SU1005139A1 - Device for transmitting and receiving discrete information - Google Patents

Description

The invention relates to control and management systems in which messages are transmitted by complete codes with an active pause, and can be used in telemechanics systems for communication with mobile objects, particularly in the mining quarry, if the control center of technological objects is to be moved out of the seismic zone. career in which explosions are made.

A device for receiving and transmitting information is known, comprising a high-frequency generator, a filter unit, an antenna, a threshold receiver, a gating unit, a signal shaper, a General reset, a frequency divider unit, a plausibility checker, triggers, a shift register, a pulse shaper, and NAND elements, decoding unit, processing unit and matching element 1.

However, such a device does not allow the exchange of information in the pit's technological transport control system, where the control device (for example, a CCM) must be installed outside the earthquake-prone zone where explosions are made.

It is also known to receive and transmit information containing route code generators, a switch, a control unit and a radio station 2.

The disadvantage of this device is the low reliability of receiving information from moving volumes under conditions of interference.

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Closest to the invention is a device for transmitting receiving discrete signals, comprising a generator, the output of which is connected to the first input of the modulator, to the second input

15 which is connected to the output of the first valve; the modulator output through the transmitter is connected to the first input of the first key, the output of the second key through the serially connected receiver

20 and the discriminator is connected to the input of the amplifier, the first output of which is connected to the input of the peak detector, the second output is connected to the first input of the second valve, the output of which 25 is integrated with the output of the first valve and connected to the communication line; inverters and pulse formers, one vibrators, the input of the first one-vibration is connected to the output of the peak detector, and the output of the first one-vibration through the first inverter is connected to the input of the second one-vibration, the first of which is output through the second inverter and. key, the second output of the second one-shot is connected to the second inputs of the first valve and key 3. The disadvantage of this device is the low reliability of receiving information when exposed to impulse noise. So, if the receiver of this device receives a pulse interference from the radio channel, then after a time determined by the parameters of the first one-shot, the device switches to the transmission mode and will remain in this state for the time specified by the parameter of the second one-shot. Therefore, a message arriving at a time interval noted for a time, or not at all, if the device has already been switched on for transmission, i.e. the second one-shot worked, or it would not be received with distortions from its loss, its part. The purpose of the invention is to increase the availability of information. To achieve this goal in a device for transmitting and receiving discrete information containing a first-key, whose information input is connected to a communication line, the output of the first key is connected via a modulator to an information input. the transmitter, whose output is connected to the information input of the second key, the output of the second key is connected to the radio channel and the information input of the third key, the output of which is connected to the information input of the receiver, the output of the receiver is connected to the information input of the fourth key, the output of which is connected to the line connection, the first driver of the control pulses whose output is connected via an inverter to the control inputs of the transmitter and the first and second keys and directly to the control inputs of the receiver and the third and fourth keys, the pulse selector is entered, the second control pulse generator, the counter, the delay element and elements And, the output of the detector through the pulse selector is connected to the inputs of the first element And whose output is connected to the information input of the counter and the input of the second driver control pulse the output of which is connected to the control input of the second element AND and through the delay element with the counter reset input, the output of the counter is connected to the information input of the second element AND whose output from one with the input of the first driver control pulse. An increase in the reliability of reception in the device is achieved by extracting information pulses from the received signals and interfering with the help of a selector of code signs and forming one of them using the first element AND of a synchronizing sequence of pulses; due to the simultaneous control of the number of pulses in the message and the duration of pauses between them. The simultaneity of the existence of these two factors of reliable reception is checked by the second element I. The counting of the number of pulses in a message and c) checking them with a given number is carried out by a counter. The duration of the pauses between adjacent information pulses is controlled by a second driver (a waiting multivibrator with a restart). .In FIG. 1 is a structural block diagram of the proposed device; in fig. 2 - oscillograms of signals at some points of the device: a) signals of logical units at the first output of the selector; b) signals of logical zeros at the second output of the selector; c) signals at the output of the first element And; d) signals at the output of the second driver control pulses (standby multivibrator with a restart); d) the signal at the output of the delay element; e) the signal at the output of the counter; g) the signal at the output of the second element I; h) a signal at the output of the first driver of control pulses. A device for transmitting and receiving discrete information comprises a communication