SU1347191A1 - Simplex radio communication system - Google Patents

Abstract

The invention relates to radio and reduces the frequency band while maintaining high noise immunity. At each fixed station (CC) 3,4 and 5, the received call signal is assigned by the receiver 12 of the call signal. At the end of the call signal, the CC 3 emits a carrier frequency (woofer) modulated by an r.j marker signal of 1500 Hz. CC 4 through 200 He (emits low-frequency modulated G 1600 Hz. CC 5 emits low-frequency modulated G 1700 Hz through 400 Mc. For this, the signal from receiver I2 through delay line 13 and electr OR 14 starts shaper 15 time interval, k- The ry 16 starts the marker signal and switches the transmitter 6 into the transmission mode. Other mobile radio stations (LDCs) though receive signals from the CC, but the formation of the marker signal and the inclusion of the transmit (L - Рig.1.

Description

1347191

Chika 31 is not produced, since Previously, to establish a connection between the RPS by the received call signal, these RPS 17, which sent the call signal, and the CC4. are blocked for a time sufficient for 2 Il.

one.

The invention relates to radio communications and may be used for communication between a train dispatcher and train locomotive drivers in railway transport,

The aim of the invention is to reduce the frequency band while maintaining high noise immunity.

Figure 1 shows the structural electrical circuit of the proposed system; Fig. 2 shows plots specifically for the operation of the system.

The simplex radio communication system comprises a central station 1, a communication line 2, fixed stations 3 - 5, each of which consists of a transmitter b, a signal receiver 7, a radio signal receiver 8, a marker signal receiver 9, a switch 10, a control signal generator 11, a call receiver 12, a delay line 13, an OR element 14, a time interval generator 15, a marker signal generator 16, and also mobile stations 17, each consisting of delay lines 18 and 19, a radio signal receiver 20, a call signal receiver 21, a receiver 22 of a marker signal, a signal analyzer 23, a signal frequency selection block 24, a marker signal generator 25, OR elements 26-28, a call signal generator 29, a bar element 30, a transmitter 31 of a time interval generator 32, and a control block 33

The simplex radio system operates as follows.

In the initial state, the stationary radio stations 3-5 are disconnected from the communication line 2. The establishment of a connection between the central station 1 and the mobile station 17 may be

exist both at the initiative of the central station 1J and at the initiative of the mobile station 17,

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To establish a connection initiated by the mobile station 17, the call button is pressed in the control unit 33, the signal from the output of which starts the delay line 18, and through the OR element 27 switches the transmitter 31 on to transfer and starts the call signal generator 29. The latter forms a call signal, which through the OR 26 element is fed to the modulation input of the transmitter 31 (Fig. 2a), modulating its frequency.

The call signal is received by the receivers 8 of the radio signal of three stationary radio stations 2 - 5 located in the coverage area of the mobile station 17,

At each fixed station 3–5, the control signal generator 11 generates a corresponding control signal to which predetermined frequencies of the generator 16 of the marker signal correspond, the frequency of the receiver 9 of the marker signal and the time delay of the delay line 13. Each three adjacent stationary radio stations must be distinguished by the generator and receiver frequencies of the marker signals and the time delay to turn on the transmitter to emit the marker signal. For example, at the stationary station 3, the control signal generator 11 generates a control signal such that the generator 16 of the marker signal is configured to generate a frequency Fj 1500 Hzr and the receiver 9 of the marker signal receives the frequency 1 1500 Hz and the delay line 13 forms a zero time delay t ®, At fixed station 4, the control signal shaper 11 generates such a control signal that the generator 16 of the marker signal is tuned to generate a frequency F 1600 Hz, the receiver 9 of the marker

