Intersatellite optical amplifier control system coping with abnormal reset of CPU (Central Processing Unit) and control method thereof

Abstract

The invention provides an inter-satellite optical amplifier control system for coping with abnormal reset of a CPU and a control method of the inter-satellite optical amplifier control system, and relates to the technical field of optical amplifiers for satellite laser communication. The control system comprises an optical amplifier internal control part and an optical amplifier upper computer control part; the optical amplifier internal control part comprises a control CPU module, a reset circuit module, an external DAC module, a pumping drive circuit module and a communication module, the reset circuit module and the external DAC module are respectively in communication connection with the control CPU module, and the control CPU module is connected with the optical amplifier upper computer control part through the communication module. And the external DAC module is electrically connected with the pumping driving circuit module. On the basis, the effect that after the control CPU module is abnormally reset, the driving current of the pump laser cannot be out of control is achieved, and then the problem that the laser communication service is interrupted due to the fact that an existing inter-satellite optical amplifier is affected by the space radiation environment and the control CPU is abnormally reset is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of optical amplifiers for satellite laser communication, in particular to an intersatellite optical amplifier control system for coping with CPU abnormal reset and a control method thereof. BACKGROUND

[0002] At present, intersatellite laser communication, as a core technology for constructing a space-ground integrated network, is promoting the rapid development of satellite Internet. As an important component of the intersatellite laser communication payload, the optical amplifier is mainly used for realizing power amplification of the transmitted optical signal and low-noise and high-sensitivity amplification of the received weak optical signal. For example, in the transceiving optical path design and terminal device of low-speed intersatellite laser communication provided in the Chinese patent with the publication number CN115085806A, an optical amplifier is used to amplify infrared laser.

[0003] However, the current intersatellite optical amplifier is facing severe challenges brought by the space radiation environment in actual application. In particular, the space radiation single particle effect is easy to cause the control CPU of the intersatellite optical amplifier to abnormally reset, and then cause the interruption of laser communication services. Specifically, the space radiation single particle effect refers to that a single space high-energy charged particle hits the sensitive part of a microelectronic device, and due to the ionization effect, the microelectronic device generates extra charge or causes material atomic displacement, and then the logic state of the microelectronic device changes, and the function is disturbed or fails. For the control CPU of the intersatellite optical amplifier, when affected by the space radiation single particle effect, abnormal running phenomenon occurs, the program running inside will have errors or stop running, and then the watchdog timer inside or the external reset circuit is triggered, and finally the control CPU is forced to reset. This abnormal reset will cause the control of the optical amplifier to be interrupted or fail, and then the pump laser driver current is out of control, and finally the laser communication link is interrupted.

[0004] In view of the above, the application provides an intersatellite optical amplifier control system for coping with CPU abnormal reset and a control method thereof. SUMMARY

[0005] The application aims to provide an intersatellite optical amplifier control system for coping with CPU abnormal reset and a control method thereof, so as to solve the problem that the existing intersatellite optical amplifier is affected by the space radiation environment and abnormally resets the control CPU, and then causes the interruption of laser communication services.

[0006] The application is implemented by adopting the following technical scheme:

[0007] The application discloses an intersatellite optical amplifier control system for coping with CPU abnormal reset, which comprises an optical amplifier internal control part and an optical amplifier host computer control part.

[0008] Further, the optical amplifier internal control part further comprises a hardware protection circuit module, and the hardware protection circuit module is electrically connected with the pump driving circuit module.

[0009] Further, the reset circuit module comprises an external watchdog circuit, and a reset output end of the external watchdog circuit is connected with the control CPU module.

[0010] Further, the external DAC module comprises a DAC chip, and the DAC chip is configured to output a default voltage of 0V after a power supply is established; after the control CPU module configures a DAC output voltage to the DAC chip, the DAC chip maintains the DAC output voltage until a new control instruction from the control CPU module is received or power supply is powered off.

[0011] Further, the pump driving circuit module comprises a hardware constant current source circuit, and the hardware constant current source circuit changes an operating current provided to a pump laser based on a DAC output voltage of the external DAC module.

[0012] Further, the communication module comprises a communication circuit, and the optical amplifier host computer control part acquires operating state information of the optical amplifier and controls laser output of the optical amplifier through the communication circuit.

[0013] Further, the hardware protection circuit module comprises a hardware comparator circuit, and the hardware comparator circuit outputs a pump closing signal to the pump driving circuit module without intervention of the control CPU module when the optical amplifier has no input light, current exceeds a threshold value or temperature exceeds a threshold value.

