An airborne conversion device for asynchronous RS422 and synchronous RS422 communication access to optical fiber bus

Abstract

An airborne conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus relates to the field of communication technology. The invention solves the problem that large solar-powered unmanned aerial vehicles (UAVs) cannot realize optical fiber communication when using asynchronous RS422 interfaces and synchronous RS422 interfaces. The invention comprises a core processor, a global bus module and a local bus module; the core processor is respectively connected to the global bus module and the local bus module; the core processor comprises a DSP module, an FPGA module and an EMI bus; the EMIF bus is used to connect the DSP module and the FPGA module to realize data transmission between the DSP module and the FPGA module; the global bus module comprises an EMIF interface, and the global bus module is connected to the EMIF bus through the EMIF interface to realize optical fiber communication data transmission; the local bus module comprises asynchronous RS422 bus communication and synchronous RS422 bus communication; the asynchronous RS422 bus communication and the synchronous RS422 bus communication are respectively connected to the FPGA module to realize the transmission of asynchronous communication data and synchronous communication data. The invention is suitable for the communication of airborne data of UAVs.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to the field of unmanned aerial vehicle communication technology. Background Art

[0002] In large solar drones, with the rapid development of electronic technology, the requirements for buses are getting higher and higher. Compared with traditional buses, fiber-optic communication has the advantages of high transmission rate, large transmission distance, and good compatibility. Based on the above advantages, fiber-optic communication has gradually begun to be popularized in drone equipment. However, most large solar drones still use a large number of traditional buses, such as asynchronous RS422 interfaces and synchronous RS422 interfaces, which cannot achieve fiber-optic communication. In addition, the asynchronous RS422 interface and the synchronous RS422 interface have low transmission rate, short transmission distance, and poor compatibility. If all the asynchronous RS422 interfaces and synchronous RS422 interfaces of all airborne equipment are upgraded to fiber-optic interfaces, the existing airborne equipment with non-fiber-optic interfaces needs to be re-developed, the cost of revision and upgrade is very high, and the revision and upgrade cycle is long.

[0003] Therefore, there is an urgent need to provide an airborne conversion device to convert the synchronous RS422 interface and the asynchronous RS422 interface into a fiber optic interface, so that airborne devices with non-fiber optic interfaces can be directly connected to the fiber optic network, which can effectively reduce R&D costs and shorten the development cycle. Summary of the invention

[0004] The invention provides an airborne conversion device for accessing an asynchronous RS422 and a synchronous RS422 communication to an optical fiber bus, which solves the problem that the existing large solar-powered unmanned aerial vehicle uses an asynchronous RS422 interface and a synchronous RS422 interface but cannot realize optical fiber communication.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] An airborne conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus, the airborne conversion device comprising a core processor, a global bus module and a local bus module;

[0007] The core processor is connected to the global bus module and the local bus module respectively;

[0008] The core processor includes a DSP module, an FPGA module and an EMIF bus;

[0009] The EMIF bus is used to connect the DSP module and the FPGA module to realize data transmission between the DSP module and the FPGA module;

[0010] The global bus module includes an EMIF interface, and the global bus module is connected to the EMIF bus through the EMIF interface to implement optical fiber communication data transmission;

[0011] The local bus module includes asynchronous RS422 bus communication and synchronous RS422 bus communication;

[0012] The asynchronous RS422 bus communication is connected to the FPGA module to realize asynchronous communication data transmission;

[0013] The synchronous RS422 bus communication is connected to the FPGA module to realize synchronous communication data transmission.

[0014] Further, in a preferred embodiment, the DSP module includes a DSP core and an EMIF bus interface;

[0015] The DSP core is connected to the EMIF bus interface and is used for converting asynchronous RS422 communication data and synchronous RS422 communication data into optical fiber communication data.

[0016] Furthermore, in a preferred embodiment, the global bus module further includes a fiber optic protocol control module and an optical module;

[0017] The optical module is used to send and receive link signals to achieve the conversion of photoelectric signals;

[0018] The fiber optic protocol control module is connected to the optical module and the DSP module respectively, and is used to implement the analysis of the transmission protocol, and realize the data transmission between the fiber optic protocol control module and the DSP module through the EMIF interface.

[0019] Furthermore, in a preferred embodiment, the optical fiber protocol control module further includes a serial data transceiver circuit, a protocol analysis module, a storage circuit and an interface switching circuit;

[0020] The serial data transceiver circuit is connected to the optical module and is used to receive the link signal of the optical module;

[0021] The serial data transceiver circuit sends the received link signal to the protocol analysis module, and the protocol analysis module sends the link signal to the storage circuit for storing the link signal. The link signal is converted into an EMIF link signal by the interface switching circuit and sent to the DSP module through the EMIF interface.