31

the signal is received at a frequency Fi of 1600 Hz, and the delay line 13 forms a time delay t, 200 Me At a stationary station 5, the control driver 1 generates such a control signal that the generator 6 of the marker signal is configured to form the frequency G - 1700 Hz, the receiver 9 marker signal - to receive the frequency Fj - 1700 Hz, and the delay line 13 generates a time delay t 400 M For subsequent stationary radio stations, the generator and receiver frequency of the marker signals and the time delay are repeated for every third stationary radio station ntsii. At each fixed station 3-5, the received call signal is assigned by receiver 12 of the call signal. At the end of the call signal, the stationary station 3 emits a carrier frequency modulated by a marker signal i 1500 Hz (FIG. 2b) 5 the stationary station 4 t 200 Me emits a carrier frequency modulated by a marker signal F 1600 Hz (fcg.2 in), and stationary station 5 through t 400 Me is the carrier frequency modulated by the marker signal Jy 1700 Hz (FIG. 2d, Dp of this signal from the output of receiver 12 of the call signal through delay line 13 and the OR 14 element starts the driver 15 turn starts generator 16 marker signal and turns on the transmitter 6 in the transmission mode.

The output signal from the generator 16 of the marker signal is fed to the mod l c; the ion input of the transmitter 6, modulating its carrier frequency. The signals from the fixed stations are received by the receiver 20 of the mobile station 7, and then the received signals are sequentially analyzed by the analysis of the signals 23. For this, the signals from the output of the receiver 20 are fed to the input of the receivers 22 of the marker signal, which sequentially form at their first output the signals corresponding to the received marker signals. During these signals, the signal analyzer 23 evaluates the signal arriving at its first input from the output of the radio signal receiver 20. Voltages, Proprietary

The level of the input signals of the receiver 20 comes from the output of the analyzer 23 to the input of the unit 24, where they are compared, then the highest voltage is determined. The moment of comparison is determined by the pin generated at the additional output of the receivers 22 of the marker signal at the end of each marker signal. For example, the highest voltage, which responds to the best quality of the aircraft, will be fixed from the stationary station 4, which is closest to the mobile station 17, while the marker signal generator 25 is tuned to generate a frequency f 1600 Hz. Then at the end of the reception of all marker signals, the signal from the output of the delay line 18 through the element OR 28 starts the time interval generator 32, which in turn starts the generator 25 of the marker signal, and through the element OR 27 switches the transmitter 31 into transmission mode. The generator 25 generates a marker signal F 1600 Hz, which through the element OR 26 is fed to the modulation input of the transmitter 31 (fig.2d) -, modulating its carrier frequency. Until the end of reception of all marker signals, signals. the first output of the receivers 22 of the marker signal does not pass to the output of the inhibiting element 30, since the inhibitory potential from the output of the delay line 18 is applied to the first input of the inhibiting element 30 (Fig. 2e). Other mobile radios cannot interfere with the establishment of a connection, since each of them, using the call signal receiver 21, sets the inhibit potential at the third input of the barring element during the connection and the delay line 19. Thus, although other mobile radios receive signals from stationary radio stations, the formation of a marker signal and the inclusion of transmitter 31 do not occur, because with a previously received call signal these mobile radio stations are blocked for a time sufficient to establish a connection between mobile station 17 station that sent the call signal and fixed station 4.

I347i

A carrier modulated with a marker signal F 1600 Hz is received at fixed station 4 by receiver 8 and transmitted by receiver 9 of marker signal: a which causes trigger switch 10. As a result, low-frequency output of receiver 8 is connected via switch 10 to link 2 (FIG. . 2g). The fixed stations 3 and 5 are not connected to the link 2, as they do not capture the marker signal assigned to them. Thus, communication between the mobile station 17 and the central station 1 is established only through one fixed station 4, which provides the best communication quality and high immunity to interference.