[0014] The control CPU module of the optical amplifier control system is mainly a control software carrier of the optical amplifier, which is prone to running errors or running stops due to space radiation single particle effects or other factors, and then is reset and restarted under the action of the reset circuit module. Based on this, in order to avoid the abnormal reset of the control CPU module causing the loss of control of the pump laser driving current, an external DAC module, a communication module and an optical amplifier host computer control part are arranged, and the external DAC module is specifically arranged to be independent of the control CPU module. The control CPU module needs to configure the output voltage of the external DAC module based on the control of the optical amplifier host computer control part. Unless a new control instruction is received or the power supply is powered off, the external DAC module will maintain the previously received output voltage. Therefore, when the control CPU module is abnormally reset, it cannot directly control the external DAC to be closed or controlled in other ways without the optical amplifier host computer control part sending a control instruction again, so as to affect the work of the pump driving circuit module, so that the laser output of the pump laser will not be interrupted, thereby not causing adverse effects on the laser communication link. In addition, the hardware protection circuit module can enter the working state after the optical amplifier is powered on. Whether the control CPU module is normally running or not, the hardware protection circuit module can realize pump (pump laser) protection when the optical amplifier is abnormally running.

[0015] A control method of an inter-satellite optical amplifier control system for coping with CPU abnormal reset, applying the inter-satellite optical amplifier control system for coping with CPU abnormal reset described above, comprising the following steps:

[0016] Step S1: the optical amplifier power supply is turned on, and each module is initialized;

[0017] The default output voltage of the external DAC module is 0V, so that the running current provided by the pump driving circuit module to the pump laser is 0A. The control CPU module communicates with the optical amplifier host computer control part in real time through the communication module;

[0018] Step S2: the pump driving circuit module provides a running current to the pump laser, so that the pump laser outputs laser;

[0019] After the control CPU module receives the laser output control instruction from the optical amplifier host computer control part, it configures the corresponding DAC output voltage to the external DAC module, and the pump driving circuit module provides the corresponding running current to the pump laser based on the DAC output voltage;

[0020] Step S3: after the control CPU module has a running error or stops running, the reset circuit module sends a reset signal to the control CPU module to reset and restart it;

[0021] Wherein, the control CPU module will not automatically issue new control instructions to the external DAC module after reset and restart, so the external DAC module maintains the DAC output voltage configured to it before the control CPU module reset and restart;

[0022] Step S4: the light amplifier host computer control part re-controls the laser output of the light amplifier;

[0023] Wherein, the control CPU module will not automatically issue new control instructions to the external DAC module after reset and restart, so the external DAC module maintains the DAC output voltage configured to it before the control CPU module reset and restart;

[0024] Further, in the process of the steps S1 to S4, the hardware protection circuit module monitors the state of the light amplifier in real time and protects; when the light amplifier has no input light, the current exceeds the threshold or the temperature exceeds the threshold, the hardware protection circuit outputs a pump closing signal to the pump driving circuit module.

[0025] Further, in the step S4, the light amplifier host computer control part reissues the original laser output control instructions before the reset and restart of the control CPU module or sends new laser output control instructions.

[0026] The beneficial effects realized by the present application are:

[0027] The present application provides an intersatellite light amplifier control system and control method for coping with CPU abnormal reset, by setting a light amplifier host computer control part, a control CPU module, a reset circuit module, an external DAC module, a pump driving circuit module and a communication module, and setting steps S1 to S4, when the control CPU module abnormally resets, the external DAC module will maintain the output voltage before the reset, and then the pump laser driving current will not be out of control. Based on this, compared with the prior art that abnormal reset will cause the light amplifier control to be interrupted or invalid, the present application will not cause the interruption of laser communication link, and can realize the normal performance of intersatellite laser communication. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structure composition block diagram of the control system described in the embodiment of the present application;

[0029] Figure 2 is the flowchart of the control method described in the embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0031] Embodiment 1

[0032] The first aspect of the embodiment provides an intersatellite optical amplifier control system for coping with CPU abnormal reset, please refer to Figure 1 , which comprises an optical amplifier internal control part and an optical amplifier host computer control part. The optical amplifier internal control part comprises a control CPU module, a reset circuit module, an external DAC module, a pump driving circuit module, a hardware protection circuit module and a communication module. The reset circuit module and the external DAC module are in communication connection with the control CPU module. The control CPU module is connected with the optical amplifier host computer control part through the communication module. The external DAC module is electrically connected with the pump driving circuit module. The hardware protection circuit module is electrically connected with the pump driving circuit module. Specifically,