[0022] Furthermore, in a preferred embodiment, the protocol parsing module includes a data transmission module and an instruction transmission module;

[0023] The data transmission module is used to send and receive data information;

[0024] The instruction transmission module is used to send and receive instruction information.

[0025] Furthermore, in another preferred embodiment, the storage circuit includes a register circuit and a data storage circuit;

[0026] The register circuit is a static storage circuit, used to store data information;

[0027] The data storage circuit is a dynamic storage circuit and can be connected to an SD card to realize the transfer of data information.

[0028] Further, there is also a preferred embodiment, the above-mentioned asynchronous RS422 bus communication includes an asynchronous RS422 isolation transceiver and an asynchronous RS422 serial logic unit;

[0029] The asynchronous RS422 serial logic unit is used to implement the analysis of the asynchronous communication protocol;

[0030] The asynchronous RS422 isolation transceiver is used to realize signal level conversion, and the asynchronous communication data transmission between the asynchronous RS422 isolation transceiver and the FPGA module is realized through the asynchronous RS422 serial logic unit.

[0031] Furthermore, in a preferred embodiment, the asynchronous RS422 isolation transceiver is implemented using an ADM2682E chip.

[0032] Further, there is also a preferred embodiment, the above-mentioned synchronous RS422 bus communication includes a synchronous RS422 isolation transceiver and a synchronous RS422 serial logic unit;

[0033] The synchronous RS422 serial logic unit is used to implement the parsing of the synchronous communication protocol;

[0034] The synchronous RS422 isolation transceiver is used to realize signal level conversion, and realize synchronous communication data transmission between the synchronous RS422 isolation transceiver and the FPGA module through the synchronous RS422 serial logic unit.

[0035] Furthermore, in a preferred embodiment, the synchronous RS422 isolation transceiver is implemented using an ADM2682E chip.

[0036] Technical Effects

[0037] The present invention provides an airborne conversion device for accessing an asynchronous RS422 and a synchronous RS422 communication to an optical fiber bus, which solves the problem that a large number of existing traditional unmanned aerial vehicles use asynchronous RS422 interfaces and synchronous RS422 interfaces but cannot realize optical fiber communication.

[0038] Compared with the existing technology, the following advantages are produced:

[0039] 1. Existing large-scale solar drones have begun to use fiber optic communications, and most of the existing airborne equipment has synchronous RS422 and asynchronous RS422 interfaces, which cannot access the communication network of the drone. If the asynchronous RS422 interfaces and synchronous RS422 interfaces of all airborne equipment are upgraded to fiber optic interfaces, the existing airborne equipment with non-fiber optic interfaces need to be re-developed, the cost of revision and upgrade is very high, and the revision and upgrade cycle is long. The present invention provides an airborne conversion device for asynchronous RS422 and synchronous RS422 communication access to the optical fiber bus, which can directly connect the airborne equipment with asynchronous RS422 interface and synchronous RS422 interface to the optical fiber network, realize the function of optical fiber communication, and solve the problem of upgrading the internal communication network of the drone at a relatively low cost.

[0040] 2. The present invention provides an airborne conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus. The global bus module and the local bus module are connected by a core processor to realize the conversion of the local bus module to the global bus module protocol data of the unmanned aerial vehicle flight control system. The core processor includes a DSP module and an FPGA module. The global bus module is integrated on the DSP module, and the local bus module is integrated on the FPGA module. The device has the advantages of fast transmission speed, small size and light weight.

[0041] 3. The present invention provides an airborne conversion device for accessing an optical fiber bus for asynchronous RS422 and synchronous RS422 communications. The optical fiber protocol control module is implemented by using the BK-SC1720ME chip, and has a data transmission function with high reliability and strong real-time performance. While having an EMIF interface, it can also have two interfaces, PCIE and SPI, and can realize data transmission with a variety of processors, which can meet a variety of application scenarios.

[0042] The present invention is suitable for the communication of airborne data of unmanned aerial vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is an electrical schematic diagram of an onboard conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus as described in embodiments one and two.

[0044] Figure 2 It is an electrical schematic diagram of the optical fiber protocol control module described in implementation modes three, four, five and six.

[0045] Figure 3 This is the electrical schematic diagram of the asynchronous RS422 communication interface described in Implementation Mode 7.

