KR100347251B1 - Switching system and switching method of the remote control transceivers - Google Patents

Abstract

The present invention relates to a circuit switched system and method for a remote control transceiver. The present invention provides a terminal having a slave processor (5) for transmitting circuit connection data including an ASK signal and an ID obtained by synthesizing a PTT control signal and a voice signal to the circuit switch 10 in a serial communication method. 6) and the terminal 6 by the operation of the master processor 7 capable of exchanging line connection data with the terminals 6 and the relay array 9 under the control of the master processor 7. Circuit switch 10 for connecting a line between the transceiver 12 and an ASK decoder which detects a PTT control signal from an ASK signal transmitted from the circuit switch 10 and performs handover switching of the transceiver 12 ( 8) and a transceiver 13 having a low pass filter 11 for inputting the audio signal through the ASK signal to the transceiver 12 and a circuit connecting the output of the transceiver 12 to a line. have. Therefore, according to the circuit switching system and method of the remote control transceiver of the present invention, a plurality of operators can arbitrarily access a plurality of transceivers through a terminal to remotely control the transceiver and perform communication.

Description

Circuit switching system and method of remote control transceiver {SWITCHING SYSTEM AND SWITCHING METHOD OF THE REMOTE CONTROL TRANSCEIVERS}

The present invention relates to a circuit switching system and method of a remote control transceiver, and more particularly, a circuit switching system of a remote control transceiver for remotely controlling a transceiver by connecting a plurality of operators to a plurality of transceivers through a terminal. And to a method.

In general, ship communication is treated as a very important factor because ships sailing with the radio stations on land exchange all information necessary for navigation such as following port, cargo, weather, route, safety and general service. Ship communication, which started with wireless communication by Morse code, has been advanced. Now, with the completion of the Global Maritime Distress Safety System (GMDSS), the most advanced technology of data communication method using satellite is used in ship communication system.

However, most fishing vessels, offshore vessels, coastal patrol boats and small vessels cannot afford to buy expensive satellite communication equipment. none.

Currently, most of the fishing vessels, offshore ships, coastal patrol boats, and small ships use wireless communication such that VHF or SSB, which is a line of sight communication means, is installed in highlands or islands in order to secure a desired range of communication rights. After connecting to the radio station using a solid line or a telephone line, the communication is performed while controlling the transceiver remotely. Here, the remote controller is connected to the operator and the transceiver by a fixed line of 1: 1 to operate by the operation of the PTT (Press-To-Talk) by the remote control.

However, if a one-to-one operation is limited in a wireless station or military communication system that requires random access to multiple transceivers in various departments and must operate communications, it is impossible to expect rapid communication because the communication lines cannot be established as desired by each department. There was this.

In addition, the remote control PTT controller, which transmits DC voltage and current as it is, and detects it and performs remote control, has problems in terms of the quality of communication as well as shortening the life of connecting devices and components on the line by DC. There was a problem that can not be used when passing through the path of the exchange or M / W. In addition, the transmission by the low voltage is attenuated by the line resistance, so it is effective to use the high voltage. Therefore, when the amplifier must be installed in order to amplify the voice signal in the middle, a high voltage repeater must be installed at the same time, there are many difficulties.

As a supplement to these problems, a ton remote controller is commercially available that can be implemented simply and inexpensively without being restricted by use in a telephone line and an exchange.

However, in terms of communication operation, each island's transceiver and land controller are still operated in a fixed ratio of 1: 1, and when a circuit exchange between an operator and a transceiver is required, a separate circuit switch, ICS (aka Integrated Communication System), is used. You must install At present, there is no example of such a circuit switching system localized. Therefore, when a circuit switch is needed in a specific wireless station or a military, all expensive foreign products are imported and used.

In other words, the fixed remote controller operates when the communication is established between the transceiver of each island and the terminal of the land, and the land carrier directly connects (exchanges) the telephone directly to the person involved in the communication through the telephone line. As a result, it is difficult to effectively maintain the speed and accuracy of communication.

Therefore, the current operation by the remote control is operated only at a fixed frequency, so to efficiently handle more traffic, it is necessary to improve the technology and operation method that can make the most of the allocated communication channel.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is a remote control capable of performing a smooth communication by accurately controlling a transceiver, even after a tone signal passes through an exchange according to a user's PTT operation. It is to provide a circuit switching system of the transceiver.