[0033] The control CPU module is mainly a software carrier of the optical amplifier, which is internally provided with a running RAM and a program storage Flash. The reset circuit module mainly comprises an external watchdog circuit, and the reset output end of the external watchdog circuit is connected with the control CPU module. The communication module mainly comprises a communication circuit. The optical amplifier host computer control part obtains the running telemetry state information of the optical amplifier and controls the laser output power of the optical amplifier through the communication circuit.

[0034] The external DAC module mainly comprises a DAC chip, which is connected with the control CPU module through an SPI bus. The DAC chip is configured as follows: after the power supply is established, the DAC chip outputs a default voltage of 0V; after the control CPU module configures a DAC output voltage for the DAC chip, the DAC chip maintains the DAC output voltage until a new control instruction from the control CPU module is received or the power supply is powered off.

[0035] The pump driving circuit module comprises a hardware constant current source circuit. The hardware constant current source circuit changes the running current provided to the pump laser based on the DAC output voltage of the external DAC module, so as to change the size of the output optical power of the pump laser. The hardware protection circuit module mainly comprises a hardware comparator circuit. The hardware comparator circuit can perform a protection operation when the optical amplifier appears an abnormal condition without the control CPU module being connected.

[0036] The second aspect of the embodiment provides a control method of an intersatellite optical amplifier control system for coping with CPU abnormal reset, which applies the above-described intersatellite optical amplifier control system for coping with CPU abnormal reset, please refer to Figure 2 , which comprises the following steps:

[0037] Step S1: the power supply of the optical amplifier is turned on, and each module is initialized.

[0038] The default output voltage of the external DAC module is 0V after power-on, so that the running current provided by the pump driving circuit module to the pump laser is 0A, and at this time, each pump laser is in the off state; the control CPU module communicates with the optical amplifier host computer control part in real time through the communication module, so that the optical amplifier host computer control part can obtain the running state information of the optical amplifier and control the laser output of the optical amplifier.

[0039] Step S2: The pump driving circuit module provides a running current to the pump laser, so that the pump laser outputs laser;

[0040] The control CPU module receives the laser output control instruction from the optical amplifier host computer control part, and configures the corresponding DAC output voltage to the external DAC module through the SPI bus, so that the pump driving circuit module provides the corresponding running current to the pump laser based on the DAC output voltage, so that the pump laser outputs laser, and the inter-satellite laser communication service proceeds normally.

[0041] Step S3: After the control CPU module is affected by the space radiation single event effect or other factors and an error occurs or stops running, the reset circuit module sends a reset signal to the control CPU module to reset and restart it;

[0042] After the control CPU module is reset and restarted, it does not automatically issue a shutdown instruction or other new control instruction to the external DAC module, so the external DAC module maintains the DAC output voltage configured to it before the control CPU module is reset and restarted, and the pump driving circuit module works normally, so the laser output of the pump laser is not interrupted, and the inter-satellite laser communication service still proceeds normally.

[0043] Step S4: The optical amplifier host computer control part re-controls the laser output of the optical amplifier;

[0044] After the control CPU module is reset and restarted, the control CPU module sends the control CPU module reset and restart information to the optical amplifier host computer control part through the communication module, and then the optical amplifier host computer control part sends the original laser output control instruction before the reset and restart or a new laser output control instruction to the control CPU module according to the requirement.

[0045] In the process of the above steps S1 to S4, the hardware protection circuit module monitors the state of the optical amplifier in real time and performs protection; when the optical amplifier appears abnormal conditions such as no input light, current threshold value or temperature threshold value, the hardware protection circuit can output a pump shutdown signal to the pump driving circuit module without the intervention of the control CPU module.

[0046] To sum up, the inter-satellite optical amplifier control system and the control method thereof provided in the embodiment can realize that the external DAC module maintains the output voltage before the reset when the control CPU module is abnormally reset, and further make the pump laser driving current not out of control, by setting the optical amplifier host computer control part, the control CPU module, the reset circuit module, the external DAC module, the pump driving circuit module and the communication module, and setting steps S1 to S4.