line 1, a first key 2, a modulator 3, a transmitter 4 ,. second key 5, radio communication channel b, third key 7, receiver 8, detector 9, code feature selector 10, fourth key 11, first element 12, counter 13, second control driver 14, second element 15, element 16 delay, the first driver 17 upg avlzshchik pulses, the inverter 18. The device operates as follows. In the initial state, the device is in a sleep mode; the radio channel 6 through the public key 7 is connected to the information input of the receiver 8, which is in the on state. The radio signals from the mobile objects passing through the radio area are received and transmitted through the key 7 to the input of the receiver 8 and detected by the detector 9. The detected signals are a pulse sequence consisting of a given number of elementary information pulses constituting the message in the case of undistorted reception. The detected pulses through the open key in the initial state 11 are transmitted to the communication line 1, as well as to the selector 10 of code features. The number of outputs of the selector 10 is equal to the base used for the radio code. FIG. 1 and FIG. 2 illustrates the operation of the device when using binary codes; in this case, the selector 10 has two outputs, at the first output signals of logical units (Fig. 2a) appear, and on the second, logical zeros (Fig. 26). Using element 12, the number of inputs of which is equal to the number of selector 10 code signs, the pulses that are informational to them are combined (Fig. 2c) and fed to the input of shaper 14 (waiting for multivibrator 14. with repeated start). The parameters of the waiting multivibrator 14 with restarting are chosen so that its residence time in the active CONDITION: after acting on its input a single pulse several (1.5-2 times) exceeds the duration of the pause between the information pulses of the message. In this case, when receiving a message, the pending multivibrator 14 with restarting is in the active state during the whole time of receiving radio signals; at the same time, a low potential impulse occurs at its output, the duration of which by the time constant of the multivibrator 14 exceeds the duration of the message (Fig. 2d). Through the element 16 of the delay of a given pulse front, this signal is fed to the reset input of the counter 13 (Fig. 2e). and allows the counting of pulses / signals passing to its information input from element I 12. After receiving the last message pulse (Fig. 2c) (Fig. 2c, time tp) at a time determined by the parameters of the waiting multivibrator 14 with restart, its output appears high potential (Fig. 2d, time t) affecting the first input of the element 15 and entering through the delayed edge element 16 to the reset input of the counter 13 (fig. 2e, time t2) / as a result which account mode is prohibited, and c. counter 13 is written zero. The second input element And 15 affects the signal from the output of the counter 13-. Positive potential at the output of the counter 13 appears only in the case of recording in the counter 13 numbers equal to the specified number of pulses in the message (Fig. 2e). With the simultaneous appearance of a high potential, a positive impulse appears at both inputs of the AND 15 at its output (Fig. 2g, moment t), which triggers the driver 17 (one-shot). The parameters of the element 16 of the delay of the falling edge of the pulses are selected on the basis of the required duration of the trigger pulse at the input of the one-shot 17, which ensures its reliable start. After the one-shot 17 is triggered, a HIGH potential appears at its output (Fig. 2h), turning off the receiver 8 and closing key 7 and key 11, with the result that radio channel 6 is disconnected from the input of receiver 8. and line 1 is from detector 9 At the same time, the transmitter 4 turns on the transmitter 4 and opens the key 2 and the key 5, as a result of which the link 1 is connected to the input of the modulator 3, to the radio channel 6 to the output of the transmitter 4; Thus, information from link 1 is transmitted via modulator 3, transmitter 4, key 5 and radio channel 6 to mobile objects. The duration of the stay of the one-shot 17 in the active LHOM state is equal to the time required for preparing the response and for transmitting it. After the operation of the one-shot 17, the keys 2 and 5 are closed, the transmitter 4 is turned on, the radio channel b is connected via the key 7 to the input of the receiver 8, and the communication line 1 through the key 11 to the detector 9; receiver 8 is turned on, i.e. the device returns to receive mode. Transition of the device from the reception mode of the transmission is possible only if a pulse sequence is received with a strictly specified number of pulses in the message and with given time characteristics, ticks: the length of the pause between any adjacent pulses should not exceed the residence time of the standby multivibrator 14 s restart. If interference is received in the form of a single pulse (time tjHa of Fig. 2) or in the form of a pulse sequence with the number of pulses less than the specified one, then with its end counter 13 will be reset before its high potential occurs. If the pulse sequence satisfies the specified requirements for the duration of pauses between adjacent pulses, but contains the number of pulses greater than the specified one, then the device will also not switch to the transmission mode, since in this case the simultaneous appearance of a high potential at the first and second turns is impossible. element and 15.

The use of this device in control systems of mobile objects allows to increase the reliability of information exchange between technological objects and the control center, which is connected with the proposed cable line and can therefore be located outside the area of radio communication with mobile objects (for example, in the case of automated process control systems). quarries The control center must be moved outside the earthquake-prone zone where blasting operations take place.

Claims (3)

1. USSR author's certificate number 732960, cl. G 08 C 19/28, 1980. 2. Devices and control systems,. 1975, 4, p. 9, fig. one. 3. USSR author's certificate number 574743, cl. G 08 C 19/12, 1976 (prototype).