During a communication session, the mobile station 17 moves relative to the fixed stations 3 - 5, as a result of which the conditions of the connection between the mobile 17 and the fixed 4 stations change. In order to maintain high noise immunity, each time a transmission from the mobile station 17 is completed, a new station station selection is selected, providing the best communication quality and high noise immunity. In this case, the exchange of marker signals between the mobile 17 and stationary 3-5 stations is similar to that indicated, and Each time, the switch 10 returns to its initial state by a signal from the output of receiver 12, which is fed to the input of the switch 10. At the end of the radio session from the central Tanzi 1-hook signal is sent which is received by the receiver 7-hook signal and a commutator 10 is driven to its original state, I

Communication between the central station 1 and the mobile station 17 is initiated by the central station 1 via a call signal transmitted by the central station 1 via the LINK line 2 (FIG. 2h). The call signal is received, for example, at a fixed station 4 by a signal receiver 7, which, through the OR 14 element, starts the time generator 15, which in turn starts the

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The raster 16 of the marker signal transfers the transmitter 6 to the transmission mode and transmits the carrier modulated by the marker signal G 1600 Hz {fig.2i).

This signal at the mobile station 17 is received by the receiver 20. At the same time, the receivers 22 of the marker signal are triggered, which, through the inhibit element 30 and the OR 28 element, trigger the time interval generator 32, and also turn on the signal frequency selection unit 24, which adjusts the marker generator 25 to the frequency of the marker signal F 1600 Hz, the Shaper 32 of the time interval through the element OR 27 switches the transmitter 31 to the transmission mode, turns on the generator 25, the marker signal F 1600 Hz, from the output of which through the element OR 26 enters to the modulating input of the transmitter 31 and further to the radio channel (FIG. 2k).

The marker signal F 1600 Hz is received at the fixed station 4 by the receiver 8. This triggers the receiver 9 of the marker signal and the switch 10, which connects the output of receiver 8 to the line 2 of communication (Fig. 2m). Disconnection of stationary station 4 from line 2 of communication is performed by the pick-up signal transmitted via line 2 of communication by central station 1 (FIG. 2L) and received at stationary station 4 by receiver 7. In this case switch 10 disconnects receiver output 8 from line 2 connection.

Claims (1)

Invention Formula A simplex radio communication system comprising a central station connected by a communication line to fixed stations, each of which contains a transmitter and a radio signal receiver connected in series, a marker signal receiver and a switch, the output of which is connected to the communication line, and the control input of the marker signal receiver connected to the output of the control signal generator, and the antenna input of the radio signal receiver and output the transmitter is connected to the antenna, as well as mobile stations, each of which contains a radio signal receiver connected in series, a signal analyzer, a selection unit 71 frequency signal, marker signal generator 5 the first OR element and transmitter output of which is combined with the antenna input of the radio signal receiver and connected to the antenna, the information output of the radio signal receiver connected to the input of the receiver of the call signal and the input of the receiver of the marker signal whose output is connected to the second input signal frequency selection unit, as well as a control unit, the output of which is connected to the second input of the first element OR via the signal generator, in order to reduce frequency bands while maintaining high noise immunity, sequentially connected receiver of signals, element OR, time interval generator and marker generator are inputted to the stationary station, the output of the second one is connected to the modulation input of the transmitter, the control input of which is connected to the output of the timeformer interval and with the control input of the radio signal receiver, the output of which is connected to the second input of the switch and through the serially connected call signal and delay line ki is connected to the second input of the OR element, and the output Challenge of the private transfer of PO.SVO {Staiiii Gyyad °., "II7TI ,, one V U S Call from the Central and ctrtaMUV flaf 9 the receiver of the call signal is connected to the first control input of the switch, the second control input of which is connected to the control output of the receiver of the output signal, whose input is connected to the communication line, and the output of the control signal generator is connected to the generator input of the marker signal and the adjustment input delay lines, the first delay line, the inhibit element, the second OR element, the time interval generator and the third OR element, which is connected to the control input, are entered at the mobile station transmitter and receiver data input RF signal, wherein the additional You are a. the receiver of the marker signal is connected to the second input of the signal analyzer and the second input of the prohibition element, the first input of which is connected to the second input of the second IPD element, and the third input to the output of the first delay line J whose input is connected to the output of the call signal receiver, the output of the control unit is connected to the input of the second delay line and the second input of the third OR element, while the output of the time interval generator is connected to the control input of the marker signal generator. U