Another object of the present invention is to provide a circuit switching method of a remote control transceiver capable of smoothly performing half duplex while a plurality of operators are connected to an arbitrary transceiver as desired at any position and operating a PTT by remote control. To provide.

1 is a block diagram showing an ASK remote control of the present invention.

2 is a block diagram of a circuit switched system of the present invention.

3 is a diagram showing transmission characteristics for a pass frequency band of a telephone line.

4 is a flowchart showing an algorithm of the circuit switched method of the present invention.

Figure 5 (a) is a protocol diagram for the serial communication between the slave processor for a terminal and the master processor for a circuit switch of the present invention.

Fig. 5 (b) is a flowchart showing the algorithm of the master processor for the exchange of the present invention.

Figure 5 (c) is a flowchart showing the algorithm of the slave processor for a terminal of the present invention.

Explanation of symbols on the main parts of the drawings

1: speaker 2: oscillator

3: amplifier AMP 4: synthesizer

5: SLAVE PROCESSOR 6: Terminal

7: MASTER PROCESSOR 8: ASK Decoder

9: RELAY ARRAY 10: Circuit Switch

11: Low pass filter (LPF) 12: SSB or VHF (transceiver)

13 transceiver unit

In order to achieve the above object, one aspect of the present invention, for transmitting the line connection data including the ASK signal and ID of the synthesized PTT control signal and the voice signal to the circuit switch 10 in a serial communication method The terminal 6 having the slave processor 5 and the master processor 7 capable of transmitting and receiving line connection data with the terminals 6 in a serial communication manner and a relay by the master processor 7 are controlled by the master processor 7. The operation of the array 9 detects a PTT control signal from a circuit switch 10 for connecting a line between the terminal 6 and the transceiver 12, and an ASK signal transmitted from the circuit switch 10 to the transceiver ( 12) and a circuit for connecting the output of the transceiver 12 and the low pass filter 11 for inputting the transceiver 12 to the transceiver 12 by passing only the audio signal through the ASK decoder 8 which performs handwriting switching. One transceiver unit 13 It provides a circuit-switched system of the remote control transceiver formed by box.

In order to achieve the above another object, another aspect of the present invention, the step of checking and transmitting the code of the transceivers in the call (S1 ~ S2), the determination of the interrupt request and the ID identification step of the terminal requesting the interrupt (S3 ~ S4 ), The priority determination step (S5) for determining the priority of the terminal requesting the interruption, and if the priority is low in the priority determination step (S5) after determining the busy of the transceiver requesting the connection with the terminal requesting the interruption; If the connection (S6 ~ S9) and the priority is high, the priority processing step (S6 ~ S11) is made to wait for the next circuit exchange after returning to step S1 unconditionally connecting (S10 ~ S11) the terminal and the transceiver requesting the interrupt An algorithm for a circuit switching method of a remote control transceiver is provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a block diagram showing remote control by ASK of the present invention, and Fig. 2 is a block diagram of a circuit switching system of the present invention.

The terminal 6 is composed of a speaker 1, an oscillator 2 of a control signal, an amplifier 3 of a voice signal, a synthesizer 4, a slave processor 5, and a toggle switch for selecting a transceiver therein. (Not shown), a circuit of an LED (not shown) capable of displaying a transceiver in a call, and a button switch (not shown) for a PTT are added. The circuit switch 10 includes a master processor 7 and a relay array 9, and the transceiver unit 13 includes an ASK decoder 8 and a low pass filter for detecting a PTT control signal in an ASK waveform. And a transceiver 12 of SSB or VHF.

As the PTT control signal is generated in the terminal 6, a voice signal is carried thereon and transmitted to the circuit switch 10 in the ASK method. The ASK waveform transmitted to the transceiver unit 13 via the circuit switch 10 is ASK. The decoder 8 demodulates the PTT control signal to perform handset switching of the transceiver, and the audio signal is input to the transceiver 12 through the low pass filter 11. Here, the ASK modulation method is a kind of FSK modulation method that transmits information by one carrier using on-off keying (OOK), and transmits a frequency when the transmission data is "H", and when it is "L" It is a pause modulation method. This method is simple for comparative modulation and demodulation, and can effectively use transmission band. In case of digital data transmission, it is possible to transmit asynchronous signal, so that remote measurement by using radio waves such as remote starter, wireless modem, home method system of automobile etc. This is the way it is used a lot.