[0047] It should be particularly pointed out that the parts not described in detail or expanded in the above-mentioned scheme, such as how the optical amplifier host computer control part specifically controls the control CPU module, how the reset circuit module specifically generates the reset signal, how the external DAC module specifically drives the pump driving circuit module, the specific composition and working principle of the hardware constant current source circuit, etc., are all prior art, do not belong to the improvement of the prior art by the present application, and do not belong to the protection scope of the technical scheme of the present application, therefore, they will not be described here.

[0048] Of course, the above content is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the embodiments of the present application. The present application is also not limited to the above examples, and equivalent changes and improvements made by ordinary skilled in the art within the essential scope of the present application should be attributed to the patent coverage scope of the present application.

Claims

1. An intersatellite optical amplifier control system for responding to abnormal CPU reset, characterized by: It includes an internal control part of the optical amplifier and an optical amplifier host computer control part; the internal control part of the optical amplifier includes a control CPU module, a reset circuit module, an external DAC module, a pump drive circuit module and a communication module, the reset circuit module and the external DAC module are respectively communicated with the control CPU module, the control CPU module is connected to the optical amplifier host computer control part through the communication module, and the external DAC module is electrically connected to the pump drive circuit module.

2. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 1, characterized in that: The internal control part of the optical amplifier further includes a hardware protection circuit module, and the hardware protection circuit module is electrically connected to the pump driving circuit module.

3. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 1, characterized in that: The reset circuit module includes an external watchdog circuit, and a reset output end of the external watchdog circuit is connected to the control CPU module.

4. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 1, characterized in that: The external DAC module includes a DAC chip, which is configured such that: after the power supply is established, the default output voltage of the DAC chip is 0V; after the control CPU module configures the DAC output voltage to the DAC chip, the DAC chip maintains the DAC output voltage until a new control instruction is received from the control CPU module or the power supply is cut off.

5. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 1, characterized in that: The pump driving circuit module includes a hardware constant current source circuit, which changes the operating current provided to the pump laser based on the DAC output voltage of the external DAC module.

6. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 1, characterized in that: The communication module includes a communication circuit, and the optical amplifier host computer control part obtains the operating status information of the optical amplifier and controls the laser output of the optical amplifier through the communication circuit.

7. The inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 2, characterized in that: The hardware protection circuit module includes a hardware comparator circuit, which outputs a pump shutdown signal to the pump driving circuit module without intervention of the control CPU module when there is no input light, the current exceeds a threshold, or the temperature exceeds a threshold in the optical amplifier.

8. A control method for an inter-satellite optical amplifier control system for responding to abnormal CPU reset, applying the inter-satellite optical amplifier control system for responding to abnormal CPU reset according to any one of claims 1 to 7, characterized in that: The steps include: Step S1: The power supply of the optical amplifier is turned on and each module is initialized; The default output voltage of the external DAC module is 0V, so that the operating current provided by the pump drive circuit module to the pump laser is 0A; the control CPU module communicates with the optical amplifier host computer control part in real time through the communication module; Step S2: The pump driving circuit module provides an operating current to the pump laser, so that the pump laser outputs laser light; Among them, after the control CPU module receives the laser output control instruction from the optical amplifier host computer control part, it configures the corresponding DAC output voltage to the external DAC module. The pump drive circuit module then provides the corresponding operating current to the pump laser based on the DAC output voltage; Step S3: After the control CPU module encounters an operation error or stops running, the reset circuit module sends a reset signal to the control CPU module to reset and restart it; Among them, after the control CPU module is reset and restarted, it will not automatically issue new control instructions to the external DAC module, so the external DAC module maintains the DAC output voltage configured before the control CPU module is reset and restarted; Step S4: The control part of the optical amplifier host computer re-controls the laser output of the optical amplifier; After the control CPU module is reset and restarted, the control CPU module reset and restart information is sent to the optical amplifier host computer control part through the communication module.

9. The control method of the inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 8, characterized in that: During the process of steps S1 to S4, the hardware protection circuit module monitors the status of the optical amplifier in real time and performs protection; when the optical amplifier has no input light, the current exceeds a threshold, or the temperature exceeds a threshold, the hardware protection circuit outputs a pump shutdown signal to the pump drive circuit module.

10. The control method of the inter-satellite optical amplifier control system for coping with abnormal CPU reset according to claim 8, characterized in that: In step S4, the control part of the optical amplifier host computer reissues the original laser output control instruction before the reset and restart or sends a new laser output control instruction to the control CPU module.

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