KR100288192B1 - Duplication control apparatus for satellite communication modulator - Google Patents

Abstract

PURPOSE: A duplication control apparatus for a satellite communication modulator is provided to perform an efficient switching control by monitoring the operation of an object modulator and the operation state of a duplication control unit and performing an automatic switching. CONSTITUTION: A network operation system(10) controls and monitors an entire satellite communication system. A duplication control unit(20) controls the first and second modulators(30,40) through a data communication with the network operation system(10) control a duplication switching according to a manual command by an external switching operation and the state of each modulator(30,40). The first modulator(30) performs a switching operation according to the switching control of the duplication control unit(20), monitors the state of the second modulator(40) when an error operation is performed in the duplication control unit(20), and automatically perform the switching operation when the second modulator(40) is abnormal. The second modulator(40) performs a switching operation according to the control of the duplication control unit(20), monitors the state of the first modulator(30) when an error operation is performed in the duplication control unit(20), and automatically performs the switching operation when the first modulator(30) is abnormal.

Description

Redundancy Control Device of Modulator for Satellite Communication

In general, a satellite communication means a method of launching a satellite equipped with a repeater having a function of receiving, amplifying, and sweeping the earth for long-distance communication or satellite-to-satellite communication using the satellite.

In the existing satellite communication paging system (PagerSat) using the radio call data transmission earth station system, a modulator for modulating the signal is implemented in a redundant manner to maintain continuity of operation.

In other words, two modulators and one redundancy control board are provided, the active state and standby state are determined by searching the operation states of the two modulators in the redundancy control board, and one side modulator is activated to operate according to the determination. Other condemnations create a standby state.

Then, when an abnormality occurs in the activated modulator, the active modulator is put into the standby state, and at the same time, the modulator that maintains the standby state is activated to continuously perform the modulation operation.

However, this redundancy control method has a problem in that the abnormality occurs in the redundancy control board itself so that the switching control is impossible in case of a malfunction, which causes a serious obstacle to the safety of the system.

Therefore, the present invention has been proposed to solve the above problems of the conventional redundant control apparatus, and an object of the present invention is to provide a separate redundant control apparatus by transmitting and receiving the operation and standby signals by the modulator itself when the redundant control of the satellite communication modulator. It is to provide a duplex control device for a modulator for satellite communication so that the transfer is automatically performed even if an abnormality occurs.

Technical means for achieving this object of the present invention;

A redundancy control unit controlling a modulator through data communication with a network operating system for controlling and monitoring the entire satellite communication system and controlling redundancy switching according to a manual command by an external switch operation and a state of each modulator;

A first modulator for performing a switching operation according to the switching control of the redundancy control unit and monitoring the state of the twenty-first modulator in case of malfunction of the redundancy control unit and automatically performing a switching operation in case of abnormality of the second modulator;

And a second modulator that performs a switching operation according to the switching control of the redundant control unit and monitors the state of the first modulator when the redundancy control unit malfunctions, and automatically performs a switching operation in the event of an abnormality of the first modulator.

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

1 is a block diagram of a redundancy control device for a modulator for satellite communication according to the present invention.

FIG. 2 is a detailed configuration diagram of the modulator of FIG. 1. FIG.

Explanation of symbols on the main parts of the drawings

10: network operating system 20: redundant control unit

30, 40: first and second modulators

1 is a block diagram of a redundancy control device of a modulator for satellite communication according to the present invention.

As shown, the network operating system 10 for controlling and monitoring the entire satellite communication system; A redundancy control unit controlling the first and second modulators 30 and 40 through data communication with the network operating system 10 and controlling redundancy switching according to a manual command by an external switch operation and the state of each modulator ( 20); Perform the transfer operation according to the transfer control of the redundant control unit 20, and monitor the state of the second modulator 40 when the duplication control unit 20 malfunctions to automatically perform the transfer operation in case of abnormality of the second modulator 40. A first modulator 30 to perform; The transfer operation is performed according to the switching control of the redundancy control unit 20, and when the malfunction of the redundancy control unit 20 is malfunctioned, the state of the first modulator 30 is monitored to automatically switch in case of abnormality of the first modulator 30. It consisted of a second modulator 40 to perform.