[0046] Figure 4This is the electrical schematic diagram of the synchronous RS422 communication interface described in Implementation Mode 9. Implementation

[0047] Implementation method 1. See Figure 1 This embodiment is described. This embodiment describes an onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus. The onboard conversion device includes a core processor, a global bus module, and a local bus module.

[0048] The core processor is connected to the global bus module and the local bus module respectively;

[0049] The core processor includes a DSP module, an FPGA module and an EMIF bus;

[0050] The EMIF bus is used to connect the DSP module and the FPGA module to realize data transmission between the DSP module and the FPGA module;

[0051] The global bus module includes an EMIF interface, and the global bus module is connected to the EMIF bus through the EMIF interface to implement optical fiber communication data transmission;

[0052] The local bus module includes asynchronous RS422 bus communication and synchronous RS422 bus communication;

[0053] The asynchronous RS422 bus communication is connected to the FPGA module to realize asynchronous communication data transmission;

[0054] The synchronous RS422 bus communication is connected to the FPGA module to realize synchronous communication data transmission.

[0055] The embodiment of the invention is an airborne conversion device for asynchronous RS422 and synchronous RS422 communication access to the optical fiber bus. The global bus module and the local bus module are connected through the core processor to realize the conversion of the local bus to the global bus protocol data of the UAV flight control system. The electrical schematic diagram is shown in FIG. Figure 1As shown, the core processor includes a DSP module, an FPGA module and an EMIF bus, and the data transmission between the DSP module and the FPGA module is realized through the EMIF bus. The global bus module includes an EMIF interface, and the global bus module is connected to the EMIF bus through the EMIF interface, and then connected to the DSP module to realize optical fiber communication data transmission; the local bus module includes asynchronous RS422 bus communication and synchronous RS422 bus communication, and the asynchronous RS422 bus communication is connected to the FPGA module to realize asynchronous communication data transmission, and the synchronous RS422 bus communication is connected to the FPGA module to realize synchronous communication data transmission. The local bus module is implemented in the FPGA module, which has the advantages of small size and light weight. In actual application, the DSP module is implemented using the FT-M6678N chip, and the FPGA module is implemented using the SMQ7K325T chip, which has the advantages of integration, small size and light weight.

[0056] Existing large-scale solar drones have begun to use optical fiber communications, and most of the existing airborne equipment has synchronous RS422 and asynchronous RS422 interfaces, which cannot access the communication network of the drone. If the asynchronous RS422 interfaces and synchronous RS422 interfaces of all airborne equipment are upgraded to optical fiber interfaces, the existing airborne equipment with non-optical fiber interfaces need to be re-developed, the cost of revision and upgrade is very high, and the revision and upgrade cycle is long. The present invention provides an airborne conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus, which can directly connect airborne equipment with asynchronous RS422 interfaces and synchronous RS422 interfaces to an optical fiber network, realize the function of optical fiber communication, and solve the problem of upgrading the internal communication network of the drone at a relatively low cost.

[0057] Implementation method 2. See Figure 1 This embodiment is described. This embodiment is an example of a DSP module in an onboard conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus as described in Embodiment 1. The DSP module includes a DSP core and an EMIF bus interface.

[0058] The DSP core is connected to the EMIF bus interface and is used for converting asynchronous RS422 communication data and synchronous RS422 communication data into optical fiber communication data.

[0059] In actual application of this embodiment, the DSP core is connected to the EMIF bus interface to parse and convert the asynchronous RS422 communication data and the synchronous RS422 communication data into optical fiber communication data.

[0060] Implementation method 3. See Figure 2This embodiment is described as follows: This embodiment is an example of a global bus module in an onboard conversion device for accessing an asynchronous RS422 and a synchronous RS422 communication to an optical fiber bus as described in Embodiment 1, wherein the global bus module further includes an optical fiber protocol control module and an optical module;

[0061] The optical module is used to send and receive link signals to achieve the conversion of photoelectric signals;

[0062] The fiber optic protocol control module is connected to the optical module and the DSP module respectively, and is used to implement the analysis of the transmission protocol, and realize the data transmission between the fiber optic protocol control module and the DSP module through the EMIF interface.

[0063] In actual application of this embodiment, the fiber optic protocol control module is connected to the optical module and the DSP module respectively to implement the analysis of the transmission protocol, and realizes data transmission between the fiber optic protocol control module and the DSP module through the EMIF interface.

