ST, the block 19 is provided by a key 20, which is about what PR is the demodulation of signals with phase difference of the manipulation on this frequency. Similarly (units 13-15) is the demodulation of the signal at the second carrier frequency. Obtained at the outputs of blocks 15 and 21 characters are combined into a single message in scheme 16 OR recorded pulses of the first imaging unit 8 in register 17. In block 22, the filtered and delayed signals of the two parts are combined into one, which is then detected in the block 23. In the integrator 24, is set to zero by a pulse of a casting device 7, is the accumulation of all n elements of the signal. The obtained result is compared with a threshold in block 25 in the moment of action short pulse pulse counter 27 with the conversion factor n+2. If the signal exceeds the threshold, the second imaging unit 26 produces a pulse of duration nT, which opens the third key 18 and the information read from the shift register pulse shaper 8, the output of the third key 18, which is the output device.

This is a method of reducing the likelihood of false alarms. All blocks included in the device for receiving start-stop messages are well-known devices. Various schemes phase difference demodulators shown, for example, in the book by A. M. Sesetan digital demodulator there, discussed in article L. J. Lipkin and A. A. Shishkov ("Electrosvyaz", 1973, No. 2, S. 47-51).

Sources of information

1. Volobuev, B. and others About the noise immunity start-stop communication system with frequency shift keying signal. Theory and technique of radio communications, vol.2, 1998.

2. RF patent 2177209, CL H 04 L 25/00.

Claims

Device for receiving start-stop messages containing the serially connected receiver, the first band-pass filter, the first amplitude detector, subtractive device, a breaker, a coherent filter, solver, shaper pulse generator SRP and inverter, connected in series, a second band-pass filter, whose input is connected to the output of the receiver, and the second amplitude detector, the output of which is connected to the second input of subtractive device, connected in series, the first delay line, the first key, the first demodulator MDF signals and the scheme OR, and consistently connected to the second delay line, the second key and the second demodulator MDF signals, the output of which is connected to the second input schema OR the inputs of the first and second delay lines are connected respectively to the outputs of the second and the first bandpass filter, the output of the am of the first key and the first demodulator MDF signals, the inverter output is connected to control inputs of the second key and the second demodulator MDF signals, clock inputs of the first and second demodulators MDF signals connected to the first output of the pulse shaper, the second output of which is connected to the second input of the circuit breaker, characterized in that it additionally connected in series to the shift register, the first and second inputs which are connected respectively to the output of the circuit OR to the first output of the first pulse shaper, and a third key, serial connected to the adder, the third amplitude detector, an integrating device, a threshold device and a second pulse shaper, moreover, the first and second inputs of the adder connected to the outputs of the second and first keys, respectively, the second input of the integrating device connected to the output of a casting device, and the output of the second pulse shaper is connected to a second input of the third key, and a binary counter, the input and the output of which is connected respectively to the output of the first pulse shaper and the second input of the threshold device.

 

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