In the above, since the internal configurations of the first and second modulators 30 and 40 are the same, the internal configuration of the first modulator 30 is as shown in FIG. 2. A modulation enable signal output from the redundancy control unit 20 according to the first inverter 31 for reversing the phase of the redundancy control sub-board alarm signal RCSB-ALM and the output signal of the first inverter 31. A first tri-state buffer 32 for buffering and outputting the ENA-MOD, a second inverter 33 for phase reversing the active receive modulation signal AR-MOD obtained from the other modulator, and the redundancy control sub-board A second inverter 34 for buffering and outputting the output signal of the second inverter 33 according to an alarm signal, and a third inverter for phase reversing the monitoring signal MOD-ALM output from the monitoring controller 36. 37), the output signal of the inverter 37 and the first and Monitoring the state of the modulator and the redundancy control unit by the first and the gate 35 which multiplies the output signal of the second inverter 32, 34 and outputs the result of the modulator monitoring, and the output signal of the first and gate 35 And a supervisory control unit 36 for outputting a supervisory signal corresponding to the supervisory result, and a second and gate 38 for performing an AND operation on the output signal of the third inverter 37 and the output signal of the first end gate 35. ), And the third and gate 39 generating the result of the active signal modulation signal AT-MOD by performing an AND operation on the output signal of the second and gate 38 and the output signal of the second inverter 33. It consists of.

Referring to Figures 1 and 2 attached to the operation of the modulator redundancy control device according to the present invention configured as described above are as follows.

First, the network operating system 10 receives the overall operation state of the modulation unit transmitted from the redundant control unit 20 to perform overall control of network operation, and the redundant control unit 20 performs data with the network operating system 10. Receives a command for control through communication and performs a redundant transfer operation. In addition, the redundancy control unit 20 also controls the redundancy switching operation by a redundancy manual command by a key input.

Here, the redundancy control of the present invention is appropriately implemented according to the situation of each part during one redundancy switching operation performed when the redundancy control unit 20 operates normally and another redundancy switching operation performed when the redundancy control unit 20 malfunctions. In the following, separate descriptions of the above two operating conditions are as follows.

First, the switching operation in the case where the redundancy control unit 20 operates normally, makes the modulation operation of the first modulator 30 active while performing data communication with the network operating system 10 in the redundancy control unit 20, The second modulator 40 is brought into a standby state.

If an abnormality occurs in the first modulator 30 in this state, since the modulation alarm signal (MOD-ALM) signal transitions from the low state to another state, the duplication control unit 20 recognizes the operation of the first modulator 30. Transition is implemented by making the state into the standby state and simultaneously activating the modulation enable signal ENA-MOD of the second modulator 40 in the standby state to operate in the active state.

Similarly, even when an abnormality occurs in the second modulator 40 in the above state, the first modulator 30 becomes active again by performing the switching operation as described above, and the second modulator 40 is in a standby state. Will be converted to.

Table 1-1 below shows the switching state of the two modulators when the redundant control unit 20 operates normally.

Table (1-1) Alternating state during redundancy control

In the above, ① is a low state when switching by an external command not related to the alarm generation of the modulator, and is a high state when switching due to the alarm generation of the modulator in operation.

Next, in the case where a malfunction occurs due to the failure of the redundancy control unit 20, the redundancy switching is performed by the circuit implementation as shown in FIG. 2 in each of the modulators 30 and 40 and the operation state of the redundancy control unit 20. It detects itself and switches automatically.

Here, since the internal configuration of the first modulator 30 and the second modulator 40 and the operation thereof are the same, the accompanying drawings of FIG. 2 are defined as the internal configuration of the first modulator 30 and only the operation thereof will be described.

First, when the redundancy control sub-board alarm signal RCSB-ALM generated by the redundancy control unit 20 and the second modulator 40 is input into the first modulator 30, the first gate 31 controls the redundancy control. The sub-board alarm signal is outputted by inverting the phase, and the first tri-state buffer 32 is controlled by the phase-inverted signal so that the first modulator 30 is output from the redundancy control unit 20 when the operation is controlled. The active signals ENA-MODA are buffered and output.

In addition, the second inverter 33 phase-inverts the active received modulation signal AR-MOD of the counterpart modulator, and the second tri-state buffer 34 performs the second inverter according to the redundancy control sub-board alarm signal. The output signal of (33) is buffered and output.