[0064] Implementation method 4. See Figure 2 This embodiment is described. This embodiment is an example of a fiber optic protocol control module in an airborne conversion device for accessing an optical fiber bus by asynchronous RS422 and synchronous RS422 communication as described in Embodiment 3. The fiber optic protocol control module also includes a serial data transceiver circuit, a protocol parsing module, a storage circuit and an interface switching circuit;

[0065] The serial data transceiver circuit is connected to the optical module and is used to receive the link signal of the optical module;

[0066] The serial data transceiver circuit sends the received link signal to the protocol analysis module, and the protocol analysis module sends the link signal to the storage circuit for storing the link signal. The link signal is converted into an EMIF link signal by the interface switching circuit and sent to the DSP module through the EMIF interface.

[0067] In actual application of this embodiment, the serial data transceiver circuit receives the link signal of the optical module, sends the link signal to the storage circuit for storage, and sends it to the interface switching circuit for conversion. The converted link signal is sent to the DSP module through the EMIF interface.

[0068] like Figure 2 In actual application, the fiber optic protocol control module is implemented with the BK-SC1720ME chip, which has high reliability and strong real-time data transmission function. In addition to the EMIF interface, it also has two interfaces, PCIE and SPI, which can realize data transmission with a variety of processors and meet a variety of application scenarios.

[0069] Implementation method 5. See Figure 2 This embodiment is described as follows: This embodiment is an example of a protocol parsing module in an onboard conversion device for accessing an asynchronous RS422 and a synchronous RS422 communication to an optical fiber bus as described in Embodiment 4, wherein the protocol parsing module includes a data transmission module and an instruction transmission module;

[0070] The data transmission module is used to send and receive data information;

[0071] The instruction transmission module is used to send and receive instruction information.

[0072] In actual application, the data transmission module is used to send and receive data information; the instruction transmission module is used to send and receive instruction information, and has a data transmission function with high reliability and strong real-time performance.

[0073] Implementation method 6. See Figure 2 This embodiment is described. This embodiment is an example of a storage circuit in an onboard conversion device for accessing an asynchronous RS422 and synchronous RS422 communication optical fiber bus described in Embodiment 4. The storage circuit includes a register circuit and a data storage circuit.

[0074] The register circuit is a static storage circuit, used to store data information;

[0075] The data storage circuit is a dynamic storage circuit and can be connected to an SD card to realize the transfer of data information.

[0076] In practical applications, the register circuit of this embodiment is a static storage circuit for storing data information, and has a data transmission function with high reliability and strong real-time performance;

[0077] The data storage circuit is a dynamic storage circuit that can be connected to an external SD card or mobile hard disk to achieve the transfer of data information.

[0078] Implementation method 7. See Figure 3 This embodiment is described. This embodiment is an example of an asynchronous RS422 bus communication in an onboard conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus as described in Embodiment 1. The asynchronous RS422 bus communication includes an asynchronous RS422 isolation transceiver and an asynchronous RS422 serial logic unit.

[0079] The asynchronous RS422 serial logic unit is used to implement the analysis of the asynchronous communication protocol;

[0080] The asynchronous RS422 isolation transceiver is used to realize signal level conversion, and the asynchronous communication data transmission between the asynchronous RS422 isolation transceiver and the FPGA module is realized through the asynchronous RS422 serial logic unit.

[0081] In actual application, the asynchronous RS422 bus communication exchanges information with the external inertial navigation, navigation parameters, atmospheric machine and differential GPS terminal. The asynchronous RS422 serial logic unit is implemented by SMQ7K325T, which mainly sets the communication baud rate, frame format, etc.

[0082] Implementation eight. This implementation is an example of an asynchronous RS422 isolation transceiver in an onboard conversion device for accessing an optical fiber bus for asynchronous RS422 and synchronous RS422 communications described in Implementation Seven. The asynchronous RS422 isolation transceiver is implemented using an ADM2682E chip.

[0083] In actual application, the asynchronous RS422 isolation transceiver of this embodiment is implemented using the ADM2682E chip, which is powered by 5V / 3.3V and integrates an isolated DC-DC converter, a 3-channel isolator and a three-state differential line driver. The data rate can reach 16Mbps, and the transmission rate is high.

[0084] Implementation method 9. See Figure 4 This embodiment is described. This embodiment is an example of a synchronous RS422 bus communication in an onboard conversion device for accessing an asynchronous RS422 and synchronous RS422 communication to an optical fiber bus as described in Embodiment 1. The synchronous RS422 bus communication includes a synchronous RS422 isolation transceiver and a synchronous RS422 serial logic unit;

[0085] The synchronous RS422 serial logic unit is used to implement the parsing of the synchronous communication protocol;

[0086] The synchronous RS422 isolation transceiver is used to realize signal level conversion, and realize synchronous communication data transmission between the synchronous RS422 isolation transceiver and the FPGA module through the synchronous RS422 serial logic unit.