As the ASK signal may receive a demodulation error when a signal of another frequency is received, care should be taken in verifying the data. However, since the present invention uses a wired line, interference against external noise does not need to be significantly considered. That is, the PTT control signal and the voice signal are synthesized through the wired line by the ASK method, and the transmission and switching error due to the change of the ASK signal or the S / N ratio of the voice signal due to the transmission problem should be implemented. Reliability can be maintained.

The PTT control signal used here should be set within the range of 300 ~ 3,400Hz, which is the pass frequency bandwidth of the wireline specified by CCITT. This is the audible signal frequency band, so it should be designed so that the voice signal is not altered by the control frequency. Can perform communication. Therefore, the PTT control signal and the voice signal should be transmitted simultaneously in the ASK method, and the two signal components do not affect each other in transmission at the same time, and the characteristics of stably transmitting the passband range in the wireline should be considered.

In this regard, the results of experimentally analyzing the transmission characteristics with respect to frequency are shown in FIG. As shown in Fig. 3, when the frequency is 2,000 Hz or more, the transmission efficiency begins to decrease, and it can be seen that the above state becomes unstable. In the circuit switching system of the remote control transceiver of the present invention, the switching frequency of the transmission and reception can be reliably performed only when the control frequency for the PTT is transmitted accurately, so that the transmission loss is relatively low, and the interference with the voice signal is the lowest at 2,200 Hz. The sine wave was selected as the frequency of the PTT control signal. That is, in the case of transmission, the 2,200Hz frequency is transmitted by the PTT control signal, and the voice signal is carried along with the ASK method. On the circuit exchanger 10 side, the 2,200Hz is demodulated to carry out the transmission and reception of the transceiver 12. The signal is input to the transceiver 12 through the low pass filter 11.

On the contrary, when receiving, the received information is transmitted to the terminal (operator) through the dedicated line as it is while the transmission switching relay is in a reception state of a normal OFF position.

As the oscillator 2 is suitable for the oscillator 2, the X-tal oscillator is suitable because the control frequency for the PTT should be precise and should not contain other components. The audio signal is configured to be input only when the PTT is keyed and amplified to a level necessary for transmission. The synthesizer of the two signals was constructed by applying the OP AMP IC. The PTT control signal, the voice signal, and the synthesized ASK waveform are expressed as follows.

First, it is assumed that the PTT control frequency is expressed by Equation 1 below.

In addition, it is assumed that the audio signal is expressed by Equation 2 below.

Then, the ASK waveform can be expressed as Equation 3 below.

That is, in Equation 3 above, the PTT control signal should be as small as possible to increase the transmission efficiency of the voice signal. Therefore, in the end, the ASK waveform has a form in which a PTT control signal is combined with a voice signal and transmitted.

The ASK decoder consists of a PLL circuit that is synchronized with an input signal of 2,200Hz. When the ASK decoder is synchronized with a PTT control signal that has passed through a band pass filter (BPF), it outputs a voltage of + 5V. With this voltage, the transceiver of the transceiver is operated on the transmitting side, and the audio signal filtered through the low pass filter 11 is connected to the input of the transceiver with switching.

Next, an algorithm for a line connection for arbitrarily connecting M operators to N transceivers operated by a fixed channel on a fixed channel through the terminal 6 and performing communication will be described with reference to FIG.

First, before describing the algorithm, the integrated environment that the circuit switching system of the remote control transceiver of the present invention should have is as follows.

(1) The operator's terminal displays the transceiver being called on the N transceivers.

(2) It is not possible to connect to a transceiver that is already busy.

(3) In case of calling the base station among N transceivers, all the operators use monitor.

To listen at the same time so you can understand

(4) Reception of a transceiver connected to a terminal is possible only at that terminal.

(5) In case of emergency, multiple transceivers can be used at the same time in one terminal.

You can only send by connecting to,

(6) The terminal is installed within a distance of about 1 km from the line connection controller,

(7) Each terminal uses independent power supply.

Under this integrated environment, the codes of the transceivers in the call are checked (S1), and the codes of the transceivers in the call are transmitted (S2). If it is determined that an interrupt is requested, the process proceeds to the next step if an interrupt is requested, and returns to step S1 if an interrupt is not requested. If the interrupt is requested, after checking the ID of the terminal requesting the interrupt (S4), the priority is determined (S5). If the priority of the terminal requesting the interrupt is determined by determining the priority level, that is, when a normal connection is requested, the code of the transceiver requesting the connection is checked (S6). In this case, it is determined whether the transceiver required to connect is busy (S7), and if the call is busy, transmits an indication that the call is busy to the terminal (S8), and then returns to step S1, and if not, connects the transceiver to the terminal (S9). And return to step S1.