In this way, the signals output from the first and second tri-state buffers 32 and 34 are summed and input to one input terminal of the first and gate 35. In this case, a third force is input to the type force stage of the second and gate 35. Since the modulator alarm signal through the inverter 37 is input, the second gate 35 logically multiplies the two input signals and transmits the result to the monitoring controller 36 as the other modulator monitoring signal OPER.

Then, the monitoring control unit 36 generates a modulator alarm signal MOD-ALM according to the other modulator monitoring signal, and the generated modulator alarm signal is inverted in phase in the third inverter 37 and then the second and gate In operation 38, the other modulator monitoring signal output from the first and second gates 35 is logically multiplied with the other active receiving modulation signal, which is an output signal of the second inverter 33 and output from the third and third gates 39 and 39, respectively. It is logically multiplied by AR-MOD and transmitted to the state modulator as an AT-MOD active transmission modulated signal (AT-MOD) for redundancy switching.

In other words, when the alarm signal of the redundancy control unit 20 is input, and a malfunction is detected by the modulator in operation, the modulator in operation immediately changes to the standby state, and the active transmission modulated signal (AT-MOD) signal is shown in the following table (1-2). As shown in the figure, the transition from high to low is performed, and the active receiving modulated signal AR-MOD of the other modulator goes to a low state and becomes an active state to start an operation. The transmission modulated signal (AT-MOD) is in a high state and complete switching is automatically performed.

Table (1-2) below shows the redundancy switching due to an error of the modulator in operation when an alarm occurs in the redundancy control unit 20.

Table (1-2) Automatic switching state in case of redundancy control unit malfunction

As described in detail above, the present invention provides a malfunction of the redundant control unit by performing automatic switching by monitoring each other's operation of the other side's modulator and the operation state of the redundancy control unit when the modulator switching control of the radio call data base station communication system is performed. Accurate changeover control is possible even at the time, and thus there is an effect of implementing efficient transfer control.

In addition, the above effects have an effect of improving the safety and reliability of the system.

An object of the present invention is to provide a duplication control device for a satellite communication modulator so that automatic switching is performed even when an error occurs in a separate duplex control device by transmitting and receiving an operation and standby signal by the modulator itself during duplication control of a modulator for satellite communication.

Claims (2)

A modulator redundancy control apparatus in a radio call data base station communication system, Controls the first and second modulators 30 and 40 through data communication with the network operating system 10 that controls and monitors the entire satellite communication system, and is redundant according to the manual command by the external switch operation and the state of each modulator. A redundancy control unit 20 for controlling the switching; Perform the transfer operation according to the transfer control of the redundant control unit 20, and monitor the state of the second modulator 40 when the duplication control unit 20 malfunctions to automatically perform the transfer operation in case of abnormality of the second modulator 40. A first modulator 30 to perform; The transfer operation is performed according to the switching control of the redundancy control unit 20, and when the malfunction of the redundancy control unit 20 is malfunctioned, the state of the first modulator 30 is monitored to automatically switch in case of abnormality of the first modulator 30. Redundancy control device of the modulator for satellite communication, characterized in that consisting of a second modulator (40) to perform. The method according to claim 1, wherein the first and second modulators 30, 40, The redundancy control unit 20 according to the first inverter 31 which phase-inverts the redundancy control sub-board alarm signals RCSB-ALM output from the redundancy control unit 20 and the output signal of the first inverter 31. The first tri-state buffer 32 buffering and outputting the modulated enable signal ENA-MOD output from the output signal, and the second inverter 33 for inverting the phase of the active receive modulated signal AR-MOD obtained from the other modulator. And a second inverter 34 for buffering and outputting an output signal of the second inverter 33 according to the redundancy control sub-board alarm signal, and a monitoring signal MOD-ALM output from the monitoring control unit 36. A third inverter 37 for inverting the phase and a first and gate for outputting the output signal of the inverter 37 and the output signals of the first and second inverters 32 and 34 as a modulator monitoring result. 35 and an output signal of the first and gate 35. A supervisory control unit 36 for monitoring the state of the modulator and the redundant control unit and outputting a supervisory signal corresponding to the supervisory result; Logically multiplies the second and gate 38, the output signal of the second and gate 38 and the output signal of the second inverter 33, and generates a result as an active transmission modulated signal (AT-MOD). The redundancy control device of the modulator for satellite communication, characterized in that each consisting of a third and gate (39).

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