[0087] In actual application of this embodiment, information exchange between the onboard conversion device and the external radio terminal is realized by synchronous RS422 bus communication. The synchronous RS422 serial logic unit is implemented by SMQ7K325T, which mainly sets the communication baud rate, frame format, etc.

[0088] Implementation method ten. This implementation method is an example of a synchronous RS422 isolation transceiver in an airborne conversion device for accessing an asynchronous RS422 and synchronous RS422 communication optical fiber bus as described in implementation method nine. The synchronous RS422 isolation transceiver is implemented using an ADM2682E chip, which is powered by 5V / 3.3V and integrates an isolated DC-DC converter, a 3-channel isolator and a three-state differential line driver. The data rate can reach 16Mbps, and the transmission rate is high.

[0089] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to a fiber optic bus, It is characterized in that The onboard conversion device includes a core processor, a global bus module and a local bus module; The core processor is connected to the global bus module and the local bus module respectively; The core processor includes a DSP module, an FPGA module and an EMIF bus; The EMIF bus is used to connect the DSP module and the FPGA module to realize data transmission between the DSP module and the FPGA module; The DSP module includes a DSP core and an EMIF bus interface; The DSP core is connected to the EMIF bus interface and is used for converting asynchronous RS422 communication data and synchronous RS422 communication data into optical fiber communication data; The global bus module includes an EMIF interface, and the global bus module is connected to the EMIF bus through the EMIF interface to implement optical fiber communication data transmission; The global bus module also includes a fiber optic protocol control module and an optical module; The optical module is used to send and receive link signals to achieve the conversion of photoelectric signals; The fiber optic protocol control module is connected to the optical module to implement the analysis of the transmission protocol and realize the data transmission between the fiber optic protocol control module and the DSP module through the EMIF interface; The optical fiber protocol control module also includes a serial data transceiver circuit, a protocol analysis module, a storage circuit and an interface switching circuit; The serial data transceiver circuit is connected to the optical module and is used to receive the link signal of the optical module; The serial data transceiver circuit sends the received link signal to the protocol analysis module, the protocol analysis module sends the link signal to the storage circuit for storing the link signal, the link signal is converted into an EMIF link signal by the interface switching circuit, and sent to the DSP module through the EMIF interface; The local bus module includes asynchronous RS422 bus communication and synchronous RS422 bus communication; The asynchronous RS422 bus communication is connected to the FPGA module to realize asynchronous communication data transmission; The synchronous RS422 bus communication is connected to the FPGA module to realize synchronous communication data transmission.

2. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to a fiber optic bus according to claim 1, It is characterized in that The protocol analysis module includes a data transmission module and an instruction transmission module; The data transmission module is used to send and receive data information; The instruction transmission module is used to send and receive instruction information.

3. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to a fiber optic bus according to claim 1, It is characterized in that The storage circuit includes a register circuit and a data storage circuit; The register circuit is a static storage circuit, used to store data information; The data storage circuit is a dynamic storage circuit and can be connected to an SD card to realize the transfer of data information.

4. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to a fiber optic bus according to claim 1, It is characterized in that Described asynchronous RS422 bus communication comprises asynchronous RS422 isolation transceiver and asynchronous RS422 serial logic unit; The asynchronous RS422 serial logic unit is used to implement the parsing of the asynchronous communication protocol; The asynchronous RS422 isolation transceiver is used to realize signal level conversion, and the asynchronous communication data transmission between the asynchronous RS422 isolation transceiver and the FPGA module is realized through the asynchronous RS422 serial logic unit.

5. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus according to claim 4, It is characterized in that The asynchronous RS422 isolation transceiver is implemented using the ADM2682E chip.

6. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus according to claim 1, It is characterized in that The synchronous RS422 bus communication comprises a synchronous RS422 isolation transceiver and a synchronous RS422 serial logic unit; The synchronous RS422 serial logic unit is used to implement the parsing of the synchronous communication protocol; The synchronous RS422 isolation transceiver is used to realize signal level conversion, and realize synchronous communication data transmission between the synchronous RS422 isolation transceiver and the FPGA module through the synchronous RS422 serial logic unit.

7. An onboard conversion device for asynchronous RS422 and synchronous RS422 communication access to an optical fiber bus according to claim 6, It is characterized in that The synchronous RS422 isolation transceiver is implemented using the ADM2682E chip.

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