In the priority determining step (S5), if the priority of the terminal requesting the interruption is high, that is, if an urgent connection is required, the code of the transceivers (configurable to be plural) requested for connection is checked (S10). After connecting the terminal and the transceiver (S11), the process returns to step S1.

This algorithm is connected to each other in series communication mode by multiprocessing between the master processor 7 as a controller and the slave processor 5 as a terminal, and the terminal can transfer information by requesting an interrupt to the controller.

The hardware to implement the algorithm can be designed in various ways, but here, the MCS-51 series one-chip processor is used, which is simple in configuration and easy to experiment, and the data transmission between the processors is based on serial communication by RS-232C. Designed. The line connection between the terminal and the transceiver by the control signal uses a relay to allow sufficient current to flow. The protocol for serial communication between processors is configured as shown in FIG. 5 (a). The algorithm of the master processor 7 and the algorithm of the slave processor 5 are as shown in FIGS. 5 (b) and 5 (c). The communication is started by the transmission of the interrupt signal.

Therefore, by using the circuit switching system and method of the remote control transceiver of the present invention, in a communication environment in a ship, a plurality of operators can be connected to any transceiver as desired at any position and precisely control the transceiver by remote control. In addition, since multiple transceivers can be operated, the allocated frequency resources can be utilized more efficiently.

As described above, according to the circuit-switching system and method of the remote control transceiver of the present invention, the circuit-switcher with perfect performance can be localized as a cheaper product. In addition, it can operate in existing telecommunications on land, and can greatly reduce the amount of exchange work, which is the main task of the radio station, thereby reducing the manpower and communication costs.

In addition, it is possible to save foreign currency by replacing expensive foreign products with domestic products, and increase the operability of existing wireless communication equipment, thereby effectively utilizing the limited frequency resources without wasting.

In addition, since the technology can be used for the digitalization of various information provided to fishing vessels currently being promoted by the National Fisheries Cooperative Federation and the direct control between the VTS system's command control headquarters and the monitoring station, the scope of use will be expanded. It is expected.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (4)

In a circuit switching system of a remote control transceiver for remotely controlling the transceiver to allow a plurality of operators to arbitrarily connect to a plurality of transceivers through a terminal, A terminal (6) having a slave processor (5) for transmitting circuit connection data including an ASK signal and an ID combining the PTT control signal and a voice signal to the circuit switch 10 in a serial communication method; The terminal 6 and the transceiver are operated by the master processor 7 capable of exchanging line connection data with the terminals 6 and the relay array 9 under the control of the master processor 7. A circuit switch 10 for connecting lines between the lines 12; And The ASK decoder 8 which detects the PTT control signal from the ASK signal transmitted from the circuit switch 10 and performs the transceiver switching of the transceiver 12, and passes only the audio signal through the ASK signal to the transceiver 12. And a transceiver unit (13) having a low pass filter (11) for discharging and a circuit for connecting the output of the transceiver (12) to a line. 2. The circuit switched system of claim 1, wherein the PTT control signal is a sine wave having a frequency of 2,200 Hz. In the circuit switching method of a remote control transceiver for remotely controlling the transceiver so that a plurality of operators arbitrarily connect to the plurality of transceivers through a terminal, Checking and transmitting codes of transceivers in a call (S1 to S2); Determining an interrupt request and checking an ID of the terminal requesting the interrupt (S3 to S4); A priority determining step (S5) of determining the priority of the terminal requesting the interrupt; And In the priority determination step (S5), if the priority is low, the terminal requesting the interrupt and the transceiver requesting the connection are judged to be busy and then connected (S6 to S9). If the priority is high, the terminal and the transceiver requesting the interrupt are unconditional. After the connection (S10 ~ S11), returning to the step S1 and performs the algorithm consisting of a priority processing step (S6 ~ S11) of waiting for the next circuit exchange. The method of claim 3, wherein if an interrupt is not requested in step S3, the process proceeds to step S1 of checking codes of transceivers in a call. If the transceiver is in call in step S7, a busy signal is transmitted to the terminal (S8). And a step S1, the circuit switching method of the remote control transceiver.